bluuebunny/crossref_metadata_2025 huggingface dataset:
Study of Effect of Water on the Physicochemical Properties of 1-Buthyl-3-Methylimidazolium Chloride Ionic Liquids
Authors: Tian Guo Cai , Feng Han Kun , Zhang Jin Liang
Published: July 2012

The density, viscosity, conductivity and the electrochemical window of 1-buthyl-3-methyl- imidazolium Chloride ionic liquids([Bmim]Cl) and its water mixture have been determined at 298.15 K and atmospheric pressure. It was found that the density and conductivity of [Bmim]Cl/water, increase with the increase the water concentration at the same temperature, whereas the viscosity and electrochemical windows of [Bmim]Cl/water decrease. The viscosity of pure ionic liquids decreases with the increase of the temperature, whereas the conductivity increases. The relationship between the conductivity and the temperature agrees well with the Arrhenius equation k=k∞exp[-Ea/kBT] and the active energy of conduction is determined accordingly.
Synthesis of M-Toluidine-Aniline Chirality Copolymers Induced by D-Camphorsulfonic Acid
Authors: Yan Hai Yan , Kou Kai Chang
Published: July 2012

The copolymerization reaction of m-toluidine and aniline has been induced by D-camphorsulfonic acid. When the total concentrations of the acid, the oxidant and the monomer were maintained, the ratio of two types of monomers was varied to realize the structure and property control of m-toluidine-aniline copolymers. FTIR, UV-Vis, CD and SEM were utilized to characterize the products. The results showed that the synthesized copolymers were of fiber and tube structure with the diameter of approximately 70 nm. The introduction of methyl moiety in the molecular chain of benzene weakened the conjugation and blue shifts were observed in both FTIR and UV-Vis spectra. Besides, CD spectra verified the chirality of the copolymers. Negative cotton effect could be discerned at 400 nm and the chirality inversed when [m-An]/[An]=1:5.
The Preparation of Solvent-Free Polyurethane Laminating Adhesive with Mixed-Polyols
Authors: Chen Shuang Lian , Chen Guang Xue , Chen Qi Feng , Jia Chun Jiang , Wang Qin
Published: July 2012

A two-component polyurethane adhesive based on solvent-free was prepared with PBA, vegetable oil polyols, IPDI and several different small molecular polyols as main raw materials. The influences of different mole ratios of NCO groups (from prepolymer )and OH groups (from the mixed polyols) on water absorbing capacity and T-style peeling strength were studied, as well as the effects of small molecular polyols on curing speed, heat resistance, water absorbing capacity and T-style peeling strength. The results showed that PU adhesive performed the best when mole ratio of NCO/OH was 1.3 in this experiment. And small molecular polyols added to the adhesives can not increase the curing speed and the ability of heat resistance. However, it could significantly improve the adhesion strength of PU adhesive, and adding appropriate amount of small molecular polyols selectively could improve its water resistance.
Activation of Corn Starch and Effect of the Activation on its Reactivity
Authors: Wang Yan , Xin Jia Ying , Liu Tie , Lin Kai , Zhang Chao Yue , Xia Chun Gu
Published: July 2012

Native corn starch (NS) was activated by treatment with NaOH /Urea /H2O solution at low temperature to improve its chemical reactivity. Effects of the activation on the molecular level structure and morphology of the corn starch were investigated by mean of SEM. It was found that the average particle size of activated corn starch (AS) decreased to nanometer level, smaller than those of NS. The cold water solubility (CWS) has been increased from 0.45% to 96.4%. Effects of the activation on reactivity of the corn starches were investigated by analyzing the influences of the activation on degrees of substitutions (DS) of the esterifications. The DS of AS was higher than that of NS, from 0 to 0.1578, which indicated that NaOH/urea activation enhanced the chemical reaction activity of corn starch.
Simultaneous Determination of Trace Antimony and Bismuth in Jilin Ginseng with Microwave Digestion Hydride Generation Atomic Fluorescence Spectrometry
Authors: Guo Shu Ying , Ji Zheng Jia , Feng Bo , Bian Jiang
Published: July 2012

A robust, accurate and sensitive analytical procedure was developed for the simultaneous determination of trace Antimony and Bismuth in Jilin ginseng by hydride generation atomic fluorescence spectrometry. The parameters were studied systematically, such as acid concentration of the reaction medium, flow rate of the carrier gas and shield gas, the atomizer of height, etc. Ascorbic acid and thiourea were used as reducer or masking agents to enhance the generation efficiency of the volatile species of Sb and Bi. In the presence of thiourea and ascorbic acid, the influences of some coexisting elements on the determination of antimony and bismuth were investigated.
Structure and Thermo-Chemical Stability of Sr-Fe-Co-O Mixed Metal Oxides
Authors: Huang Xiang Hong , Qiao Jun , Zhang Qian Feng
Published: July 2012

SrFexCo0.5Oδ(x=0.5, 0.75, 1.0, 1.25) mixed metal oxides were synthesized by the citrate method. The structure and thermo-chemical stability of the obtained SrFexCo0.5Oδpowders were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD results show that the SrFexCo0.5Oδpowders are composed of perovskite-type cubic structure at both room temperature and high temperature. The crystalline phases of the SrFexCo0.5Oδpowders are dependent on the content of Fe and SrFe0.5Co0.5O3, SrFe0.19Co081O2.78are the main crystalline phases. The powders have good thermo-chemical stability at elevated temperatures in helium, which is confirmed by an in-situ high-temperature X-ray diffraction. The SEM images show that the product of the SrFexCo0.5Oδ(x=0.5, 1.0) is composed of single grain, while other two samples consist of layer structures and some open porosities.
Synthesis and Evaluation of Starch Graft Copolymer Applied as Dispersant in Coal-Water Slurry
Authors: Li Jun Guo , Zhao Fang , Zhang Guang Hua , Zhu Jun Feng , Liu Long
Published: July 2012

In this paper, a starch-based dispersant for Chinese Shenhua coal-water slurry (CWS) was synthesized by radical polymerization using styrene sulfonate and acrylic acid as graft monomers in oxidation-reduction initiator system. Chemical structure and thermal performance of the copolymer were investigated by Fourier Transform Infrared Spectrum (FT-IR) and Thermogravimetric Analyzer (TGA). The rheological characteristics of the slurry were studied by varying dispersant dosage and shear rate，and the results show, At coal concentration of 66 wt%, dispersant dosage of 0.4 wt% and shear rate of 100 s-1, the CWS gives the minimum viscosity of 848 mPa•s. Bleeding ratio tests indicate the dispersant can stabilize the slurry. Based on the above, the starch-based dispersant has due structure and a bright prospect for the application for CWS.
A Novel Amphiphilic Polymer Prepared by the Ring-Opening Copolymerization from Hydroxyethylcellulose and Poly(ρ-Dioxanone) in Ionic Liquid
Authors: Zhu Jiang , Wang Xiu Li
Published: July 2012

A new amphiphilic copolymer of hydroxyethyl cellulose and poly(p-dioxanone) (PPDO) was prepared through the ring-opening copolymerization in IL 1-N-butyl-3-methylimidazolium chloride ([Bmim]Cl). The resulting products were thoroughly characterized with FT-IR,1H-NMR and TG. The copolymer is hopeful for the use as tissue engineering materials and the ionic liquid as the reaction media can be easily recycled and reused
Study of Methylene Blue Adsorption on Mesoporus Molecular Sieve from Aqueous Solution
Authors: An Qun Li
Published: July 2012

The adsorption of methylene blue (MB) from an aqueous solution by MCM-41 was investigated. It was found that the adsorption of MB on MCM-41 could be described by Freundlich isotherm and second-order kinetic model. The adsorbed amount of MB on MCM-41 reached to 24.5 mg g-1 within 30 min.
Study on High Temperature Corrosion of Alloy 600 in NaOH Solution
Authors: Li Yu Chun , Zhang Rui Feng , Yuan Cao Long , Yu Fei
Published: July 2012

Alloy 600 was studied from three aspects including corrosion behaviour experiment in high temperature, metallurgy element dissolving experiment and water chemistry optimization analysis. Experimental results showed that there was not obvious corrosion velocity for Alloy 600 in local concentrated NaOH solution; high ratio of iron dissolving concentration was found after high P,T experiment, which indicated that Alloy 600 experienced de-alloy corrosion in localized concentrated environment.
Preparation and Characterization of Water-Soluble CdSe/CdS Core/Shell Quantum Dots
Authors: Li Ming Li , Yu Qiong , Xu Ying , Zhou Chun Jiang , Lu Qing Guo
Published: July 2012

Cadmium Selenide/Cadmium Sulfide (CdSe/CdS) core/shell quantum dots (QDs) in aqueous solution were prepared by solve-separate method using CdSe as core and mercapto-acetate acid as stabilizer and surfactants. The results of experiments indicate that the size of the CdSe/CdS QDs was about 5nm estimated by FE-TEM, which is accordant with that calculated from the XRD data by the Scherer equation after emendation. The QDs belong to the cubic structure (zinc blende) by XRD analysis. The intensity of luminescence of the quantum dots was greatly improved after the surface was coated with CdS shell. With increasing the time of refluence, the intensity of photoluminescence was promoted correspondingly. The excitation wavelength was 350nm, two emission peaks were clearly observed, the first high-energy peak was at 600nm and the second one located in 700nm. The first high-energy band was attributed to electron–hole recombination after relaxation and the second energy band was to deep traps in quantum-confined systems.
Synthesis of Metal Core in the Apoferritin Cavity
Authors: Wang Ting
Published: July 2012

Many methods to produce NPs have been studied. Among them, the molecular level understanding of the formation of solids in biological systems has provided inspiration for the controlled formation of novel inorganic materials. The use of a protein cavity as the growth field of NPs provides one candidate method for obtaining uniform particle size. The host-guest relationship between these protein cages and the encapsulated material is based primarily on a complementary electrostatic interaction. Charged interfaces play important roles in defining electrostatically distinct environments for spatially defined encapsulation. The electrostatic interactions can be approximated by Guoy-Chapman theory of charged interfaces. These interactions are proposed at the interior of protein cages such as ferritin and viruses. The protein cage with a highly charged interior surface with pores that allow molecular access to the inside of the protein could act as a constrained reaction vessel. The present paper will focus on the synthesis of Metal NPs using ferritin.
Iodide Selective Electrode Based on Cobalt(II) Complex with Dual-Core Schif Base as Neutral Carrier
Authors: Xu Gang , Dong Wen Li , Ren Ling Yan
Published: July 2012

A new highly selective poly vinyl chloride(PVC) membrane iodide electrode which has neutral carrier of cobalt(Ⅱ) complex with symmetrical binuclear schiff base has been studied. Based on the fact we knew that ethylenediamine could react to acetylacetone and salicylaldehyde. The electrode exhibited near -Nernst response to iodide with a slope of ―54.4 mV/dec over a wide concentration range (1.58×10-7~1.0×10-1 mol/L) with a detection limit of 6.3×10-8 mol/L in phosphorate bufer solution with pH=2.4 at 26°C. After applied to the determination of iodide in pharmaceuticals and salts, the electrode could get satisfied results
A New Method of Separating and Refining β-Methylnaphthalene from Wash Oil
Authors: E Yong Sheng , Sun Xiao Dan
Published: July 2012

This paper introduces the current technology of separating and refining β-methylnaphthalene from wash oil. On this basis, I propose a new production method of β-methylnaphthalene after many experiments. Industrial methylnaphthalene is washed twice with sulfuric acid and is distilled once. The content of β-methylnaphthalene is higher than 96%.The yield is 60%, which is higher than current domestic production levels.
A Highly Selective and Sensitive Fluorescent Probe Based on Quinolone Derivative for Hg2+ in Aqueous Solution
Authors: Tian Juan Juan , Zhou Xin , Hao Hui Juan , Wu Xue
Published: July 2012

A new fluorescent probe, quinoline derivative DPQ bearing a methyl pyrrolidine-1-carbodithioate group, was synthesized and characterized by IR, Tof-MS and NMR. Its fluorescent behaviors toward transition metal ions were investigated. The results indicate that DPQ shows unique selective and high sensitive for Hg2+ in aqueous solution with a broad pH range 4-10. DPQ forms a 1:2 metal-ligand complex with Hg2+ ions with a limit of detection as low as 1.7×10-6 mol/L.
Fabrication of a New Type Modified Attapulgite and its Best Adsorption Conditions of Cu2+ Ion
Authors: Jiang Ding Yun , Shi Ying Ying , Feng Liang Dong , Tang Ru Miao
Published: July 2012

A new method is proposed to treat attapulgite by freeze-dying and heating process. The treated attapulgite presents good adsorption properties. The best adsorption conditions were studied by a series of tests on attapulgite’s adsorption on Cu2+ ion. The photos of Scanning Electron Microscopy (SEM) on treated attapulgite show the higher dispersion property, and the IR spectroscopy of treated attapulgite exhibits the lessening of adsorption water, zeolite water and coordinate water contents. At room temperature, the best adsorption conditions are pH = 4±0.2 and the solid to liquid ratio is about 3 g/L. After 40 min, the adsorption experiments achieved balance status, the most adsorption mass is about 39.43 mg/g.
Nonthermal Plasma Hybrid Technology for VOCs Decomposition
Authors: Zhu Tao , Wan Yan Dong , Liu Yu Jie , Yuan Yu , Li Hai Rong , Chen Sha , Zhou Jin Lan
Published: July 2012

Because of its wide pollution, large flow and low concentration, the waste gas containing volatile organic compound (VOCs) will be controlled more strictly on its emission, and new technologies for its treatment must be developed continuously. As an emerging technology for environmental protection, non-thermal plasma (NTP) has been subjected to extensive researches over the past 20 years. In the field of air pollution control, the NTP technology has been used for the abatement of various types of hazardous air pollutants due to its unique properties including the moderate operation conditions (normal temperature and atmospheric pressure), moderate capital cost, compact system, easy operations and short residence times, compared to the conventional technologies. Especially, combined plasma technology has multi-function effects, better pollutant degradation efficiency, better energy utilization efficiency and higher pollutant selectivity than single plasma technology. The research progresses in treatment of waste gas containing VOCs and the patents application by plasma technology combined with adsorbent, catalyst and ferroelectric are summarized and analyzed. From the review, we can come to a conclusion the synergistic technology result in greater enhancement of VOCs decomposition and energy efficiency. The development direction of combined plasma technology is prospected.
Research Progress on Preparation and Modification of Polyvinylidene Fluoride Membrane
Authors: Zhang Ying Jie , Yuan Ming Yuan , Lin Ru
Published: July 2012

Immersion precipitation is one of the commonly used methods in preparing polyvinylidene fluoride membrane (PVDF) membrane. Using this method, the membrane structure is easily controlled and the operation is very simple. This paper summarized the mechanism and preparation methods of PVDF as well as researching the effects of membrane-forming factors such as ingredient of solvents and non-solvents, temperature and additives etc. on the structure and function of PVDF membrane. Applying modification on PVDF membrane can improve its hydrophilicity and anti-fouling properties, of which blending modification is expected to be a hotspot of study in future. Adding catalytic agent into PVDF can generate catalytic membrane, which offers a researching direction for preparing multi-functional PVDF membrane. Finally, brief comments are made on the improvement of membrane pore structure and problem of singleness of blending materials.
Influence of Polyols as a Co-Stabilizer on Stabilization Efficiency of Calcium/Zinc Stabilizers to PVC
Authors: Gao Jun Gang , Liu Xiao Qian , Yang Jiang Bo , Zhu Feng Li
Published: July 2012

In order to prepare the innocuity polyvinyl chloride (PVC) products, the calcium/zinc stearate was used as the thermal stabilizer of PVC and the polyols were used as co-stabilizer of Ca/Zn stabilizer. The influence of polyols on the stabilization efficiency of Ca/Zn stabilizer to PVC was investigated by Congo red methods. The rheological behaviors and dynamic mechanical properties of PVC were also investigated by rotational rheometer and dynamic mechanical analyzer (DMA). The results showed that different polyols have different influences on the stability, but the pentaerythritol has a good synergy effect with Ca/Zn stabilizer for PVC and pentaerythritol and dipentaerythritol have a lower melt viscosity and good product color.
Influence of Cellulase to Aggregation Structure of Bleached Softwood Pulp
Authors: Du Min , Li Xin Ping , Yao Zhi Min
Published: July 2012

Cellulase named as Celluclast 1.5L was used to deal with bleached softwood pulp. By analyzing the changes of water retention value and crystallinity of fiber after enzymatic treatment, studied the influence of cellulase to aggregation structure of bleached softwood pulp. The results show that with the increasing of the enzyme dosage, the proportion of long-fiber decreases and the content of fines increases. Water retention value of pulp first decreases and then increases. The fiber crystal does not change with the enzymatic treatment, but with the increasing of the enzyme dosage, the crystallinity of fiber first increases and then decreases. It indicates that the cellulase would act on the crystalline region of fiber in the higher enzyme dosage.
Effect of Neutral Xylanase Pretreatment on ECF Bleaching of KP Bamboo Pulp with Low Kappa Number
Authors: Li Jin Bao , Zhang Mei Yun , Xia Xin Xing , Liu Yi Juan
Published: July 2012

At present, most of the studies of Xylanase auxiliary bleaching focused on in the alkaline or acid conditions. It was investigated in this paper that Neutral Xylanase had been used to pretreat the oxygen delignified KP bamboo pulp with low kappa number. The effect of Xylanase on the follow-up ECF bleaching was discussed, especially highlighting the principle of the residual lignin removal and improvement of pulp’s brightness. Results showed that the effect of neutral xylanase pretreatment on ECF bleaching of KP bamboo pulp was obvious. The pulp with a higher brightness and brightness stability could be obtained in this way. The optimum charge of xylanase is 0.6IU•g-1, and The brightness of the bleached pulp could reach 87.8%ISO, the color reversion value 0.016, viscosity 764mL•g-1. It was 2.9%ISO higher in brightness, 59mL•g-1 higher in viscosity, but the color reversion value is only 30.2% of the later, compared to the pulp without xylanase pretreatment.
Synthesis, Characterization of the Mn(II) Complex of Rutin and Interactions between the Complex and Serum Albumins
Authors: Li Hong Xia , Wang Kun Jie , Zhang De Yi , Wu Yan Ping , Feng Hui Xia , Wang Yi , Song Yu Min
Published: July 2012

In this work, the complex of rutin-Mn has been synthesized. On the basis of elemental, thermogravimetric analyses, IR, the general formula of this complex, Na3Mn2•L(HCO3)3•3H2O is given. The interaction of serum albumin (BSA and HSA) with this complex has been studied by fluorescence method and the binding constants K (rutin-Mn-BSA: 3.1×108, 8.7×105; rutin-Mn-HSA: 3.3×107, 2.7×105) and the number of binding sites (rutin-Mn-BSA: 1.8, 1.2; rutin-Mn-HSA: 1.6, 1.1) has been obtained.
Synthesis of 5,10,15-Tris(4-nitrophenyl)-20-hydroxylphenylporphyrin and its Spectrum Study
Authors: Fa Huan Bao , Qi Hui , Yin Wei , Huo Dan Qun , Hou Chang Jun
Published: July 2012

5,10,15-Tris(4-nitrophenyl)-20-hydroxylphenylporph-yrin was synthesized by a novel method which was for the nitration of the phenyl groups of 5-(4-hydroxylphenyl)-10,15,20- triphenylporphyin(MHTPP) using NaNO2 and trifluoroacetic acid(TFA) and characterized using mass spectrometry, NMR spectroscopy, UV-visible, IR spectrometry. The mild reaction conditions produced higher yields and minimum macrocyclic degradation. Its fluorescence spectra was studied compared with MHTPP and tetraphenylporphyrin(TPP). The results showed that the absorption and emission bands of the product experienced red shifts and the fluorescence intensity weakened compared with MHTPP and TPP.
Adsorption Kinetics of Reactive Dyes on Silk with Octyl Butyl Dimethyl Ammonium Bromide as Accelerant
Authors: Chen Cheng , Zhang Guang Xian , Zhang Feng Xiu , Zheng Hui
Published: July 2012

With octyl butyl dimethyl ammonium bromide (OBDAB) as accelerant, adsorption kinetics of dyeing silk with three reactive dyes was studied in this paper. As concentration of OBDAB increased, the dye-uptake rate increased. The highest dye-uptake rates of three reactive dyes could reach to 89.40%~98.98% and the concentration of OBDAB was only 6-8g/L. This showed OBDAB was an effective accelerant. Pseudo first- and second-order kinetic models were used to analyze the adsorption kinetic data. The experimental data were found to follow the second-order kinetic model. Meanwhile, the initial dye adsorption rates of reactive red dye B-3BF, reactive yellow dye B-4RFN and reactive orange dye B-2RLN increased as temperature increased, and the activation energy of them were found respectively to be 28.42,13.14,32.90 kJ/mol.The positive values of and obtained indicated that reactive dyes adsorption with OBDAB as accelerant was an endothermic process. The conclusion showed OBDAB was a potential accelerant.
Solid-Solid Reaction Preparation for Nanoparticles of Bioinorganic Complex of Bismuth and Serine at Room Temperature
Authors: Zhong Guo Qing , Jia Rong Rong , Jia Yu Qing
Published: July 2012

Nanoparticles of the bioinorganic complex of bismuth and serine can be prepared very easily by a room temperature solid-solid reaction with the raw materials of bismuth triiodide and serine. The complex is characterized by elemental analysis, X-ray powder diffraction and transmission electron micrograph. The characterizations indicate that the composition of the complex is Bi[I(HOCH2CHNH2COO)]1.5. The crystal structure of the complex belongs to orthorhombic system with the lattice parameters: a = 0.8355 nm, b = 1.8688 nm and c = 2.2511 nm. The average diameter of the bioinorganic complex nanoparticles is about 40 nm.
Hydrogenolysis of Glycerol on Supported Ru-Co Bimetallic Catalysts
Authors: Feng Jian , Xu Bin , Jiang Wei Dong , Xiong Wei , Wang Jin Bo
Published: July 2012

The hydrogenolysis of biomass-derived glycerol was studied on Ru-Co bimetallic catalysts, including Ru-Co/TiO2, Ru-Co/ZrO2, Ru-Co/SiO2 and Ru-Co/γ-Al2O3. The addition of Co to the Ru-based catalysts can promote the selectivity to 1,2-propanediol (1,2-PDO). The support material and Ru/Co atomic ratio has a significant effect on the catalytic performance. Ru-Co/ZrO2 exhibited the best performance as regard to both the activity and the selectivity to 1,2-PDO. Co is a promising second metal component to adjust the catalytic properties of Ru-based catalysts for the selective hydrogenolysis of glycerol.
Synthesis and Properties of Cellulose Diacetate Graft Poly(p-dioxanone) Copolymers via the Couple-Grafting Copolymerization
Authors: Zhu Jiang , Wang Xiu Li
Published: July 2012

A new biodegradable copolymer of cellulose diacetate and poly(p-dioxanone) (PPDO) was prepared through a couple-grafting procedure. PPDO was functionalized with the isocyanate group, and then PPDO terminated with the isocyanate group was enabled to react with the hydroxyl groups of cellulose diacetate. The length of PPDO graft chains can be controlled easily by using the prepolymers of PPDO with different molecular weights. The resulting products were thoroughly characterized with FT-IR,1H-NMR. The mechanical properties of the copolymers were affected greatly by the length of PPDO segment.
Liquid-Liquid Equilibria for Acetone + Several Citrates Aqueous Two-Phase Systems at Different Temperatures
Authors: Hu Shi Ping , Han Juan , Yan Yong Sheng , Hu Yu Tao
Published: July 2012

Liquid-liquid equilibria for the three kinds of the ternary systems acetone + ammonium, sodium or potassium citrate + water have been determined at T= (273.15, 283.15, and 298.15) K. Binodal curves, tie-lines, and integrated phase diagrams for the ternary systems are given. The data of the experimental bimodal curve are described with a four-parameter equation. The result also shows the temperature has little influence on the liquid-liquid equilibrium within the investigated range. The tie-line data calculated according to the bimodal data fitting equation and the lever arm rule were satisfactorily described by using the Othmer-Tobias and Bancroft equations, and the result conform the reliability of the calculation method and corresponding tie-line data.
Peroxyl Radical Scavenging Ability of Fifty Kinds of Chinese Medicines Determined by an ESR Spin-Trapping Technique
Authors: Wang Fu Hai , Huang Cheng Hua
Published: July 2012

The peroxyl radical scavenging abilities of fifty Chinese herbal medicines were determined accurately by an electron spin resonance (ESR) spin-trapping technique using 5,5-dimethyl-1-pyrroline 1-oxide (DMPO) as a spin-trapping reagent. The peroxyl radical was generated by the thermolysis reaction of 2,2’-Azobis(isobutyronitrile) (AIBN) in the presence of the spin-tap DMPO and with or without sample. As a result of these studies, a strong scavenging ability of peroxyl radical was found in Chinese medicines for diseases of anti-aging and blood circulation.
Preparation of ZnO:Zr Thin Films by Sputtering Zn:Zr Targets
Authors: Yuan Chang Kun
Published: July 2012

Transparent conductive ZnO:Zr thin films with different thicknesses were fabricated on glass slides by DC reactive magnetron sputtering from Zn:Zr targets consisting of Zn disk and Zr metallic chips in Ar+O2mixture gas. X-ray diffraction, four-point probe measurements, UV–vis spectrophotometers and thin film thickness tester were employed to characterize the structure, electrical and optical properties of ZnO:Zr films, respectively. The experimental investigations indicate that film thickness has an important effect on the crystal structure, optical and electrical properties of the deposited films.
LaF3 Influences on Wear Resistance of TiC/Ni Cladding Layer by Laser Cladding In Situ Fabricated
Authors: Wang Cheng Qiang , Wang Li Juan , Wu Jiang Qiao , Chen Zi Zhen , Niu Yong Jun
Published: July 2012

The TiC/Ni composite coating was prepared by Laser Cladding In-situ Synthesis on the surface of damper plate with Ni--Ti-Mo-C -LaF3 powder．Microstructure and Wear resistance have been studied throughout EPMA、SEM and M—2000 Friction and Wear Tester．It was found that the microstructure got more homogenized grain fineness became finer, TiC distributed better and heterogeneous phase decreased, as adding moderate rare earth LaF3. When the content of LaF3 was 1%, the highest microhardness was got. While the optimal wear resistance properties were obtained with 2% LaF3. The laser cladding with excessive LaF3 has more TiC particle segregation which induces hardness and wear resistance of cladding layer.
Synthesis and Adsorption of Molecularly Imprinted Polymers of Dibutyl Phthalate in Food
Authors: Zhu Jun Feng , Zhang Guang Hua , Shang Ting , Xiong Wei
Published: July 2012

In this paper, using environmental hormone dibutyl phthalate (DBP) in the contaminated foods as the template molecule, methacrylic acid (MAA) as functional monomer, ethylene glycol dimethacrylate ester (EDMA) as cross linking agent, the molecularly imprinted polymer (MIP) was prepared on the silica surface. The MIP was characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimeric analysis (TGA) and automated surface area analyzer. The property of adsorption was tested using static adsorption method in water phrase. The results of FTIR indicate that there are recognition groups in the microspheres after imprinting. TGA illustrates the silica gel surface has been coated with a layer of polymer after the synthesis reaction. And the MIP can bear the high temperature of 200 °C. The thickness of the imprinted polymer coated on silica gel surface is estimated via the pore size data is about 1. 5nm. The result of static adsorption experiment shows that the saturated adsorption capacity of the MIP was 8.940mg/g.
Preparation and Characterization of Cyanoethylated Cellulose Fiber
Authors: Xiu Hui Juan , Han Qing , Zhang Ru , Liu Li Hui
Published: July 2012

Natural fibers possess many good characteristics, such as abundance, low cost, renewable, biodegradability and photo-degradability that made it a hot spot in exploiting current resources. Chemical modification is a new way to make efficient use of forestry and farming waste natural fiber resources. In this work, softwood fibers were modified by cyanoethylation with acrylonitrile. The influence of acrylonitrile dosage, reaction time, reaction temperature and the time immersed in sodium hydroxide solution with KSCN saturated on cyanoethylation were investigated. Fibers chemical structure and surface morphology before and after modification were characterized by FTIR and scanning electron microscope separately.
Boron Recovery from the Liquid Mineral Resources
Authors: Lin Chen Xiao , Gao Dao Lin , Guo Ya Fei , Wang Shi Qiang , Deng Tian Long
Published: July 2012

In this paper, the processes on boron recovery from the liquid mineral resources (salt lake brine, oil- or gas-field water, and concentrate seawater) including the processes of precipitation, solvent extraction, fractional crystallization, ion exchange, and combined method at present were summarized, and the new trend in the future was also pointed out.
Synthesis and Structural Characterization of Mg/Al Hydrotalcite-Like Compounds
Authors: Guo Yan , Liu Wei Jun , Zhang Shu Hua , Yang Si Yuan , Zhang Kai Fei , Liao Jian Jun
Published: July 2012

Hydrotalcites consist of Brucite-like layers with positive charge and anionic compounds in the interlayer to form neutral materials. The general formula of hydrotalcite compounds (HTLc) was Mg-A1-HTLc. All samples were characterized by XRD, FT-IR spectra and TG. After calcination, the transformation of hydrotalcite structure can be characterized by vibration infrared bands corresponding to hydroxyl groups, octahedral layers and interlayer species. Moreover, the calcined samples show a relatively high surface area and total pore volume.
Preparation and Characterization of Anodic Alumina Membrane with Nanopore Arrays
Authors: Tang Xiao Hong , Yang Wen Bin , Cheng Ya Fei , Huang Quan Guo
Published: July 2012

Anodic alumina membranes (AAM) with nanopore arrays were prepared by one-step anodization of highly pure aluminum foil. Morphology, structure and composition of AAM were characterized by scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). Results showed that AAM owned honeycomb structure which was characterized by close-packed arrays of columnar hexagonal cells, each containing a central pore normal to the substrate. The diameter of pores and the size of cells changed under different anodic conditions, such as temperature, concentration of H2C2O4 solution, voltage and time of anodization. The walls of AAM were composed of two strains of nanoparticles of alumina. Furthermore, the chemical composition of AAM was found to be amorphous alumina. The prepared AAM with nanopore arrays is a kind of ideal template for preparation of many one-dimensional nanomaterials.
Sol-Gel Template Synthesis and Photocatalytic Property of Nano-TiO2 Co-Doped with La and Fe
Authors: Li Qing
Published: July 2012

Nano-TiO2 co-doped with lanthanum and iron photocatalyst powders were prepared with the sol-gel method and supercritical fluid drying(SCFD). The XRD、particle size distribution technique、TEM were used to characterize the hyperfine TiO2 particles.The TiO2 co-doped with different mass percentage of La3+ and Fe3+ were compared with pure TiO2 when being used as photocatalyst in degradation of methyl orange.The best catalytic activity was observed by TiO2 co-doped with 0.02%La-0.05%Fe(mol).Photocatalytic efficiency of the TiO2 co-doped with 0.02%La and 0.05%Fe is 1.625 times the pure TiO2.
Effects of Reactive Compatibilizer on the Rheological Properties and Crystallization Behavior of Poly(Trimethylene Terephthalate) Blends with Core-Shell Structured Modifiers
Authors: Wang Kun Yan , Ye Ying , Zhu Xiao Qing , Cao Feng
Published: July 2012

Poly (trimethylene terephthalate)/polybutadiene grafted polymetyl methacrylate (PB-g-PMMA, MB) blends were prepared by melt processing with and without diglycidyl ether of bisphenol-A (DGEBA) epoxy resin as a reactive compatibilizer. The rheological and crystallization properties of the prepared blends have been investigated. The complex viscosity of PTT/MB blend increased in the presence of DGEBA at low frequency range. Differential scanning colorimetry(DSC) experiments showed that the melting point of pure PTT and their blends was almost constant. Crystallization points decreased when 1wt% DGEBA added to the blend.
Studies on Electrooxidation Reaction of 4-Chlorophenol on Carbon Electrode by In Situ FTIR
Authors: Wang Fen , Ye Yong Wei , Ma Chun An , Li Mei Chao
Published: July 2012

Electrooxidation of 4-chlorophenol in acidic solution was studied by cyclic voltammetry and in situ FTIR spectroscopy. Compared with platinum (Pt) and glassy carbon (GC) electrodes, carbon electrode exhibited a high electrocatalytic activity during the electrooxidation reaction of 4-chlorophenol. The possible mechanism of 4-chlorophenol on carbon electrode was studies by in situ FTIR. At first, 4-chlorophenol was electrooxidized to 4-chlorophenolic radical, and then to phenoxylic radical. Then, the radical was electrooxidized to hydroquinone, benzoquinone or unsaturated carboxylic acids with potential increasing. In addition, with the reaction of phenoxyl radicals, the insoluble aromatic ether oligomer generated on the carbon electrode surface and prevented the further oxidation reaction of 4-CP in some degree.
Study on the Oxidation Coupling of Acetylene Catalyzed to Synthesize Carbyne by Ag (I)
Authors: Liu Hui Yun , Zhang Zhen , Hu Wei , Wang Ru
Published: July 2012

The synthesis of carbyne was studied by oxidation polycondensation of acetylene using HClO4 as the oxidizer, ammonia as the complexing agent, Ag (I) as the catalyst at 35°C with pH 7.0 in aqueous phase and benzene phase respectively. The configuration of carbyne was characterized by FT-IR, and the result showed that carbynes with longer carbon chain were synthesized in benzene by phase-transformation method. The HPLC analysis indicated that polyynes of less than or equal to 16 carbon were transferred to the benzene.
Synthesis of Well-Dispersed Copper Nanoparticles by L-Ascorbic Acid in Diethyleneglycol
Authors: Zhou Jun Cheng , He Wei , Tang Yao , Hu Yong Suan
Published: July 2012

Metallic copper nanoparticles were synthesized in the presence of poly(N-vinylpyrrolidone) (PVP) as the capping agent and L-ascorbic acid as the reducing agent in diethyleneglycol (DEG) solvent. The obtained copper nanoparticles were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The EDS and XRD results showed that the resultant particles were confirmed to be crystalline Cu with a face-centered cubic (fcc) structure. It was also observed that the diameter of obtained copper particles ranging from 80 to 120nm via SEM and TEM.
Preparation and Characterization of Cellulose Fibers Modified with Epoxy Chloropropane
Authors: Xiu Hui Juan , Han Qing , Peng Ke , Zhang Kun
Published: July 2012

Natural plant fibers possess a lot of advantages in chemical modification, such as easy process, extensive intensity range, better selectivity, good resistance to water, biodegradability and photo-degradability, that makes the etherification and esterification wood has good development prospect. In this paper, softwood fibers were used as raw material and epoxy chloropropane as modifier. The influences of epoxy chloropropane dosage, reaction time and temperature, and the dosage of NaOH on the modification were analyzed. Simultaneity, an FTIR study was performed to show the partial substitution of hydroxyl groups by the epoxy group. And surface morphology of fibers modified was characterized by scanning electron microscope.
Flue Gas Desulfurization over Copper Oxide Loaded on Complex Carrier of Attapulgite and Activated Carbon
Authors: Yang Yong , Yu Hu Peng , Jiang Jin Long , Qian Yun Hua
Published: July 2012

Sorbent of CuO loaded on complex carrier of attapulgite and activated carbon was prepared by incipient impregnation method for flue gas desulfurization. The effects of CuO loading, reaction temperature and components in flue gas on the desulfurization performance were investigated in a fixed-bed quartz reactor. The experimental results indicate that the sorbents of 20 wt% CuO loading has a high desulfurization activity under conditions of reaction temperatures 200-250 oC and 21000 h-1, and O2 is necessary for the high desulfurization activity of the sorbents.
The Preparation of Chemoselective Ruthenium Catalyst for the Hydrogenation of Ketones
Authors: Li Xiao Yan , Zheng Mang , Guan Ru Qi , Liu Yan Mei , Zhao Ya Juan , Chao Guo Ku
Published: July 2012

This work is directed towards the preparation of chemoselective ruthenium catalyst. The catalyst is a new type of ruthenium(II) complexes supported on γ-Al2O3, which have ruthenium(II) centers coordinated to the ligands triphenylphosphine and (1S,2S)-1,2-Diphenyl-1,2-ethanediamine. The catalyst for the selective hydrogenation of ketones in the mild conditions is investigated. The results show that the performance of the catalystis greatly influenced by the ratio of Ru and PPh3 and reduction time, respectively.
Effect of Hydrogen Peroxide Detemplation on the Structure and Acid Properties of MCM-56 Zeolite
Authors: Zhao Fei , Zhang Yu , Xing Hai Jun , Jia Ming Jun , Wu Tong Hao
Published: July 2012

MCM-56 zeolite has been synthesized by dynamic hydrothermal method. The template of as-made MCM-56 was removed by two methods. One is traditional calcination, the other is hydrogen peroxide post-treatment. All materials were characterized by different techniques, such as XRD, N2 adsorption-desorption, NH3-TPD and FTIR. Results show that the template of as-made MCM-56 could be removed effectively by hydrogen peroxide post-treatment. The topology of the hydrogen peroxide treated MCM-56 remains unchanged. The BET surface area and external surface area of MCM-56 zeolite could be obviously improved by hydrogen peroxide treatment. The amount of acid sites was increased by hydrogen peroxide treatment but the acid strength was not modified.
Preparation and Characterization of AgA Zeolite/Polysulfone Membranes
Authors: Zhang Tian Ming , Huang Zhen , Zhang Xiao Hong , Guo Li Ying
Published: July 2012

In present study, a few polysulfone composite membranes with the introduction of silver ion-exchange treated zeolite were prepared and evaluated by several characterization methods. Regularly-ordered zeolite particles were generally finely dispersed in the continuous PSF phase with appreciated organic-inorganic interfacial interactions as reflected by SEM and FTIR results. Gas permeation test shows that after incorporating zeolite the polysulfone membrane exhibits significantly decreased gas permeability for H2, N2, and CO2 whereas they show increased permselectivity for CO2/N2, H2/CO2 and H2/N2 gas pairs as compared to neat polysulfone membrane.
Chemical Fixation of Carbon Dioxide Catalyzed by Bimetallic Aluminum(Salen) Complex
Authors: Duan Zhen Xiao , Fang Tao , Wang Min , Fan Guo Zhi
Published: July 2012

Bimetallic aluminum(salen) complexes were prepared and used as catalyst for the synthesis of DPC from CO2 and phenol in the presence of carbon tetrachloride. The bimetallic complex derived from 3,5-ditert salicylaldehyde and 1,2-cyclohexanediamine revealed more excellent activity than that obtained in the presence of other complexes and the simple Lewis acid ZnCl2. The influence of the amount of complex and the reaction conditions including the pressure of CO2 and the reaction temperature was also investigated.
An Improved TB Method for the AlGaN/GaN Superlattice
Authors: Chen Jun Feng , Yu Xiang Zhen
Published: July 2012

The tradition energy dispersion model can not match the experiment results of the AlGaN/GaN superlattice with strong polarization effect. Thus we propose a new dispersion model from the improved tight binding method. In this model, the couple of wavefunctions from more potential wells are considered. To a AlGaN/GaN superlattice with 1.5nm well length, 1nm barrier length and 25% Al content, the calculation result shows that the improved model are much more precise than the tradition model. This improved dispersion model can be used in the study of the nonlinear transport of AlGaN/GaN superlattice.
Experimental Study on Catalytic Oxidation of Cyclohexane Catalyzed by Phosphomolybdic Acid
Authors: Zhang Jiao Jing , Song Hua Lin , Wang Jian , Song Hua
Published: July 2012

The catalytic oxidation of cyclohexane to cyclohexanone and cyclohexanol using hydrogen peroxide over phosphomolybdic acid were studied. Factors such as the amount of catalyst, amount of the oxidant (H2O2), reaction temperature and reaction time were investigated. The conversion of cyclohexane was 35.35%, the total selectivity to cyclohexanone and cyclohexanol was 97.68% at a reaction temperature of 70 °C, reaction time of 8 h, 10 mL of acetone, 0.01 g of phosphomolybdic acid and 0.5 mL of hydrogen peroxide.
COD Removal of Washing Water by Photodegradation
Authors: Zhang Qiao Ling , Chen Zhi Jun , Zhu Ye , Xie Hong Yong
Published: July 2012

Degradation of the wastewater of washing oil tanks after degreasing and minimal treatment by photocatalysis is studied by using a rotating photoreactor and TiO2 photocatalyst of Degussa P25. Effects of irradiation time and pH value on removing efficiency are investigated. The results show that the COD down to about 80mg/L can be achieved at the irradiation time of about 4-5 hours at mild pH valus. At the pH value from 1.5 to 3.2, the COD down to about 80mg/L can be achieved at the irradiation time less than 1 hour, and the COD down to about 20mg/L could be achieved at the irradiation time of about 4 hours at a pH value of about 3.2.
Studies on Preparation and Adsorption Behavior of Cd2+ Ions-Imprinted Polymer
Authors: Shi Ying Ying , Zhang Qiang Hua , Feng Liang Dong , Xiong Qing Ping
Published: July 2012

Using Palygorskite as matrix, chitosan(CTS) as functional monomer, and introducing the ion-imprinting technique to the synthesis process, a new Cd2+-IIP was prepared for selective separation of Cd2+ from aqueous solution was prepared. The static method was adopted to study the adsorption capacity of Cd2+-IIP for Cd2+, and the effects of contact time, pH value, adsorbent dosage and temperature of the initial solution on the adsorption characters of Cd2+ were investigated. Experiment results indicated that the adsorption was rapid during the first 20 minuts and equilibrium were attained within 70 minutes. The Cd2+-IIP had higher adsorption capacity to Cd2+ than other different ions. There were less difference in the adsorption capacity between different dosages of Cd2+-IIP, but the adsorption capacity of Cd2+ adsorbed onto Cd2+-IIP decreased with increasing the dosages.Under the optimum conditions, the ions-imprinted polymer offered a fast adsorption of Cd2+ and the maximum capacity was 18.20 mg/g.
Adsorption of Cd(II) and Pb(II) from Wastewater onto Porous Lignin Beads
Authors: Li Xian Fa , Luo Xue Gang
Published: July 2012

In this paper, a crosslinked porous lignin beads (PLB) as adsorbent was adopted to adsorb toxic Pb2+ and Cd2+ ions from aqueous solutions. The pore structure and surface morphology of PLB were characterized by by a variety of techniques. The influences of pH, contact time, initial metal ions concentration, temperatures were investigated. The results showed that the adsorption of both heavy metal ions increases with pH. The adsorption equilibrium data under different temperature can be successfully described by Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherms. The Langmuir adsorption model showed the best fit to the adsorption data of Cd2+ and D-R model fits best to the adsorption data of Pb2+. The results obtained also indicated that the adsorption of Cd2+ and Pb2+ increased with increasing temperature indicating endothermic nature of the adsorption process. The kinetic study showed that Cd2+ adsorption followed pseudo-second order rate kinetics and Pb2+ adsorption followed pseudo-first order rate kinetics. Cd2+ adsorption on PLB was mainly through the chemisorption mechanism (ED-R between 12.62 kJ•mol-1 and 16.20 kJ•mol-1) while physical and chemical absorption coexistence was observed to Pb2+ adsorption. Desorption studies revealed that the desorption rate increased with increasing hydrochloric acid concentration and could finally reach 94 % and 85.1 % for Cd2+ and Pb2+, respectively, by adding 3 mol/L of HCl.
Hydrometallurgical Purification of Metallurgy Grade Silicon by Acid Leaching
Authors: Zeng Rui , Wang Yun Hua , Zhang Ji Xiang , Xu Jin Quan , Li Hai Yan , Chen Xiao Fan , Xing Wei Dong
Published: July 2012

This paper studied the purification of metallurgy grade silicon by acid leaching with different type acid and concentration. Before experiment, silicon metal had already handled by slagging process, so most boron was removed. In this paper, we grinded materials into 80-400 mesh powder, and compared the purification effect of using aqua regia, hydrochloric acid and hydrofluoric acid, respectively. With regard to the silicon metal, single acid cannot remove the impurities perfectly, but the effect of using hydrochloric acid first and following with hydrofluoric acid can be better. The removal rates of Mg, Al, Ca, Fe, and Ti were 96.8%, 96.8%, 98.2%, 99.7%, and 98.0%, respectively. Then adjust the concentration of both acid to be 14% and 7% by weight, it turned out that 14% was much better. The removal rates of Mg, Al, Ca, Fe, and Ti were 87.1%, 97.4%, 99.0%, 99.7%, and 99.1%, respectively. The results indicate that purification by multiple acids and 14% concentration could be an effective condition to remove impurities in silicon for acid leaching.
Experimental Study on Catalytic Combustion of Gasoline Vapor
Authors: Wang Pei Wen , Du Yang , Zhou De Wen , Liang Jian Jun , Zhou Yi
Published: July 2012

This paper provides the results of an experimental research on the performance of catalytic combustion of gasoline vapor. A packed bed reactor was built to test the effect of inlet temperature and concentration on catalytic combustion of gasoline vapor over Pd/Al2O3. The study shows that catalytic combustion is a cost-effective and environmental friendly method to control this kind of emission. The light-off temperature is quite low and full conversion rate is easy to achieve. Meanwhile, the method of controlling the bed temperature is proposed to avoid sintering if the technology is utilized in larger-scale equipment.