jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Hossam Altaher | Fahd M. Al‐Oufi | Yehia H. Magdy | Manar Hassan
Source: Yanbu Journal of Engineering and Science (article, 2021-08-31)
Field: Chemistry — Organic Chemistry

MICROWAVE AGAINST THERMAL TREATMENT FOR MANUFACTURING OF ACTIVATED CARBON FROM AGRICULTURAL WASTES AND ITS USE TO ADSORB METHYLENE BLUE-EQUILIBRIUM AD KINETIC STUDIES By Hossam Altaher, Fahd M. Al-Oufi & 2 more. Date pits, a widely available agricultural waste, was used to produce two samples of activated carbon and the efficiency towards methylene blue adsorption was investigated. Methylene blue ; Adsorption ; Activated carbon ; Microwave ; Agricultural waste ; Methylene ; Agriculture ; Carbon fibers ; Chemistry ; Thermal ; Kinetic energy ; Chemical engineering ; Materials science ; Waste management ; Organic chemistry ; Composite material ; Thermodynamics ; Computer science ; Catalysis ; Telecommunications ; Engineering ; Physics Inorganic and Organometallic Chemistry ; Environmental and Analytical Chemistry Studies
Authors: Ivan Saldan | Ľubomír Orovčík | Oksana Dobrovetska | Oleh Bilan | О. І. Кuntyi
Source: Chemistry & Chemical Technology (article, 2021-02-14)
Field: Materials Science — Materials Chemistry

Chemical Leaching of Al3Ni and Al3Ti Alloys at Room Temperature Al3Ni and Al3Ti alloys were prepared by arc melting and exposed to chemical leaching in 5M NaOH at room temperature. In case of Al3Ni alloy, Al reached phases react with the leaching solution to produce nanoporous nickel with a pore diameter in the range of ~10–20 nm. Only pure Al phase of Al3Ti alloy chemically reacts with the production of a dense wrinkled surface with a wrinkle size of ~50–100 nm. Leaching (pedology) ; Alloy ; Materials science ; Metallurgy ; Nickel ; Nanoporous ; Chemical engineering ; Nanotechnology ; Environmental science Nanoporous metals and alloys ; Anodic Oxide Films and Nanostructures ; MXene and MAX Phase Materials
Authors: Ke Bai | Senqing Fan | Yu Chen | Yilin Wang | Jiaojiao Chen | Zenghui Mai | Jingyun Liu | Lei Deng | Zeyi Xiao
Source:  (preprint, 2021-12-22)
Field: Chemistry — Inorganic Chemistry

Membrane adsorber with hierarchically porous HKUST-1 immobilized in membrane pores by flowing synthesis A membrane adsorber with hierarchically porous HKUST-1 (HP-HKUST-1) immobilized in membrane pores has been fabricated by flowing synthesis. The XRD characteristics indicated that the structure integrity of the HP-HKUST-1 immobilized in the membrane pores can be kept after template agent removed. Other characteristics presented by XPS, FTIR, SEM, TEM and BET proved the effective immobilization of HP-HKUST-1 in membrane pores. Compared with hydrothermal HKUST-1 powder, the adsorption capacity for Congo red and Methylene blue adsorption can be increased several times by hydrothermal HP-HKUST-1 powder, owing to the mesopores with rich active sites for adsorption. When the solution was flowed through the membrane adsorber, the adsorption rate for these adsorbates increased significantly, owing to the enhanced mass transfer in the confined space of the membrane pores with micro or nano scale. After going through seven adsorption-desorption experiments, the membrane adsorber with HP-HKUST-1 immobilized in membrane pores shows a remarkable repeatability. Membrane ; Adsorption ; Chemical engineering ; Mesoporous material ; Porosity ; Materials science ; Fourier transform infrared spectroscopy ; Hydrothermal circulation ; Chromatography ; Hydrothermal synthesis ; Methylene blue ; Chemistry ; Organic chemistry ; Catalysis ; Composite material Metal-Organic Frameworks: Synthesis and Applications ; Advanced biosensing and bioanalysis techniques ; Analytical Chemistry and Sensors
Authors: Marwa Abd El-Aziz | Soha Ismail | Mina Ibrahim Tadros | Mohamed A. El-Nabarawi
Source: Pharmaceutical Sciences Asia (article, 2021-01-01)
Field: Chemistry — Spectroscopy

Low density alfuzosin hydrochloride floating tablets: in vitro characterization and in vivo gastroretentive MRI tracking in healthy volunteers The current work aimed to develop promising floating sustained release systems for alfuzosin hydrochloride (ALF) utilizing sublimation technique. Gastroretentive tablets were prepared by direct compression and subsequent sublimation of the loaded sublimable agents. Polyethylene oxide WSR N-60K (PEO) or Carbopol 934 (CP) were used as release retarding polymers. Camphor or menthol were used as sublimable agents at concentrations of 3%, 6%, 9% or 12% w/w. FTIR and DSC were performed to check possible drug-excipients incompatibility. The tablets were evaluated for appearance, hardness, friability, density, floating characters, and in-vitro drug release. The drug release percentages after 0.5h (Q0.5h) and 8h (Q8h) were estimated. Based on estimation of the desirability values, the best-achieved formula (F1) was morphologically evaluated via SEM. The gastroretentive tracking of the magnetite-loaded F1 tablets was performed via MRI in healthy human volunteers. FT-IR spectra and DSC thermograms confirmed drug-excipients compatibility. PEO-and CP-based systems exhibited acceptable physicochemical characteristics regarding their appearance, hardness and friability. They exhibited low bulk density values (< 1 g/cm 3 ) allowing them to float spontaneously (zero lag times), for at least 8h. Significantly higher (p<0.0001) Q0.5h were revealed with CP-based tablets. No significant difference (p=0.3529) was elucidated between Q8h values of the corresponding CP-based and PEO-based tablets. Following sublimation, SEM micrographs of F1 confirmed the presence of a low bulk density porous matrix. The gastroretentive potential of F1 was suggested for at least 5 h in healthy human volunteers. F1 is a promising gastroretentive system for ALF. In vivo ; In vitro ; Alfuzosin ; Tracking (education) ; Biomedical engineering ; Pharmacology ; Medicine ; Chemistry ; Internal medicine ; Psychology ; Biology ; Biochemistry Advanced NMR Techniques and Applications ; Drug Solubulity and Delivery Systems ; Gastroesophageal reflux and treatments
Authors: Alireza Nasiri | Mohammad Heidari | Neda Javid | Ghazal Yazdanpanah
Source: Research Square (preprint, 2021-07-12)
Field: Chemistry — Organic Chemistry

Preparation of CoFe2O4@Carboxymethylcellulose/HZSM-5 as a Novel Nano Magnetic Adsorbent for Metronidazole Removal: Isotherm, Kinetic and Thermodynamic Study Adsorption ; Nano- ; Materials science ; Kinetic energy ; Chemical engineering ; Chemistry ; Physical chemistry ; Physics ; Composite material ; Engineering Nanomaterials for catalytic reactions ; Adsorption and biosorption for pollutant removal ; Extraction and Separation Processes
Authors: G Allouga | M. Demerdash | S References Afifi | M Abo-Aly | S Elashry | J Cortina | N Miralles | M Demerdash | K Fereshte | S Sh | S Amir | T Jaber | Rezvan | S Gonzalez-Luque | M Streat | L Hadjittofi | I Pashalidis | Y Ho | G Mckay | R Ilia | I Liatsou | I Savva | E Vasile | L Vekas | O Marinica | M Khan | P Warwick | N Evans | M Mahdy | G Dabbour | I Assy | W Runde | J Kim | M Saleh | J Vitor | M Vilar | A Cidalia | Rui
Source: Current Science International (article, 2021-01-01)
Field: Chemistry — Inorganic Chemistry

Kinetics investigation of uranium sorption from alkaline solutions of CalcareousShale, Um Bogma formation, G. Allouga, Southwestern Sinai, Egypt by Lewatitresin in batch system Experimental and theoretical studies of the sorption kinetics of uranium carbonate anion from its alkaline solution obtained from um Bogma dissolute liquor on the strong base anion exchange Lewatit Mono Plus M500 (LMP) sorbent was achieved using batch technique. The experimental results using the latter technique were fitted well with pseudo second-order kinetics model. The dependence of the sorption kinetic parameters on the temperature of the solution has been investigated. The pH of solution and agitation speed have dramatic effects on the uptake of uranium carbonate anion by LMP. It was found that pH range from 8.5-9.5 and agitation speed of 300 rpm. The proper conditions for uranium carbonate anion sorption at the present experimental. The fit of experimental data with the homogeneous diffusion model (HDM) equations demonstrated the possibility of using this model for adequate description of the uranium sorption kinetics on the LMP sorbent. Two stages of adsorption with different controlling processes were proposed. Liquid film diffusion controls the process at the early stage of the adsorption followed by matrix diffusion which controls the process in the final stage. Two different equations were used to express each stage. Calcareous ; Oil shale ; Sorption ; Uranium ; Kinetics ; Geology ; Chemistry ; Geochemistry ; Mineralogy ; Nuclear chemistry ; Metallurgy ; Materials science ; Adsorption ; Organic chemistry Radioactive element chemistry and processing ; Hydrocarbon exploration and reservoir analysis ; Extraction and Separation Processes
Authors: Dalia Ali | Marc Shawky | Hoda Elsawy | H Shehta | I Ahmed Ragab | M Alqaragully | L Hench | J | M El-Kholy | A | M Nazeer | E | R Morsy | S Mousavi | M | P Prado
Source: International Journal of Advanced Trends in Computer Science and Engineering (article, 2021-01-01)
Field: Chemistry — Analytical Chemistry

Kinetics, Isotherm and Optimum Condition for the Adsorption of Methyl Red Dye Using Hydroxyapatite The aim of the experiment is to remove dyes from wastewater using adsorption technique. The hydroxyapatite was used as an adsorbent to remove methyl red dye. The adsorption process was carried out with four different experiments. The first one is changing the contact time, and the optimum contact time was found to be 90 minutes with a 97 percent removal. The second experiment was carried away by changing the pH of the medium and using the optimum contact time obtained from the previous experiment. The optimum pH in the second experiment was found to be 4 with a 91.6 percent removal. The third interpretation was analysed by changing the initial concentration of the dye and using the optimum contact time and pH obtained from the two previous experiments. The optimum initial concentration of the dye in the third experiment was found to be 0.1 ppm with a 94.6 percent removal. Finally, the fourth analysis by using the optimum time, pH and initial concentration obtained from the three previous experiments, but the adsorbent dose was changing. It was found that the optimum adsorbent dose was found to be 2 g/l with 94.6% percent removal. According to the two parameter isotherms, the adsorption process followed Freundlich isotherm model, and Halsey isotherm as they had the higher R2 values, which shows that the adsorbent surface is heterogenous. The kinetics of the adsorption process was found to be pseudo second order. The mechanism of the adsorption process was studied by intraparticle diffusion and which indicated the ionic state of the dye. Adsorption ; Kinetics ; Sorption isotherm ; Chemistry ; Chromatography ; Chemical engineering ; Nuclear chemistry ; Materials science ; Organic chemistry ; Physics ; Engineering Dye analysis and toxicity ; Adsorption and biosorption for pollutant removal ; Synthesis of Tetrazole Derivatives
Authors: M. Khaіry | Rasha S. Kamal | M. A. Mousa
Source: Research Square (preprint, 2021-03-05)
Field: Materials Science — Materials Chemistry

High Performance of Multifunctional Cotton Fabrics Modified with TiO2, Fe, Ag-doped TiO2 and Graphene Oxide Nanomaterials towards Antimicrobial and Adsorption Removal of Methylene Blue Dye Methylene blue ; Graphene ; Nanomaterials ; Adsorption ; Oxide ; Doping ; Materials science ; Antimicrobial ; Chemical engineering ; Nanotechnology ; Chemistry ; Photocatalysis ; Organic chemistry ; Catalysis ; Optoelectronics ; Metallurgy Nanoparticles: synthesis and applications ; Graphene and Nanomaterials Applications ; Nanomaterials for catalytic reactions
Authors: I. Altinsoy
Source: Sakarya University Journal of Science (article, 2021-11-17)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Electromagnetic Shielding Properties of Pack Borided MirraxTM Steel In this study, it was aimed to investigate the electromagnetic interference shielding (EMI-SE) as well as some physical and mechanical properties of pack borided Mirrax tool steel. Boriding process was carried out at 900, 950 and 1000°C for 2, 5,8h, respectively. Optical images showed that borides layer have smooth morphology and flat interface with matrix. XRD analysis revealed that main phases in the layer were FeB and Fe2B. Intensity of FeB phases increased with increment of process temperature and time. Depending on process time and temperature the thickness of borides layer was ranged from 10 mm to 87.80 um. Microhardness of layer was between 1700 and 2400 HV. EMI-SE measurements conducted within Ku band (12-20 GHz) indicated that EMI-SE efficiency increased by increasing of process time and temperature and it was ranged from 52dB to 75dB. It is possible to claim that borided Mirrax steel performed good EMI-SE and when boriding time reached to 5h, remarkable EMI-SE (electromagnetic interference shielding) (over 60dB) was observed on the sample borided even at 900°C. Boriding ; Materials science ; EMI ; Electromagnetic interference ; Electromagnetic shielding ; Indentation hardness ; Layer (electronics) ; Composite material ; Metallurgy ; Microstructure ; Electrical engineering ; Engineering Electromagnetic wave absorption materials ; Aluminum Alloys Composites Properties ; Surface Treatment and Coatings
Authors: Fatai Alade Aderibigbe | Tunmise Latifat Adewoye | Sherif Ishola Mustapha | I.A. Mohammed | Harvis Bamidele Saka | Mutiu Kolade Amosa | Ayoade L. Adejumo | R. U. Owolabi | Shalom Boluwatife James
Source: Journal of Engineering Research (article, 2021-11-21)
Field: Materials Science — Materials Chemistry

PHENOL removal in refinery wastewater using mixed oxides prepared by green synthesis Mixed solid oxides are known for their excellent catalytic property and applications in environmental remediation. This study presents a green-synthesis route for magnesium oxide–titanium oxide, a mixed oxide here demonstrated to possess high performance of phenol removal from hydrocarbon refinery process wastewater. Mixed oxide (MgO-TiO2) was prepared by using the whole extract from leaves of Piliostigma Thonningii as reducing agent. Structural characterization of the mixed oxide was done using X-ray Diffractometer, High Resolution Scanning Electronic Microscopy and Energy Dispersive X-ray. Petroleum refinery raw wastewater having phenol concentration of 19.961 mg/L was treated using the green-synthesized mixed oxide. Adsorptive phenols removal up to 99.5% was achieved with a dosage of 0.04 g/100 mL at temperature of 35 °C, and contact time of 1.167 h. By this, the treated water meets the standard acceptable phenol concentration (0.1 mg/L) in wastewater of hydrocarbon refinery. Phenol ; Wastewater ; Refinery ; Mixed oxide ; Oxide ; Chemistry ; Hydrocarbon ; Catalysis ; Nuclear chemistry ; Materials science ; Waste management ; Organic chemistry Magnesium Oxide Properties and Applications ; Geochemistry and Elemental Analysis
Authors: Ebtesam E. Ateia | Kareem Elsayed | Rania Ramadan
Source: Research Square (preprint, 2021-12-20)
Field: Materials Science — Materials Chemistry

Tuning The Properties of Ba-M Hexaferrite BaFe11.5Co0.5O19: A Road Towards Diverse Applications Abstract The development of hexaferrite nanoparticles is scrutinized as potential sorbents for the removal of chromium (Cr) ions from aqueous chromium-containing solutions in a batch adsorption experiment. The transition metal Co doped BaFe 12 O 19 hexaferrite compounds (BHF) have been synthesized successfully via citrate auto combustion technique. Structural, morphological, and magnetic properties are testified. X-ray diffraction pattern ratifies the existence of hexagonal phase as a main phase for the prepared samples. The average crystallite sizes are found in the range of 47–49 nm. The high-resolution transmission electron microscopy (HRTEM), as well as the Fourier, transform infrared spectrophotometry results confirm an M-type hexagonal structure existing. The c-T indicates the temperature-dependent ferromagnetic behavior of BHF nanoparticles. The derivative shows a single transition temperature Tc at 698 °C, 710 for BHF and BHCF respectively. The prepared samples are utilized as an adsorbent for the removal of Cr (VI) from the aqueous solution. The maximum adsorption capacity (qm) of Cr (VI) on the nano hexaferrite is higher than that of various other adsorbents testified in the literature. The pseudo-second-order kinetic model gives a better fit to the experimental data Nanotechnology ; Materials science ; Business Magnetic Properties and Synthesis of Ferrites ; Advancements in Battery Materials ; Iron oxide chemistry and applications
Authors: Liqun Yang | Yong-kuo Liu | Minjun Peng | Abiodun Ayodeji | Zhitao Chen | Ze-yu Long
Source: Nuclear Engineering and Technology (article, 2021-07-15)
Field: Materials Science — Materials Chemistry

Radioactive gas diffusion simulation and inhaled effective dose evaluation during nuclear decommissioning During the decommissioning of the nuclear facilities, the radioactive gases in pressure vessels may leak due to the demolition operations. The decommissioning site has large space, slow air circulation, and many large nuclear facilities, which increase the difficulty of workers' inhalation exposure assessment. In order to dynamically evaluate the activity distribution of radionuclides and the committed effective dose from inhalation in nuclear decommissioning environment, an inhalation exposure assessment method based on the modified eddy-diffusion model and the inhaled dose conversion factor is proposed in this paper. The method takes into account the influence of building, facilities, exhaust ducts, etc. on the distribution of radioactive gases, and can evaluate the influence of radioactive gases diffusion on workers during the decommissioning of nuclear facilities. Nuclear decommissioning ; Radioactive waste ; Radionuclide ; Environmental science ; Demolition ; Inhalation ; Waste management ; Nuclear engineering ; Diffusion ; Engineering ; Civil engineering ; Nuclear physics ; Medicine ; Physics Graphite, nuclear technology, radiation studies ; Nuclear and radioactivity studies ; Radioactivity and Radon Measurements
Authors: Vijayarani Allam | Sailaja Budati Bala Venkata | Sirisha David
Source: American Journal of Chemical and Biochemical Engineering (article, 2021-01-01)
Field: Chemistry — Analytical Chemistry

Arsenic (III) Biosorption with Fenugreek (Methi) Seed Powder as a Low-cost Biosorbent This research study focuses at the use of fenugreek seed powder as a bio adsorbent for removing arsenic from aqueous media. Metal biosorption research on Fenugreek seed powder has been studied in just a few studies. SEM, FTIR, and XRD were used to investigate the constituents and properties of fenugreek seed powder, which revealed the constituents and properties that enabled the arsenic biosorption process to succeed. To investigate the strength of arsenic adsorption using Fenugreek seed powder as a bioadsorbent, the effects of primary parameters including contact time, dose, concentration, pH, and temperature were used. The report of these parameters suggested that as the parameters increased, the efficient removal of arsenic increased until equilibrium was reached, but no successful results were seen after gaining the equilibrium. The biosorption process to Freundlich isotherm and pseudo kinetic order in liner form with better correlation coefficients was verified by a survey of biosorption isotherms and kinetic results. The system was endothermic, random, and favourable with biosorption characteristics at various temperatures, as determined by the thermodynamic constants. As a result of these findings, fenugreek seed powder has been modified for arsenic adsorption. Biosorption ; Arsenic ; Adsorption ; Chemistry ; Freundlich equation ; Endothermic process ; Nuclear chemistry ; Aqueous solution ; Sorption ; Organic chemistry Dye analysis and toxicity
Authors: Hajar Farzaneh | Jayaprakash Saththasivam | Gordon McKay | Prakash Parthasarathy
Source: Research Square (preprint, 2021-04-07)
Field: Chemistry — Spectroscopy

Adsorbent Minimisation for Removal of Ibuprofen from Water in a Two-Stage Batch Process Abstract Pharmaceutical products in water, frequently referred to as personal pharmaceutical products, PCPPs are regarded as problematic emerging pollutants with the potential to cause damaging health and environmental impacts to several ecosystems. In this study, an acid activated carbon has been produced from waste date stones, the waste product obtained from the seedless date products manufacturing industry. This material has been used to remove the pharmaceutical compound ibuprofen from water with a high adsorption capacity of 126 mg ibuprofen per g waste date stone derived activated carbon. In order to optimise the use of the activated carbon, a design study has been performed to minimise the quantity of carbon needed using a two-stage batch adsorption system. Several variables have been inputted into the design model to test the model and compare the quantities of adsorbent required in the two-stage and the single stage systems under various conditions. Minimisation (clinical trials) ; Ibuprofen ; Process engineering ; Environmental science ; Waste management ; Medicine ; Mathematics ; Pharmacology ; Engineering ; Statistics Analytical Chemistry and Chromatography ; Analytical chemistry methods development ; Pharmaceutical and Antibiotic Environmental Impacts
Authors: Tim Tichter | Rohan Borah | Thomas Nann
Source: ChemElectroChem (preprint, 2021-07-07)
Field: Materials Science — Polymers and Plastics

A Theoretical Framework for the Electrochemical Characterization of Anisotropic Micro‐Emulsions** Abstract Micro emulsions (MEs) offer an exceptionally broad spectrum of applications covering sensing, electrosynthesis, supercapacitors and redox‐flow batteries. Herein, we develop the theory for a sophisticated electrochemical characterizion of MEs with a spatially and time‐invariant anisotropy in the diffusion domain by means of cyclic voltammerty (CV). By introducing spatially dependent diffusion coefficients into Ficks' first law, we derive a modified diffusion equation to simulate any inherent anisotropy of the ME under investigation. Moreover, by formulating an extended second‐order homogeneous six‐member square scheme for a kinetically controlled two‐step two‐electron reaction we capture the intricate entanglement of chemical and electrochemical equilibria. Our theoretical concept is finally validated by experimental CV data for the ME based two‐step redox reaction of methyl‐viologen which paves the way for a quantitative electrochemical characterization MEs. Electrochemistry ; Redox ; Electrosynthesis ; Anisotropy ; Characterization (materials science) ; Supercapacitor ; Homogeneous ; Diffusion ; Materials science ; Chemistry ; Chemical physics ; Nanotechnology ; Physics ; Thermodynamics ; Physical chemistry ; Electrode ; Quantum mechanics ; Inorganic chemistry Conducting polymers and applications ; Electrocatalysts for Energy Conversion ; Advanced battery technologies research
Authors: Songrui Hou | Bo Sun | Fei Tian | Qingan Cai | Youming Xu | Shanmin Wang | Wanyue Peng | Xi Chen | Zhifeng Ren | Chen Li | Richard Wilson
Source: Research Square (preprint, 2021-10-29)
Field: Materials Science — Materials Chemistry

Thermal Conductivity of BAs under Pressure Thermal conductivity ; Thermal ; Materials science ; Mechanics ; Thermodynamics ; Physics Thermal properties of materials ; Advanced ceramic materials synthesis ; Thermal Expansion and Ionic Conductivity