bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of Different Solvent Characteristics on the Proton‐Ligand and Sm+3‐Ligand Formation Constant of Butanamide‐3‐[2‐[(2‐Hydroxyphenyl Methylene) Amino]Ethylimino]N‐Phenyl(BHPAP) in Mixed Solvents
Authors: Eid Mohammed F. , Mahmoud Faten Z. 
Published: May 2015

AbstractComplexes equilibrium of (BHPAP) with proton and Sm+3 ion has been measured in various mixed aqueous solvents, viz.; methanol‐water, ethanol‐water, acetone‐water and dioxane‐water. Based on potentiometric equilibrium measurements of hydrogen ion concentration at 30 °C, ionic strength 0.1 M KNO3 and in the above various mixed solvents, the values of protonation constant of BHPAP‐Sm+3 complex have been evaluated. The variation of protonation and stability constants with the inverse of dielectric constant or mole fraction of solvent was studied. Application of Fuoss expression and consideration of electrostatic and non‐electrostatic effects are made to explain the above constants.The solid complexes were isolated for each Pr+3 and Nd+3‐BHPAP. Elemental analysis, conductance, infrared spectra, and electronic spectra for these solutions and TG, DTG and DTA measurements characterized these solids. The ligand behaves towards the metal ion as a dibasic tetradentate ligand.
Synthesis of Pyrano[4,3‐d]pyrimidine Derivative and Its Behaviour towards Nitrogen Nucleophiles and Active Methylenes
Authors: Abdel‐Razik H. H. 
Published: May 2015

AbstractPyrano[4,3‐d]pyrimidine derivative 3 was prepared by reaction of chlorocarbonyl isocyanate 1 with enaminonitrile 2.Compound 3 reacted with nitrogen nucleophiles 4a‐f to afford 2‐substituted pyrido[4,3d]pyrimidine 5–8, pyrimido[i]1,5a‐diaza‐9‐oxafluorene 9 and pyrimido[i]5a‐aza‐9‐thiafluorene 10 derivatives. Also, compound 3 reacted with active methylene compounds 4j to yield pyrimidine derivatives 14–16 which on reaction with EtONa 4k afforded 1,5,7‐triaza‐10‐oxaphenanthrene derivatives 17–19.
Synthesis of 2‐Dihydrooxadiazolinyl Chromones
Authors: Cao Ling‐Hua , Cui Peng‐Yuan 
Published: May 2015

AbstractReactions of the substituted 2‐formyl chromones with aroylhydrazines gave corresponding 2‐(aroylhydrazonomethylidyne) chromones. Then 2‐(3′‐acetyl‐5′‐aryl‐2′,3′‐dihydro‐1′,3′,4′‐oxadiazol‐2′‐yl) chromones were prepared by these 2‐(aroylhydrazonomethylidyne) chromones under refluxing with Ac2O. All target compounds were characterized through elemental analysis and IR, 1H NMR, MS.
Free Radical‐Induced and Pd(II) Complexes‐Catalyzed Poly(norbornene) Formation
Authors: Yeh An‐Chi 
Published: May 2015

AbstractThe reactions of norbornene polymerization were catalyzed by Pd(CH3CN)4(BF4)2 (1), AIBN (2), and [{(2,6‐C6H3(iPr)2)N=C(Me)}2Pd(Me)(CH3CN)][BF4] (3) without using methylalumoxane (MAO). These poly(norbornene)s are readily soluble in organic solvents such as toluene, dichloromethane and tetrahydrofuran.According to the NMR data, the end group of PNA resulting from the AIBN process is found from THF. The PNT resulting from the catalyst (1) shows bi‐models of GPC bands (Mn= 4236 and 66317), two glass transition temperatures (Tg = 72.7 and 201.5 °C), as well as two decomposition temperatures (Td = 337 and 460 °C).
Antiwear, Antiseize and Antioxidising Properties of Operation‐Conservation Oils Modified with Organometal Oil‐Soluble Additives Containing Nitrogen and Oxygen
Authors: Petkov Petko , Dimitrova Milena , Jordanov Dobromir 
Published: May 2015

AbstractThe present work aims at studying the antiwear, antiseize and antioxidising properties of anode‐shielding corrosion inhibitors. The physicochemical properties of the inhibitors and those of the operation‐conservation motor oils modified with them were determined. It was found that these inhibitors improve the antiwear, antiseize and antioxidising properties of the motor oils obtained. Real‐life experiments were carried out with a four‐stroke four‐cylinder engine (“Skoda” Czech Republic) mounted on a 30‐ton fishing barge which uses diesel fuel containing up to 1,4% sulphur. The antiwear and antioxidising properties of the oils obtained were determined, and a probable action mechanism of the complex corrosion inhibitors was suggested.
Langmuir‐Blodgett Films of Alkanethiolate Gold Nanorods
Authors: Lin Chia‐Chen , Chau Lai‐Kwan , Chang Ser‐Sing , Wang C. R. Chris 
Published: May 2015

AbstractColloidal multilayers of octadecanethiol‐capped Au nanorods were prepared using the Langmuir‐Blodgett technique. Uniform growth of the films with increasing number of deposition has been observed. Vertical transfer efficiency indicates efficient transfer for immersion of hydrophobic substrates and poor transfer for emersion of such substrates. The vertically transferred film has an order parameter S = 0.027, which suggests that the orientation of the nanorods in the film is somewhat isotropic about the dipping direction. Horizontal transfer of the Langmuir monolayer on Formvar/carbon‐coated Cu grids, however, gave scattered domains of Au nanorods aligned in parallel stacks. Such behavior is probably related to the rigidity of the Langmuir monolayer.
Solid Supported Reaction of Substituted 2‐Oxazoline with Amines under Microwave Irradiation
Authors: Kidwai Mazaahir , Mohan Richa 
Published: May 2015

Abstract1,2‐Diaryl‐4‐phenylmethylene‐2‐imidazolin‐5‐ones were obtained by the interaction of primary amines with 2‐phenyl‐4‐phenylmethylene‐2‐oxazolin‐5‐one using acidic alumina or montmorillonite K10 clay under microwave irradiation (MWI). The same reaction over basic alumina gave arylamides of α‐arylamido‐β‐arylacrylic acids in good yield. Usage of acidic alumina for cyclization gave better results in comparison with clay. This procedure highlights the versatility of various solid supports.
Ab Initio Study on the Potential Energy Surfaces of B4 Cluster
Authors: Li Qian Shu , Jin Hong Wei 
Published: May 2015

AbstractThe singlet and triplet potential energy surfaces (PES) for the isomerization and dissociation reactions of B4 isomers have been investigated using ab initio methods. Ten B4 isomers have been identified and of these 10 species, 4 have not been reported previously. The singlet rhombic structure 11 is found to be the most stable on the B4 surface, in agreement with the results of previous reports. Several isomerization and dissociation pathways have been found. On the singlet PES, the linear 13b can rearrange to rhombus 11 directly, while 13c rearranges to 11 through two‐step reactions involving a cyclic intermediate. On the triplet PES, the capped triangle structure 32 undergoes ring opening to the linear isomer 33b with a barrier of 34.8 kcal/mol and 44.9 kcal/mol, and the latter undergoes ring closure to the square structure 31 with a barrier of 30.4 kcal/mol and 33.0 kcal/mol at the MP4/6–311+G(3df)//MP2/6–311G(d) and CCSD/aug‐cc‐pVTZ//MP2/6–311G(d) levels of theory, respectively. The direct decomposition of singlet B4 yielding to B3+B is shown to have a large endothermicity of 87.3 kcal/mol (CCSD), and that producing 2B2 to have activation energy of 133.4 kcal/mol (CCSD).
Cyclohexene Reactivity Using Catalysts Containing Pt, Re and PtRe Supported on Na‐ and H‐Mordenite
Authors: Aboul‐Fotouh Sameh M. 
Published: May 2015

AbstractThe reactivity of cyclohexene (CHE) over catalysts containing 0.3 wt% Pt, 0.3 wt% Re or 0.3 wt% Pt + 0.3 wt% Re supported on Na‐ and H‐mordenite has been studied in an atmospheric flow‐type reactor at a temperature range of 100–400 °C, using a flow of hydrogen (20 cm3/min). The catalysts were characterized for acid sites strength‐distribution, using desorption of ammonia in DSC. The acidity of H‐mordenite (HM) is attributed to strong acid sites, whereas the acidity of Na‐mordenite (NaM) is due to weak acid sites which are not involved in the catalytic reaction under study. The catalysts containing HM enhance the reactivity of CHE for isomorization reactions. However, the reactivity of CHE on NaM catalysts enhances only the hydrogenation and dehydrogenation reactions. Pt/HM is the most selective catalyst for isomerization of CHE, whereas Pt/NaM and PtRe/NaM catalysts are the most selective for hydrogenation and dehydrogenation reactions, respectively. The hydroisomorization of CHE seems to depend only on the acidity of the catalysts, whereas both hydrogenation and dehydrogenation reactions were controlled by metallic function of the catalysts.
Studies on the Mass Spectra of Monocyclic N‐Aryl‐δ‐Valerolactams
Authors: Wang Eng‐Chi , Huang Keng‐Shiang , Lin Kuo‐Fan , Chen Shing‐Ming , Wang Li‐Fun 
Published: May 2015

AbstractThe fragmental behavior of some monocyclic N‐aryl‐δ‐valerolactams in EI‐MS was studied. Their molecular ion peak, together with some characteristic fragments such as [M‐29]+, [M‐56]+•, [M‐69]+, and [M‐98]+, were always found in a series of N‐aryl‐δ‐valerolactams in EI‐MS spectra. Furthermore, the mechanism for the interpretation of each fragment is described.
Synthesis of New Fused and Spiro 1,5‐Benzodiazepines
Authors: Khodairy A. , Abdel‐Ghany H. , El‐Sayed A. M. , Salah H. 
Published: May 2015

Abstract[1,3‐Dihydro‐4‐phenyl(1,5)benzodiazepin‐2‐ylidene]malononitrile 1a was treated with formaline and some different primary amines to give the corresponding pyrimido(1,5)benzodiazepines 2a–d. Treatment of compound 1a with halo reagents yielded the corresponding pyrrolobenzodiazepines 3a,b. The reaction of compound 1a with active methylenes, bidentates, S,S‐ and N,S‐acetals afforded the corresponding spiro(1,5)‐benzodiazepines 4a‐c–8a,b, respectively.
Chemical Constituents from the Root Bark of Formosan Zanthoxylum Ailanthoides
Authors: Cheng Ming‐Jen , Tsai Ian‐Lih , Chen Ih‐Sheng 
Published: May 2015

AbstractTwo new N‐isobutylamides, hydroxy lanyuamide I (1) and hydroxy lanyuamide II (2), together with one hundred and ten known compounds, have been isolated from the root bark of Formosan Zanthoxylum ailanthoides. These known compounds include twenty coumarins, twenty‐one benzo[c]phenanthridines, ten quinoline derivatives, one aporphine, one purine, seven amides, twelve benzenoids, one lactone, four flavonoids, nine lignans, eight steroids, two chlorophylls, eleven terpenoids and three other compounds, which were determined by means of spectral analyses.
Evaluation of Multicenter Electric Multipole Moment Integrals over Integer and Noninteger n‐STOs
Authors: Özdoǧan Telhat 
Published: May 2015

AbstractMulticenter electric multipole moment integrals over Slater type orbitals with integer and noninteger principal quantum numbers are expressed in terms of overlap integrals. The computer results for the integer case agree best with the prior literature. The accuracy of the computer results for noninteger case is not compared with the literature due to the lack of relevant literature, but the limit of the noninteger case is compared with the integer case and good agreement is achieved for wide changes in the relevant molecular parameters.
Catalytic Oxidation of Methane to C2‐C4 Hydrocarbons over CeO2 Promoted W‐Mn/SiO2 Catalysts at Higher Pressure
Authors: Chou Lingjun , Cai Yingchun , Zhang Bing , Niu Jianzhong , Ji Shengfu , Li Shuben 
Published: May 2015

AbstractCeO2‐promoted Na‐Mn‐W/SiO2 catalyst has been studied for catalytic oxidation of methane in a micro‐stainless‐steel reactor at elevated pressure. The effect of operating conditions, such as GHSV, pressure and CH4/O2 ratio, has been investigated. 22.0% CH4 conversion with 73.8% C2‐C4 selectivity (C2/C3/C4 = 3.8/1.0/3.6) was obtained at 1003 K, 1.5 × 105 h−;1 GHSV and 1.0 MPa. The results show: Elevated pressure disadvantages the catalytic oxidation of methane to C2‐C4 hydrocarbons. Large amounts of C3 and C4 hydrocarbons are observed. The unfavorable effects of elevated pressure can be overcome by increasing GHSV; the reaction is strongly dependent on the operating conditions at elevated pressure, particularly dependent on GHSV and ratio of CH4/O2. Analyses by means of XRD, XPS and CO2‐TPD show that CO2 produced from the reaction makes a weakly poisoning capacity of the catalyst; information of changeful valence on Ce and Mn was detected over the near‐surface of the Ce‐Na‐W‐Mn/SiO2 catalyst; the existence of Ce3+/Ce4+ and Mn2+/Mn3+ ion couple supported that the reaction over the catalyst followed the Redeal‐Redox mechanism. Oxidative re‐coupling of C2H6 and CH4 in gas phase or over surface of catalyst produces C3 or C4 hydrocarbons.
Synthesis of New Fused and Spiro Heterocyclic Systems from 3,5‐Pyrazolidinediones
Authors: Abdel‐Rahman M. A. , Khodairy A. , Ghattas A.‐B. A. G. , Younes S. 
Published: May 2015

Abstract4‐Bromo‐1‐phenyl‐3,5‐pyrazolidinedione 2 reacted with different nucleophilic reagents to give the corresponding 4‐substituted derivatives 3–8. The cyclized compounds 9–11 were achieved on refluxing compounds 3, 4 or 6a in glacial acetic acid or diphenyl ether. 4,4‐Dibromo‐1‐phenyl‐3,5‐pyrazolidinedione 12 reacted with the proper bidentates to give the corresponding spiro 3,5‐pyrazolidinediones 13–15, respectively. The 4‐aralkylidine derivatives 16a‐c, were subjected to Mannich reaction to give Mannich bases 17a‐c‐22a‐c, respectively. 4‐(p‐Methylphenylaminomethylidine)‐1‐phenyl‐3,5‐pyrazolidinedione 23 or 4‐(p‐methylphenylazo)‐1‐phenyl‐3,5‐pyrazolidinedione 29 were prepared and reacted with active nitriles, cyclic ketones and N,S‐acetals to give pyrano[2,3‐c]pyrazole, pyrazolo[4′,3′:5,6]pyrano[2,3‐c]pyrazole, spiropyrazole‐4,3′‐pyrazole and spiropyrazole‐4,3′‐[1,2,4]triazolane derivatives 24–34, respectively.
Potent Antipsoriatic Agents: A Facile Preparation of Acylated Derivatives from Dithranol in a Mild Basic Reaction
Authors: Liang David Woei‐Ming , Du Chun‐Jian 
Published: May 2015

AbstractTreatment of dithranol 1 with various equivalents of acetyl chloride and Et3N in THF at room temperature afforded the corresponding acylated derivatives, such as 1‐acetyloxy‐ and 1,8‐diacetyloxy‐9(10H)‐anthracenones, 6a, and 6b, as well as 1,8,9‐triacetyloxyanthracene 7a, and 1,8,9‐triacetyloxy‐10‐acetylanthracene 7b. 1,8‐Bis(trimethylacetyloxy)‐9(10H)‐anthracenone 6c was also obtained in high yield by using pivaloyl chloride during the mild acylation.
Syntheses of Hitherto Unknown Thiazole, Ylidene and Pyridinethione Derivatives Having a Piperidin‐1‐yl Moiety and Their Use as Antimicrobial Agents
Authors: El‐Gaby Mohamed Sayed A. 
Published: May 2015

AbstractThe novel hydrazone derivatives 2a‐c were prepared by treatment of aldehydes 1a,b with some hydrazines. Thiocarbamoyl functional group in compound 2a was subjected to cyclization reactions with some α‐halocarbonyl reagents and furnished the novel thiazoles 4‐6, 8 and 9. Enaminonitrile 10 and pyridinone 13 derivatives were synthesized by interaction of active methylene compound 2b with N,N‐dimethylformamide‐dimethylacetal and ketene dithioacetal 11, respectively. Aliphatic, aromatic and heteroaromatic active methylene compounds were condensed with aldehydes 1a,b to afford the new ylidenes 15a‐d, 19a,b, 20 and 21. Substituted pyridinethiones 22 and 23 were prepared in high yields by cyclocondensation of 15c with malononitrile and ethyl cyanoacetate, respectively. Indeno[1,2‐b]pyridines 26a,b were obtained by the reaction of ylidenes 19a,b with cyanothioacetamide in ethanol and in the presence of sodium ethoxide under reflux. The structures of the synthesized compounds were established from their analytical and spectral data. The prepared compounds were also screened for their antimicrobial activity.
Synthesis, Reactions and Antimicrobial Activity of Some New Indolyl‐1,3,4‐Oxadiazole, Triazole and Pyrazole Derivatives
Authors: Abdel‐Rahman  , Farghaly A. H. 
Published: May 2015

AbstractIndole‐3‐carboxylic acid hydrazide 3 was prepared and was treated with aromatic aldehydes in ethanol to give the corresponding hydrazone derivatives 4–7 in good yields. The indole carbohydrazide was incorporated into the 3‐indolyloxadiazoles 8–11 and 18, 3‐indolyltriazoles 13–17 and 35, 3‐indolylpyrazole derivatives 19–23 and carbamate derivatives 26–27. Furthermore, interaction of the carboazide 24 with hydrazine hydrate in refluxing toluene afforded the corresponding semicarbazide derivative 30. The thiadiazine derivative 34 was also prepared. Some of these compounds were screened in vitro for their antibacterial and antifungal activity.
Synthesis of 3‐Halogenated Flavonoids via Electrophile‐Promoted Cyclization of 2‐(3‐Aryl‐2‐propynoyl)anisoles
Authors: Lin Chi‐Fong , Duh Tsai‐Hui , Lu Wen‐Der , Lee Jeng‐Lin , Lee Chia‐Ying , Chen Chin‐Chau , Wu Ming‐Jung 
Published: May 2015

AbstractTreatment of 2‐(1‐aryl‐3‐propynoyl) anisoles 1 with N‐chlorosuccinimide (NCS) or N‐bromosuccinimide (NBS) gave the 3‐halogenated flavones and their related molecules in moderate yields.
A Sensitive Spectrophotometric Determination of Nitrite in Water and Soil
Authors: Chatterjee Sukumar , Pillai Ajai K. , Gupta V. K. 
Published: May 2015

AbstractA highly sensitive spectrophotometric method for the determination of nitrite in water and soil has been developed. The reaction of nitrite with acidified potassium iodide to liberate iodine which oxidizes leuco‐crystal violet (LCV) to form crystal violet having absorption maxima at 590 nm forms the bases of this method. In aqueous medium the system obeys Beer's law in the range of 0.1 to 1.0 μg per 25 mL (0.004–0.04 ppm), while in an extractive system the range is 0.025–0.25 μg in 100 mL (0.00025–0.0025 ppm). The molar absorptivity and Sandell's sensitivity were found to be 1.54 × 106 1 mol−1 cm−1 and 44 pg cm−2, respectively.
Pregnane‐Based Steroids from a Formosan Gorgonian Subergorgia Mollis
Authors: Wu Shwu‐Li , Wang Guey‐Horng , Dai Chang‐Feng , Sheu Jyh‐Horng 
Published: May 2015

AbstractA new steroid, 11α, 15α‐diacetoxy‐17α‐pregna‐4,20‐dien‐3‐one (1), and a known one, 17α‐pregna‐4,20‐dien‐3‐one (2), have been isolated from a Formosan gorgonian Subergorgia mollis. The structures of both compounds were determined on the basis of extensive NMR experiments, including HMQC, HMBC, 1H‐1H COSY and NOESY. Metabolite 2 has not been isolated from a natural source before. The detailed 1H and 13C NMR spectral data of 2 are reported for the first time.
DNA‐Surfactant Interactions. Compaction, Condensation, Decompaction and Phase Separation
Authors: Dias Rita , Rosa Mónica , Pais Alberto Canelas , Miguel Maria , Lindman Björn 
Published: May 2015

AbstractRecent investigations of the interaction between DNA and alkyltrimethylammonium bromides of various chain lengths are reviewed. Several techniques have been used such as phase map determinations, fluorescence microscopy, and electron microscopy. Dissociation of the DNA‐surfactant complexes, by the addition of anionic surfactant, has received special attention.Precipitation maps for DNA‐cationic surfactant systems were evaluated by turbidimetry for different salt concentrations, temperatures and surfactant chain lengths. Single‐stranded DNA molecules precipitate at lower surfactant concentrations than double‐helix ones. It was also observed that these systems precipitate for very low concentrations of both DNA and surfactant, and that the extension of the two‐phase region increases for longer chain surfactants; these observations correlate well with fluorescence microscopy results, monitoring the system at a single molecule level.Dissociation of the DNA‐cationic surfactant complexes and a concomitant release of DNA was achieved by addition of anionic surfactants. The unfolding of DNA molecules, previously compacted with cationic surfactant, was shown to be strongly dependent on the anionic surfactant chain length; lower amounts of a longer chain surfactant were needed to release DNA into solution. On the other hand, no dependence on the hydrophobicity of the compacting agent was observed. The structures of the aggregates formed by the two surfactants, after the interaction with DNA, were imaged by cryogenic transmission electron microscopy. It is possible to predict the structure of the aggregates formed by the surfactants, like vesicles, from the phase behaviour of the mixed surfactant systems.The compaction of a medium size polyanion with shorter polycations was furthermore studied by means of Monte Carlo simulations. The polyanion chain suffers a sudden collapse as a function of the condensing agent concentration and of the number of charges on the molecules. Further increase of the concentration gives an increase of the degree of compaction. The compaction was found to be associated with the polycations promoting bridging between different sites of the polyanion. When the total charge of the polycations was lower than that of the polyanion, a significant translational motion of the compacting agent along the polyanion was observed, producing only a small‐degree of intrachain segregation. However, complete charge neutralization was not a prerequisite to achieve compacted forms.
Synthesis and Spectroscopic Characterization of Some Ferrocenyl Schiff Bases Containing Pyridine Moiety and Their Complexation with Cobalt, Nickel, Copper and Zinc
Authors: Abd‐Elzaher Mokhles M. 
Published: May 2015

AbstractThree novel ferrocenyl Schiff base ligands containing pyridine moiety have been formed by 1:2 molar condensation of 1,1′‐diacetylferrocene with 2‐aminopyridine, 2‐amino‐5‐picoline or 2‐amino‐5‐chloropyridine, respectively. The ligands are 1,1′‐bis[1‐(pyridyl‐2‐imino)‐ethyl]ferrocene (L1); 1,1′‐bis[1‐(5‐methyl‐pyridyl‐2‐imino)ethyl]ferrocene (L2) and 1,1′‐bis[1‐(5‐chloropyridyl‐2‐imino)ethyl]ferrocene (L3). These ligands form 1:1 complexes with Co(II), Cu(II), Ni(II) and Zn(II) ions. The prepared ligands and their complexes have been characterized by IR, 1H NMR, 13C NMR, UV/Vis spectra as well as elemental analysis. The spectral data of the ligands and their complexes are discussed in connection with the structural changes due to complexation.
Flavones and Cytotoxic Constituents from the Stem Bark of Muntingia Calabura
Authors: Chen Jih‐Jung , Lin Ru‐Wei , Duh Chang‐Yih , Huang Hung‐Yi , Chen Ih‐Sheng 
Published: May 2015

AbstractTwo new flavones, 8‐hydroxy‐7,3′,4′,5′‐tetramethoxyflavone and 8,4′‐dihydroxy‐7,3′,5′‐trimethoxyflavone, together with thirteen known compounds have been isolated from the stem bark of Muntingia calabura. The structures of two new compounds were determined through spectral analyses. Among the isolates, 8‐hydroxy‐7,3′,4′,5′‐tetramethoxyflavone, 8,4′‐dihydroxy‐7,3′,5′‐trimethoxyflavone, and 3‐hydroxy‐1‐(3,5‐dimethoxy‐4‐hydroxyphenyl)propan‐1‐one exhibited effective cytotoxicities (ED50 values = 3.56, 3.71, and 3.27 μg/mL, respectively) against the P‐388 cell line in vitro.
Treated Rice Bran for Scavenging Cr(III) and Hg(II) from Acidic Solution
Authors: Farajzadeh Mir Ali , Monji Akbar Boviery 
Published: May 2015

AbstractThe purpose of this study was to examine the efficiency with which rice bran (treated or untreated) removes heavy metals, especially Cr(III) and Hg(II), from acidic solution. Sorption assays were done in shaken flasks in the presence of rice bran. Different experimental conditions such as pH, volume of solution, bran weight, particle size, exchange time and stirring time were improved. The efficiency of bran was studied before and after treatments. For treatment, solutions of acid, alkali and salt were used. The results show that after treating with 4 M sodium chloride solution, its efficiency in removal of Cr(III) and Hg(II) was improved. Kinetic measurements of chromium and mercury removal by bran have revealed that sorption equilibrium was obtained after 10 min of contact. Sorption experiments done with various granulometric fractions of rice bran have shown that this sorbent has the same efficiencies in meshes higher than 20. Further research is necessary in order to determine a mechanism for cations removal by the bran. It is mentioned that the process of making polished rice from brown rice discharges rice bran; therefore, it is very inexpensive, with a cost of 1/50 − 1/40 of that of synthetic sorbent, and thus its use would significantly lower the cost of wastewater treatment.