Colloids and Surfaces A-physicochemical and Engineering Aspects, 2008
A new inorganic cation exchanger titanium(IV) molybdosilicate has been synthesized. The effect of... more A new inorganic cation exchanger titanium(IV) molybdosilicate has been synthesized. The effect of experimental parameters such as mixing ratio of reagents, temperature, and pH on the properties of material has been studied. The material was characterized on the basis of chemical ...
... Titre du document / Document title. Synthesis, ion-exchange properties, and analytical applic... more ... Titre du document / Document title. Synthesis, ion-exchange properties, and analytical applications of anilinium tin(IV) phosphate. Auteur(s) / Author(s). DHRUV KUMAR SINGH (1) ; ANJANA DARBARI ; Affiliation(s) du ou des auteurs / Author(s) Affiliation(s). ...
The adsorption behavior of a thermally and chemically stable hybrid ion-exchange material, acryla... more The adsorption behavior of a thermally and chemically stable hybrid ion-exchange material, acrylamide aluminum tungstate was explored in cationic (CTAB) and anionic (SDS) surfactants and acidic solvents. Critical micellar concentration (CMC) appears to be an important parameter in determining the adsorption behavior of metal ions. Equilibration time and temperature studies on the distribution coefficient of metal ions were studied. On the basis of the distribution coefficient, this material was successfully used for quantitative separations of some binary synthetic mixtures of metal ions by the column method. Hg(II) ion was selectively determined quantitatively in synthetic mixture. The material appears to be promising for separating toxic metal ions in a real matrix (industrial effluents and waste water) and can be utilized as a packing material in HPLC and GC columns for faster and more efficient separation.
Colloids and Surfaces A-physicochemical and Engineering Aspects, 2007
A new crystalline cation-exchanger aluminium tungstate was synthesized by mixing solutions of 0.1... more A new crystalline cation-exchanger aluminium tungstate was synthesized by mixing solutions of 0.1 M aluminium nitrate and 0.1 M sodium tungstate at pH 1.2. The ion-exchange capacity of the material was found 1.17 meq g −1 (for Na + ). The K d values for some alkaline and transition metal ions were performed in 0.1 M HNO 3 and TritonX-100 (non ionic surfactant) solvent systems by batch process. Some important and analytically difficult quantitative and selective separations were achieved by using the packed column of this cation-exchange material column. Ion-exchange equilibria of alkaline and transition metal ions and thermodynamic parameters viz. equilibrium constant (K a ), values of standard Gibbs free energy change ( G • ), standard enthalpy change ( H • ), and standard entropy change ( S • ) were determined on this ion-exchange material. The effect of temperature on ion-exchange isotherm of alkaline earth metal ions (Mg 2+ , Ca 2+ , Sr 2+ , Ba 2+ )/H + systems and transition metal ions (Fe 2+ , Co 2+ , Ni 2+ , Cu 2+ )/H + systems were studied at different temperatures 30, 40, 50, and 60 • C. The selectivity coefficients at constant ionic strength (0.03 mol/kg) for alkaline and transition metal ions were also evaluated.
Stannic silicomolybdate was synthesized at pH 0.63 .The experimental parameters such as order of ... more Stannic silicomolybdate was synthesized at pH 0.63 .The experimental parameters such as order of mixing, mixing volume ratio, pH, stirring time, drying temperature were established for the synthesis of the material. The ion exchange capacity of Ca 2+ was improved from 0.53 to 1.73 meq/g for this newly synthesized material. The reproducibility of the product formed was checked. The exchanger was characterized on the basis of chemical composition, thermal and chemical stability, FTIR, TGA, DSC, X-ray and SEM analysis. The scanning electron microscopy of the material shows a regular diamond shape morphology. The presence of uniform morphology also indicated the absence of impure phases. The X-ray diffraction study showed the amorphous nature. Distribution coefficient studies of the metal ions on this material were performed in solvents having different acid dissociation constants namely trichloroacetic acid, formic acid and acetic acid. The effect of dielectric constants of solvents was studied by using dimethylsulfoxide; formic acid, acetic acid and trichloroacetic acid. The effect of temperature on the distribution coefficient was explored. It was finally concluded that 45°C appeared to be the most favorable temperature. Important quantitative separations of metal ions in ternary mixtures included Ni 2+ -Co 2+ -Pb 2+ , Cu 2+ -Cr 3+ -Pb 2+ , Cu 2+ -Fe 3+ -Pb 2+ , Th 4+ -Zr 4+ -Sn 4+ , Cr 3+ -Ni 2+ -Fe 3+ , Cu 2+ -Ni 2+ -Ag + and Fe 3+ -Zn 2+ -Al 3+ . The practical potential of stannic silicomolybdate was explored by separating Cu 2+ and Zn 2+ quantitatively in synthetic mixtures as well as in commercially available brass samples.
Colloids and Surfaces A-physicochemical and Engineering Aspects, 2009
A crystalline organic-inorganic composite exchanger, acrylamide stannic silicomolybdate was synth... more A crystalline organic-inorganic composite exchanger, acrylamide stannic silicomolybdate was synthesized at pH 0.63. The ion exchange capacity of the material was improved from 0.40 to 1.64 meq/g in comparison to its inorganic counterpart, stannic silicomolybdate. The FTIR, XRD and thermal studies were conducted to understand the nature of the material. Distribution coefficient studies of the metal ions on this material were performed in polar solvents such as trichloroacetic acid, formic acid, acetic acid and dimethylsulfoxide to know the ion exchange behavior and selectivity for different ions. On the basis of distribution coefficient studies, several binary separations of metal ions viz. Cd 2+ -Pb 2+ , Cd 2+ -Cu 2+ , Al 3+ -Pb 2+ , Al 3+ -Cu 2+ , Zn 2+ -Pb 2+ , Zn 2+ -Cu 2+ was achieved quantitatively on acrylamide stannic silicomolybdate columns. Pb 2+ and Cu 2+ were selectively removed from synthetic mixtures containing Cu 2+ , Mg 2+ , Cd 2+ , Hg 2+ , Zn 2+ and Ba 2 and Pb 2+ , Hg 2+ , Cd 2+ , Ba 2+ , Mg 2+ and Ba 2+ respectively. The quantitative separation of Cu 2+ and Zn 2+ were also achieved on commercially available pharmaceutical formulation I-Vit.
Cation exchange resin, Amberlite IR-120, has been modified by the sorption of 1-(2-pyridylazo)-2-... more Cation exchange resin, Amberlite IR-120, has been modified by the sorption of 1-(2-pyridylazo)-2-napthol (PAN) at pH 6.0. The optimum conditions for the sorption of PAN on the resin have been established. The maximum sorption of PAN was found to be 8.70 μmol/g. In order to explore the separation possibilities of the material, distribution coefficients of a number of metal ions were determined in various solvent systems. A number of binary separations of metal ions of analytical interest have been carried out using columns packed with this material. In order to demonstrate the practical utility of this material, Zn2+ and Hg2+ have been selectively separated from synthetic mixtures of metal ions and assay of Zn2+ and Fe2+ in commercially available pharmaceutical tablets; namely Fesofor-Z and FE-Z, was carried out.
Samples of zirconium(IV)iodotungstate have been synthesized under varying mixing order and ratios... more Samples of zirconium(IV)iodotungstate have been synthesized under varying mixing order and ratios of aqueous solution of potassium iodate, sodium tungstate and zirconium oxychloride at pH 1. A tentative formula was proposed on the basis of chemical composition, FTIR and thermogravimetric studies. The material shows a capacity of 0.68 meq g(-1) (for K+) which can be retained up to 200 degrees C. pH titration data reveal its monofunctional behavior. The distribution coefficient values of metal ions have been determined in various solvent systems. A number of important and analytically difficult quantitative separations of metal ions have been achieved using columns packed with this exchanger. In order to demonstrate practical utility of this material, Hg2+ and Pb2+ have been selectively separated and determined in the synthetic mixtures. Assay of Al3+ and Mg2+ in commercial tablets and analysis of lead in the standard reference material have also been attempted.
crystals of a new hybrid compound, (C5H6N2O)2[Co(H2O)6]3(SO4)4.2H2O, were synthesized in aqueous ... more crystals of a new hybrid compound, (C5H6N2O)2[Co(H2O)6]3(SO4)4.2H2O, were synthesized in aqueous solution and characterized. This compound crystallizes in the triclinic system with the space group P-1, the unit cell :a=6.632(3) Å, b=11.769(5) Å, c=14.210(6) Å, α=67.86(4)°, β=81.32(4)°, γ=85.18(4)° and V=1015.14(8) Å 3 . Its crystal structure can be described as a packing of alternated inorganic and organic layers. The different components are connected by a threedimensional network of O-H…O and N-H…O hydrogen bonds.
New ceramic multilayer membranes with a top layer of Tunisian natural illite clay were prepared. ... more New ceramic multilayer membranes with a top layer of Tunisian natural illite clay were prepared. The illite powder (fine fraction less than 2 µm in size) was isolated by sedimentation from crude clay. The obtained powders of a specific surface area of 160 m 2 g -1 were analyzed by X-ray diffraction (XRD). It was found that the principal material of this sample was illite. The deposition of the ultrafiltration layer occurred by slip casting method on a clay microfiltration layer using aqueous colloidal suspension. After drying at room temperature for 24 h, the ultrafiltration layer was heated to 800°C. SEM analyses showed that very thin defect-free top layers were formed. The layer thickness increased with dipping time but could be limited to a few micrometer (4.82 µm). The membrane was further tested for ultrafiltration of dextran polymer solution of different molecular weights. The membrane cutoff was of 185 KDa and the water permeability was equal to 88 l.h -1 m -2 bar -1 .
Colloids and Surfaces A-physicochemical and Engineering Aspects, 2006
Anion exchange resin Amberlite IR-400 has been modified with napthol blueblack. Effect of concen... more Anion exchange resin Amberlite IR-400 has been modified with napthol blueblack. Effect of concentration, time, pH and temperature on the sorption of dye has been studied. The uptake sequence of various metal ions in a number of solvents has been determined. On the ...
Abstract The adsorption of different metal ions on acrylamidezirconium (IV) arsenate has been stu... more Abstract The adsorption of different metal ions on acrylamidezirconium (IV) arsenate has been studied. The effect of surfactant concentration (Tween 80‐R and Tritron X‐100) on sorption of different metal ions acrylamidezirconium (IV) arsenate was explored. The effect ...
Colloids and Surfaces A-physicochemical and Engineering Aspects, 2008
A new inorganic cation exchanger titanium(IV) molybdosilicate has been synthesized. The effect of... more A new inorganic cation exchanger titanium(IV) molybdosilicate has been synthesized. The effect of experimental parameters such as mixing ratio of reagents, temperature, and pH on the properties of material has been studied. The material was characterized on the basis of chemical ...
... Titre du document / Document title. Synthesis, ion-exchange properties, and analytical applic... more ... Titre du document / Document title. Synthesis, ion-exchange properties, and analytical applications of anilinium tin(IV) phosphate. Auteur(s) / Author(s). DHRUV KUMAR SINGH (1) ; ANJANA DARBARI ; Affiliation(s) du ou des auteurs / Author(s) Affiliation(s). ...
The adsorption behavior of a thermally and chemically stable hybrid ion-exchange material, acryla... more The adsorption behavior of a thermally and chemically stable hybrid ion-exchange material, acrylamide aluminum tungstate was explored in cationic (CTAB) and anionic (SDS) surfactants and acidic solvents. Critical micellar concentration (CMC) appears to be an important parameter in determining the adsorption behavior of metal ions. Equilibration time and temperature studies on the distribution coefficient of metal ions were studied. On the basis of the distribution coefficient, this material was successfully used for quantitative separations of some binary synthetic mixtures of metal ions by the column method. Hg(II) ion was selectively determined quantitatively in synthetic mixture. The material appears to be promising for separating toxic metal ions in a real matrix (industrial effluents and waste water) and can be utilized as a packing material in HPLC and GC columns for faster and more efficient separation.
Colloids and Surfaces A-physicochemical and Engineering Aspects, 2007
A new crystalline cation-exchanger aluminium tungstate was synthesized by mixing solutions of 0.1... more A new crystalline cation-exchanger aluminium tungstate was synthesized by mixing solutions of 0.1 M aluminium nitrate and 0.1 M sodium tungstate at pH 1.2. The ion-exchange capacity of the material was found 1.17 meq g −1 (for Na + ). The K d values for some alkaline and transition metal ions were performed in 0.1 M HNO 3 and TritonX-100 (non ionic surfactant) solvent systems by batch process. Some important and analytically difficult quantitative and selective separations were achieved by using the packed column of this cation-exchange material column. Ion-exchange equilibria of alkaline and transition metal ions and thermodynamic parameters viz. equilibrium constant (K a ), values of standard Gibbs free energy change ( G • ), standard enthalpy change ( H • ), and standard entropy change ( S • ) were determined on this ion-exchange material. The effect of temperature on ion-exchange isotherm of alkaline earth metal ions (Mg 2+ , Ca 2+ , Sr 2+ , Ba 2+ )/H + systems and transition metal ions (Fe 2+ , Co 2+ , Ni 2+ , Cu 2+ )/H + systems were studied at different temperatures 30, 40, 50, and 60 • C. The selectivity coefficients at constant ionic strength (0.03 mol/kg) for alkaline and transition metal ions were also evaluated.
Stannic silicomolybdate was synthesized at pH 0.63 .The experimental parameters such as order of ... more Stannic silicomolybdate was synthesized at pH 0.63 .The experimental parameters such as order of mixing, mixing volume ratio, pH, stirring time, drying temperature were established for the synthesis of the material. The ion exchange capacity of Ca 2+ was improved from 0.53 to 1.73 meq/g for this newly synthesized material. The reproducibility of the product formed was checked. The exchanger was characterized on the basis of chemical composition, thermal and chemical stability, FTIR, TGA, DSC, X-ray and SEM analysis. The scanning electron microscopy of the material shows a regular diamond shape morphology. The presence of uniform morphology also indicated the absence of impure phases. The X-ray diffraction study showed the amorphous nature. Distribution coefficient studies of the metal ions on this material were performed in solvents having different acid dissociation constants namely trichloroacetic acid, formic acid and acetic acid. The effect of dielectric constants of solvents was studied by using dimethylsulfoxide; formic acid, acetic acid and trichloroacetic acid. The effect of temperature on the distribution coefficient was explored. It was finally concluded that 45°C appeared to be the most favorable temperature. Important quantitative separations of metal ions in ternary mixtures included Ni 2+ -Co 2+ -Pb 2+ , Cu 2+ -Cr 3+ -Pb 2+ , Cu 2+ -Fe 3+ -Pb 2+ , Th 4+ -Zr 4+ -Sn 4+ , Cr 3+ -Ni 2+ -Fe 3+ , Cu 2+ -Ni 2+ -Ag + and Fe 3+ -Zn 2+ -Al 3+ . The practical potential of stannic silicomolybdate was explored by separating Cu 2+ and Zn 2+ quantitatively in synthetic mixtures as well as in commercially available brass samples.
Colloids and Surfaces A-physicochemical and Engineering Aspects, 2009
A crystalline organic-inorganic composite exchanger, acrylamide stannic silicomolybdate was synth... more A crystalline organic-inorganic composite exchanger, acrylamide stannic silicomolybdate was synthesized at pH 0.63. The ion exchange capacity of the material was improved from 0.40 to 1.64 meq/g in comparison to its inorganic counterpart, stannic silicomolybdate. The FTIR, XRD and thermal studies were conducted to understand the nature of the material. Distribution coefficient studies of the metal ions on this material were performed in polar solvents such as trichloroacetic acid, formic acid, acetic acid and dimethylsulfoxide to know the ion exchange behavior and selectivity for different ions. On the basis of distribution coefficient studies, several binary separations of metal ions viz. Cd 2+ -Pb 2+ , Cd 2+ -Cu 2+ , Al 3+ -Pb 2+ , Al 3+ -Cu 2+ , Zn 2+ -Pb 2+ , Zn 2+ -Cu 2+ was achieved quantitatively on acrylamide stannic silicomolybdate columns. Pb 2+ and Cu 2+ were selectively removed from synthetic mixtures containing Cu 2+ , Mg 2+ , Cd 2+ , Hg 2+ , Zn 2+ and Ba 2 and Pb 2+ , Hg 2+ , Cd 2+ , Ba 2+ , Mg 2+ and Ba 2+ respectively. The quantitative separation of Cu 2+ and Zn 2+ were also achieved on commercially available pharmaceutical formulation I-Vit.
Cation exchange resin, Amberlite IR-120, has been modified by the sorption of 1-(2-pyridylazo)-2-... more Cation exchange resin, Amberlite IR-120, has been modified by the sorption of 1-(2-pyridylazo)-2-napthol (PAN) at pH 6.0. The optimum conditions for the sorption of PAN on the resin have been established. The maximum sorption of PAN was found to be 8.70 μmol/g. In order to explore the separation possibilities of the material, distribution coefficients of a number of metal ions were determined in various solvent systems. A number of binary separations of metal ions of analytical interest have been carried out using columns packed with this material. In order to demonstrate the practical utility of this material, Zn2+ and Hg2+ have been selectively separated from synthetic mixtures of metal ions and assay of Zn2+ and Fe2+ in commercially available pharmaceutical tablets; namely Fesofor-Z and FE-Z, was carried out.
Samples of zirconium(IV)iodotungstate have been synthesized under varying mixing order and ratios... more Samples of zirconium(IV)iodotungstate have been synthesized under varying mixing order and ratios of aqueous solution of potassium iodate, sodium tungstate and zirconium oxychloride at pH 1. A tentative formula was proposed on the basis of chemical composition, FTIR and thermogravimetric studies. The material shows a capacity of 0.68 meq g(-1) (for K+) which can be retained up to 200 degrees C. pH titration data reveal its monofunctional behavior. The distribution coefficient values of metal ions have been determined in various solvent systems. A number of important and analytically difficult quantitative separations of metal ions have been achieved using columns packed with this exchanger. In order to demonstrate practical utility of this material, Hg2+ and Pb2+ have been selectively separated and determined in the synthetic mixtures. Assay of Al3+ and Mg2+ in commercial tablets and analysis of lead in the standard reference material have also been attempted.
crystals of a new hybrid compound, (C5H6N2O)2[Co(H2O)6]3(SO4)4.2H2O, were synthesized in aqueous ... more crystals of a new hybrid compound, (C5H6N2O)2[Co(H2O)6]3(SO4)4.2H2O, were synthesized in aqueous solution and characterized. This compound crystallizes in the triclinic system with the space group P-1, the unit cell :a=6.632(3) Å, b=11.769(5) Å, c=14.210(6) Å, α=67.86(4)°, β=81.32(4)°, γ=85.18(4)° and V=1015.14(8) Å 3 . Its crystal structure can be described as a packing of alternated inorganic and organic layers. The different components are connected by a threedimensional network of O-H…O and N-H…O hydrogen bonds.
New ceramic multilayer membranes with a top layer of Tunisian natural illite clay were prepared. ... more New ceramic multilayer membranes with a top layer of Tunisian natural illite clay were prepared. The illite powder (fine fraction less than 2 µm in size) was isolated by sedimentation from crude clay. The obtained powders of a specific surface area of 160 m 2 g -1 were analyzed by X-ray diffraction (XRD). It was found that the principal material of this sample was illite. The deposition of the ultrafiltration layer occurred by slip casting method on a clay microfiltration layer using aqueous colloidal suspension. After drying at room temperature for 24 h, the ultrafiltration layer was heated to 800°C. SEM analyses showed that very thin defect-free top layers were formed. The layer thickness increased with dipping time but could be limited to a few micrometer (4.82 µm). The membrane was further tested for ultrafiltration of dextran polymer solution of different molecular weights. The membrane cutoff was of 185 KDa and the water permeability was equal to 88 l.h -1 m -2 bar -1 .
Colloids and Surfaces A-physicochemical and Engineering Aspects, 2006
Anion exchange resin Amberlite IR-400 has been modified with napthol blueblack. Effect of concen... more Anion exchange resin Amberlite IR-400 has been modified with napthol blueblack. Effect of concentration, time, pH and temperature on the sorption of dye has been studied. The uptake sequence of various metal ions in a number of solvents has been determined. On the ...
Abstract The adsorption of different metal ions on acrylamidezirconium (IV) arsenate has been stu... more Abstract The adsorption of different metal ions on acrylamidezirconium (IV) arsenate has been studied. The effect of surfactant concentration (Tween 80‐R and Tritron X‐100) on sorption of different metal ions acrylamidezirconium (IV) arsenate was explored. The effect ...
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