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Mu Naushad - One of the best experts on this subject based on the ideXlab platform.
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a biopolymer based hybrid cation Exchanger pectin cerium iv iodate synthesis characterization and analytical applications
Desalination and Water Treatment, 2014Co-Authors: Deepak Pathania, Mu Naushad, Gaurav Sharma, Vishal PriyaAbstract:AbstractPectin cerium(IV) iodate (PcCeI) and cerium(IV) iodate (CeI) cation ion exchange materials were synthesized via sol–gel methods. The materials were characterized by using Fourier transform infrared spectroscopy, X-ray diffractometer, thermogravimetric analysis, and scanning electron microscopy. The ion exchange capacity (IEC), thermal stability, distribution coefficient (Kd), and pH titrations were investigated to recognize the cation exchange behavior of the materials. The IEC of pectin-cerium(IV) iodate (PcCeI and cerium(IV) iodate CeI were reported as 1.80 meq/g and 0.92 meq/g, respectively. The higher distribution coefficient values of 250.01 and 219.14 mg/L confirmed the selectivity of pectin-cerium(IV) iodate hybrid ion Exchanger for As3+ and Zn2+. The antibacterial activity of synthesized ion Exchangers was explored for E. coli bacteria and observed relatively higher for PcCeI as compared to CeI.
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Forward ion-exchange kinetics of heavy metal ions on the surface of carboxymethyl cellulose Sn(IV) phosphate composite nano-rod-like cation Exchanger
Journal of Thermal Analysis and Calorimetry, 2012Co-Authors: Ali Mohammad, Arshi Amin, Mu Naushad, Gaber E. EldesokyAbstract:The Nernst–Planck equations with some additional assumptions was used in this study to investigate the forward kinetics and ion-exchange mechanism of heavy metal ions viz. Ni^2+–H^+, Cu^2+–H^+, Mn^2+–H^+ and Zn^2+–H^+ on the surface of carboxymethyl cellulose Sn(IV) phosphate composite nano-rod-like cation-Exchanger. It was observed that heavy metals' exchange processes were imparted by the particle diffusion-controlled phenomenon. Some physical parameters i.e., fractional attainment of equilibrium U ( τ ), self-diffusion coefficients ( D _o), energy of activation ( E _a), and entropy of activation (Δ S *) were estimated. These investigations revealed that the equilibrium is attained faster at higher temperature probably because of availability of thermally enlarged matrix of carboxymethyl cellulose Sn(IV) phosphate composite nano-rod-like cation-exchange material. The physical parameters observed for this composite cation Exchanger were also compared with other composite ion Exchangers. The results showed that the ion-exchange phenomenon is more feasible on the surface of this composite cation Exchanger as compared with the other ion Exchangers which indicated the usefulness of this composite ion Exchanger in various applications.
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synthesis and characterization of a new organic inorganic pb2 selective composite cation Exchanger acrylonitrile stannic iv tungstate and its analytical applications
Chemical Engineering Journal, 2009Co-Authors: Syed Ashfaq Nabi, Mu Naushad, Rani BushraAbstract:A new polymeric–inorganic cation Exchanger acrylonitrile stannic(IV) tungstate composite was synthesized by sol–gel technique by incorporating stannic(IV) tungstate precipitate with acrylonitrile. Composite materials formed by the combination of inorganic ion Exchangers of multivalent metal acid salts and organic polymers (acrylonitrile, cellulose acetate, polyaniline, polypyrrole, polythiophene, etc.), providing a new class of ‘organic–inorganic’ composite Exchangers with better mechanical and granulometric properties, good ion exchange capacity, higher stability, reproducibility and selectivity for heavy metals. The physico-chemical characterization was carried out by elemental analysis, TGA, SEM, XRD, FTIR and TEM studies. Ion exchange capacity, pH titrations, elution and distribution behavior were also carried out to understand the ion exchange behavior of the material. The adsorption behavior of heavy metal ions has been reported in nitric acid and two surfactants media by batch processes. The analytical applications of the material have been explored by achieving some analytically important binary separations from aqueous solution on its columns. The practical applicability of acrylonitrile stannic(IV) tungstate was demonstrated in the quantitative separation of Fe3+and Zn2+ contents of a commercially available pharmaceutical sample namely Fefol-Z.
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synthesis characterization and analytical applications of a new composite cation Exchanger cellulose acetate zr iv molybdophosphate
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2008Co-Authors: Syed Ashfaq Nabi, Mu NaushadAbstract:Abstract A new composite cation Exchanger cellulose acetate-Zr(IV) molybdophosphate was synthesized because composite materials formed by the combination of inorganic ion Exchangers of multivalent metal acid salts and organic polymers (cellulose acetate, polyaniline, polythiophene, polypyrrole, Nylon 6,6, etc.), providing a new class of ‘organic–inorganic’ composite ion Exchangers with better mechanical and granulometric properties, good ion exchange capacity, reproducibility, higher stability and selectivity for heavy metals. The physico-chemical properties of this material were determined using some instrumental analyses viz. FTIR, X-ray, TGA–DTA and SEM. Ion exchange capacity, pH titrations, elution and distribution behavior were also carried out to understand the ion exchange behavior of the material. Its selectivity was examined by achieving some important binary separations like Mg(II)–Ca(II), Zn(II)–Ca(III), Fe(III)–Cr(III), Zn(II)–Cr(III), Cd(II)–Hg(II), Cd(II)–Cr(III) on its column. This new Exchanger was offered a variety of technological opportunity for quantitative determination and separation of Cr 3+ from a synthetic mixture of metal ions and Ca 2+ from commercially available vitamin and minerals formulation namely Recovit.
Felix Studt - One of the best experts on this subject based on the ideXlab platform.
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exploring scaling relations for chemisorption energies on transition metal exchanged zeolites zsm 22 and zsm 5
Chemcatchem, 2016Co-Authors: Samira Siahrostami, Hanne Falsig, Poul Georg Moses, Felix Studt, Pablo Beato, Jens K NorskovAbstract:Copper exchange on all the different T sites of ZSM-22 and ZSM-5 is considered and the chemisorption energies of dioxygen, OH, and O species are studied. We show that for different T sites the adsorption energies vary significantly. The oxygen adsorption energy on copper-exchanged zeolites is quite similar to those of the most selective catalysts for oxidation reactions, that is, Ag and Au surfaces. The chemisorption energies of oxygen, carbon-, and nitrogen-containing species on different transition metals exchanged in ZSM-22 are also investigated. The study covers three different oxidation states, that is, 1+, 2+, and 3+ for the transition-metal exchanges. Scaling relations are presented for the corresponding species. Chemisorption of O scales with chemisorption of OH for all three considered exchanges, whereas there are essentially rough correlations for NH2 and N as well as CH3 and C.
Syed Ashfaq Nabi - One of the best experts on this subject based on the ideXlab platform.
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synthesis and characterization of a new organic inorganic pb2 selective composite cation Exchanger acrylonitrile stannic iv tungstate and its analytical applications
Chemical Engineering Journal, 2009Co-Authors: Syed Ashfaq Nabi, Mu Naushad, Rani BushraAbstract:A new polymeric–inorganic cation Exchanger acrylonitrile stannic(IV) tungstate composite was synthesized by sol–gel technique by incorporating stannic(IV) tungstate precipitate with acrylonitrile. Composite materials formed by the combination of inorganic ion Exchangers of multivalent metal acid salts and organic polymers (acrylonitrile, cellulose acetate, polyaniline, polypyrrole, polythiophene, etc.), providing a new class of ‘organic–inorganic’ composite Exchangers with better mechanical and granulometric properties, good ion exchange capacity, higher stability, reproducibility and selectivity for heavy metals. The physico-chemical characterization was carried out by elemental analysis, TGA, SEM, XRD, FTIR and TEM studies. Ion exchange capacity, pH titrations, elution and distribution behavior were also carried out to understand the ion exchange behavior of the material. The adsorption behavior of heavy metal ions has been reported in nitric acid and two surfactants media by batch processes. The analytical applications of the material have been explored by achieving some analytically important binary separations from aqueous solution on its columns. The practical applicability of acrylonitrile stannic(IV) tungstate was demonstrated in the quantitative separation of Fe3+and Zn2+ contents of a commercially available pharmaceutical sample namely Fefol-Z.
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synthesis characterization and analytical applications of a new composite cation Exchanger cellulose acetate zr iv molybdophosphate
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2008Co-Authors: Syed Ashfaq Nabi, Mu NaushadAbstract:Abstract A new composite cation Exchanger cellulose acetate-Zr(IV) molybdophosphate was synthesized because composite materials formed by the combination of inorganic ion Exchangers of multivalent metal acid salts and organic polymers (cellulose acetate, polyaniline, polythiophene, polypyrrole, Nylon 6,6, etc.), providing a new class of ‘organic–inorganic’ composite ion Exchangers with better mechanical and granulometric properties, good ion exchange capacity, reproducibility, higher stability and selectivity for heavy metals. The physico-chemical properties of this material were determined using some instrumental analyses viz. FTIR, X-ray, TGA–DTA and SEM. Ion exchange capacity, pH titrations, elution and distribution behavior were also carried out to understand the ion exchange behavior of the material. Its selectivity was examined by achieving some important binary separations like Mg(II)–Ca(II), Zn(II)–Ca(III), Fe(III)–Cr(III), Zn(II)–Cr(III), Cd(II)–Hg(II), Cd(II)–Cr(III) on its column. This new Exchanger was offered a variety of technological opportunity for quantitative determination and separation of Cr 3+ from a synthetic mixture of metal ions and Ca 2+ from commercially available vitamin and minerals formulation namely Recovit.
V. S. Soldatov - One of the best experts on this subject based on the ideXlab platform.
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potentiometric titration of ion Exchangers
Reactive & Functional Polymers, 1998Co-Authors: V. S. SoldatovAbstract:Theoretical works on potentiometric titration of ion Exchangers are reviewed. Most attention is paid to the approach considering this process as a specific case of ion exchange between H+ or OH− and the counterions of the titrant, Mz+ or Az−, accompanied by the neutralization reaction. An equation connecting the most important properties of the ion Exchanger–solution system (pH, concentration of the electrolyte in the solution phase and degree of neutralization of the ion Exchanger) named `acidity function' is discussed in detail. Practical methods for determination and use of a set of its three constants, sufficient for calculation of ionic equilibria in ion-exchange systems (parameters of acidic–basic strength of ion Exchangers), are described and illustrated with experimental examples. The acidity function is used for computer simulation of potentiomertic titration curves of ion Exchangers to observe the influence of different factors on position and shape of the potentiometric titration curves and chose the best possible conditions for observing the inflection points. The physical meaning of the constants of the modified Henderson–Hasselbach equation are discussed and their relations with the parameters of acidic–basic strength of ion Exchangers are expressed in the quantitative form.
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quantitative presentation of potentiometric titration curves of ion Exchangers
Industrial & Engineering Chemistry Research, 1995Co-Authors: V. S. SoldatovAbstract:Neutralization of ion Exchangers in H + or OH - forms by alkali M(OH) z or acid H z A was considered as a specific case of ion exchange H + -M z+ or OH - -A z- accompanied by the neutralization reaction. An equation connecting pH and the external electrolyte concentration with the ion Exchanger neutralization degree was derived. It can be used for presentation of the potentiometric titration curves in mathematical form or their calculation at different (not necessarily constant) concentrations of external electrolyte. Applicability of the modified Henderson-Hasselbach equation as one of the possible means for description of potentiometric titration curves of ion Exchangers was also discussed. The range of its applicability and limitations were established. The physical meaning of its constants was clarified, and the equations of their relations with the apparent ion exchange equilibrium constant have been obtained. The theoretical considerations are illustrated with the example of potentiometric titration curves of a carboxylic acid ion Exchanger obtained in a wide range of degrees of neutralization and external electrolyte concentrations.
Morikazu Hosoe - One of the best experts on this subject based on the ideXlab platform.
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characterization of semicrystalline titanium iv phosphates and their selectivity of cations and lithium isotopes
Journal of Materials Chemistry, 2002Co-Authors: Hiroaki Takahashi, Takao Oi, Morikazu HosoeAbstract:A semicrystalline layered titanium phosphate (scTiOP), which showed the chemical properties of a cation Exchanger, was synthesized from a mixed solution of titanyl sulfate and ammonium dihydrogenphosphate solutions under mild conditions. Based on the results of 31P MAS NMR measurements, infrared measurements, thermogravimetry–differential thermal analysis, ICP atomic emission spectroscopic analysis and powder X-ray diffraction analysis, the ion Exchanger was identified as Ti2O3(H2PO4)2·2H2O. Ion Exchangers with varying degrees of condensation of the dihydrogenphosphate groups, and consequently having three-dimensional cross-linked structures with minutely controlled ion exchange sites, were obtained by the thermal treatment of scTiOP at different temperatures. The ion Exchangers obtained by thermal treatment at temperatures from 200 to 600 °C showed a high affinity toward sodium ion among the alkali metal ions, whereas scTiOP and the ion Exchanger treated at 100 °C showed no specific selectivity of any alkali metal ion. The single-stage separation factor, S, for the lithium isotopes was a slow increasing function of the temperature of the thermal treatment up to 600 °C, and the maximum S value at 25 °C was 1.028. The occurrence of a high affinity to sodium ion, the increase in S value and the development of a three dimensional –O–P–O– network seemed mutually correlated.
