Synthesis of a crystalline organic–inorganic composite exchanger, acrylamide stannic silicomolybdate: Binary and quantitative separation of metal ions

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. Cd2+–Pb2+, Cd2+–Cu2+, Al3+–Pb2+, Al3+–Cu2+, Zn2+–Pb2+, Zn2+–Cu2+ was achieved quantitatively on acrylamide stannic silicomolybdate columns. Pb2+ and Cu2+ were selectively removed from synthetic mixtures containing Cu2+, Mg2+, Cd2+, Hg2+, Zn2+ and Ba2 and Pb2+, Hg2+, Cd2+, Ba2+, Mg2+ and Ba2+ respectively. The quantitative separation of Cu2+ and Zn2+ were also achieved on commercially available pharmaceutical formulation I-Vit.