Synthesis, characterization, and analytical application of zirconium(IV) selenoiodate, a new cation exchanger

Zirconium(IV) selenoiodates have been synthesized under a variety of conditions. The most chemically and thermally stable sample is prepared by adding a mixture of aqueous solutions of 0.1 mol L−1 potassium iodate and 0.1 mol L−1 sodium selenite to aqueous solution of 0.1 mol L−1 zirconium(IV) oxychloride. Its ion-exchange capacity for K+ and Pb2+ was found to be 3.20 and 2.35 meq g−1 dry exchanger, respectively. The material has been characterized on the basis of chemical composition, pH titration, and thermogravimetric analysis. The effect on the exchange capacity of drying the exchanger at different temperatures has also been studied. The analytical importance of the material has been established by quantitative separation of Pb2+ from other metal ions.