Synthesis Of Selenite And Tellurite Pased Cation Exchangers And Their Selected Applications

The synthesis of zirconium selenite and thorium telluriternare reported. Zirconium selenite has been prepared byrnmixing 4 N HCl solution of zirconium oxychloride withrn4 N HCl solution of sodium selenite, and by adjusting thernacidity of the solution to about 1 M HC1. Thorium telluriternhas been prepared by mixing 1 M HN03 solution of thoriumrnnitrate with 4 N HCl solution of sodium tellurite. and byrnadjusting the acidity of the solution to about 1 M HC1.rnThe chemical composition for both exchangers showed metalrnto anion Zr:Se and Th:Te ratio of 1:2. The IR spectrum ofrnboth exchangers revealed absorption bands in the regionrn3500-3000 cm- 1 due to water molecules and OH groups, andrn1700-1600 cm -1 • which may be due to interestitial water.rnThe hydrogen ion liberation capacity of zirconium seleniternand thorium tellurite was found to be 1.2 meq/g and 1.12 meq/grnrespectively. Distribution coefficients of metal ions onrnboth exchangers were determined at different pH in the rangern2-6.5. The distribution coefficients were higher for Pb.rnCo and Cu than for other metal ions. On the basis ofrndistribution coefficients, separations of Pb2+ from Cu2+,rn2+ 2+ 2+ 2+ 2+rnCd • Zn • Co • Mn • and Ni have been achieved onrnboth exchangers. A number of binary and ternary separationernof metal ions have been achieved on the columns of bothrnexchangers.

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