Synthesis and characterization of antimony(III) selenite and antimony(III) tungstate as inorganic ion exchangers

Abstract

Two stable inorganic ion exchangers, antimony(III) selenite and antimony(III) tungstate, have been synthesised and characterised and the effects of size and charge of the exchanging

ion on the exchange capacity have been studied and the K_d values for 11 metal ions in demineralised water have been determined. The effect of temperature on ion exchange capacity and of electrolyte concentration on distribution coefficients for some metal ions have been studied. The uptake sequence shown by antimony( III) selenite is Th⁴⁺>Hg²⁺>Pb²⁺>Mg²⁺>Ca²⁺>Cu²⁺>Zn²⁺>Ni²⁺>Co²⁺ and that by antimony(III) tungstate is

Cd²⁺>Pb²⁺>Hg²⁺>B²⁺>Th⁴⁺>Cu²⁺>Ni²⁺>Zn²⁺>Mg²⁺. Successful separation of Hg²⁺ from Zn²⁺, Pb²⁺, Cd²⁺, Ca²⁺, Cu²⁺ and Ni²⁺ on antimony(III) selenite and separation of Zn²⁺-Pb²⁺, Mg²⁺-Pb²⁺, Cu²⁺ -Pb²⁺, Zn²⁺ -Hg²⁺ and Cd²⁺-Hg²⁺ on antimony( III) tungstate have also been carried out.