Synthesis of Selenite and Tellurite Pased Cation Exchangers and their Selected Applications
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Date
1980-06
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Addis Ababa Universty
Abstract
The synthesis of zirconium selenite and thorium tellurite
are reported. Zirconium selenite has been prepared by
mixing 4 N HCl solution of zirconium oxychloride with
4 N HCl solution of sodium selenite, and by adjusting the
acidity of the solution to about 1 M HC1. Thorium tellurite
has been prepared by mixing 1 M HN03 solution of thorium
nitrate with 4 N HCl solution of sodium tellurite. and by
adjusting the acidity of the solution to about 1 M HC1.
The chemical composition for both exchangers showed metal
to anion Zr:Se and Th:Te ratio of 1:2. The IR spectrum of
both exchangers revealed absorption bands in the region
3500-3000 cm- 1 due to water molecules and OH groups, and
1700-1600 cm -1 • which may be due to interestitial water.
The hydrogen ion liberation capacity of zirconium selenite
and thorium tellurite was found to be 1.2 meq/g and 1.12 meq/g
respectively. Distribution coefficients of metal ions on
both exchangers were determined at different pH in the range
2-6.5. The distribution coefficients were higher for Pb.
Co and Cu than for other metal ions. On the basis of
distribution coefficients, separations of Pb2+ from Cu2+,
2+ 2+ 2+ 2+ 2+
Cd • Zn • Co • Mn • and Ni have been achieved on
both exchangers. A number of binary and ternary separatione
of metal ions have been achieved on the columns of both
exchangers.
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Keywords
Selenite and Tellurite