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Ion exchange Characteristics of newly Synthesized Cerium Zirconium Phosphotungstate and its Analytical Applications

Author Affiliations

  • 1Department of Chemistry, University College, Thiruvananthapuram, Kerala, INDIA-695034
  • 2Department of Chemistry, Sree Narayana College, Thottada P.O., Kannur, Kerala, INDIA-670 007

Res.J.chem.sci., Volume 4, Issue (7), Pages 43-51, July,18 (2014)


Growing environmental problems have necessitated the selective determination and removal of heavy metal ions, for which inorganic ion exchangers are found to be suitable. Zirconium based ion exchangers have received attention because of their excellent ion exchange behaviour. A bimetallic heteropoly acid salt,cerium zirconium phosphotungstate (CZPT) was synthesized by precipitation method. Chemical composition was determined by EDS method and structural characterizations were done by Thermo gravimetric analysis, X-ray diffraction analysis and Fourier Transform Infrared Spectroscopic analysis etc. UV-Visible diffuse reflectance spectroscopic studies were carried out for characterization as well as to study the optical properties. Ion exchange properties were studied by determining ion exchange capacity and distribution coefficients for various metal ions. pH titration studies, effect of hydrated ionic radii and temperature on ion exchange capacities and stability in various media were also studied. The distribution studies revealed that the material is a good scavenger of metal ions such as bismuth, copper, strontium, lead, thorium etc. On the basis of the selectivity pattern, the separation potential of the ion exchanger was explored by carrying out binary separations of metal ions such as Ca2+, Hg2+, Mg2+, Zn2+, Co2+ and Ni2+ from Bi3+on a column of the ion exchanger by using suitable eluents. The eluents were selected after studying the electrolyte effect on distribution coefficients of metal ions. Difference in selectivity towards aluminium and magnesium was used for the analysis of these ions in antacids. The material was found to absorb all the light in the UV region and this knowledge can be utilized for photo stability of pigments by introducing this. In addition to this, it shows electronic and ionic conduction also. Thus the material find promising applications in various fields by combining its ion exchange properties, catalytic activity, electron exchange properties, optical properties, electrical properties, semiconducting properties etc.


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