Synthesis and ion exchange behaviour of polyaniline Sn(IV) arsenophosphate: a polymeric inorganic ion exchanger

Incorporation of a polymer material into an inorganic ion exchanger provide s a class of hybrid ion exchangers with a good ion exchange capacity, high stability, reproducibility and selectivity for heavy metals. Such a type of ion exchanger 'polyaniline Sn(IV) arsenophosphate' has been synthesized by mixing polyaniline into inorganic material. This material is characterized using X-ray, IR, TGA studies in addition to ion exchange capacity, pH-titr ation, elution and distribution behaviour. On the basis of distribution stu dies, the material has been found to be highly selective for Pb(II). Kineti c study of exchange for the metal ions has been performed and some physical parameters such as self diffusion coefficient D-0, energy E-a and entropy Delta S* of activation have been determined. (C) 1999 Elsevier Science B.V. All rights reserved.