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Cation‐exchange kinetics and electrical conductivity studies of an ‘organic‐inorganic’ composite cation‐exchanger: Polypyrrole Th(IV) phosphate
Author(s) -
Khan Asif Ali
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.25183
Subject(s) - polypyrrole , ion exchange , composite number , activation energy , inorganic chemistry , materials science , conductive polymer , arrhenius equation , conductivity , chemistry , electrical resistivity and conductivity , analytical chemistry (journal) , ion , composite material , polymer , polymerization , organic chemistry , electrical engineering , engineering
Polypyrrole Th(IV) phosphate, an electrically conducting ‘organic‐inorganic’ cation‐exchange composite material was prepared by the incorporation of an electrically conducting polymer, i.e., polypyrrole, into the matrix of a fibrous type inorganic cation‐exchanger thorium(IV) phosphate. The composite cation‐exchanger has been of interest because of its good ion‐exchange capacity, higher chemical and thermal stability, and high selectivity for heavy metal ions. The temperature dependence of electrical conductivity of this composite system with increasing temperatures was measured on compressed pellets by using four‐in‐line‐probe dc electrical conductivity measuring instrument. The conductivity values lie in the semiconducting region, i.e., in the order of 10 −6 to 10 −4 S cm −1 that follow the Arrhenius equation. Nernst–Plank equation has been applied to determine some kinetic parameters such as self‐diffusion coefficient ( D 0 ), energy of activation ( E a ), and entropy of activation (Δ S* ) for Mg(II), Ca(II), Sr(II), Ba(II), Ni(II), Cu(II), Mn(II), and Zn(II) exchange with H + at different temperatures on this composite material. These results are useful for predicting the ion‐exchange process occurring on the surface of this cation‐exchanger. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007