Polyaniline modified tin cerium phosphate cation exchanger: an eco-friendly adsorbent for lead and bismuth metal ions

Vinisha Valsaraj P and Janardanan C

Department of Chemistry, Sree Narayana College, Kannur

Email: vinipunep@gmail.com

Abstract:

Tin cerium phosphate cation exchanger was synthesised by co-precipitation method. The exchanger modified with polyaniline by simple treatment of aniline with the exchanger. The composite material formed was characterised by TGA, XRD, and FT-IR, SEM. The structural studies revealed semi-crystalline nature of the material. The material showed high ion exchange capacity of 1.12 meqg^-1. The chemical resistivity of the material has been assessed in various acids, bases and organic solvents like 1.0 M HNO₃, 1.0 M H₂SO₄, Acetic acid, etc. The study of the effect of the temperature on ion exchange capacity of this material indicated the pronounced ion exchange capacity even at elevated temperature. Bifunctional behaviour of the material has been indicated by its pH titration curves. The distribution coefficient studies of metal ions on the material were performed in different solvent systems and the material was found to be selective for Pb(II),  and Bi(III) ions. On the basis of distribution coefficient value, some analytically important binary separations of metal ion like Pb(II)-Ni(II), Pb(II)-Mg(II), Pb(II)-Mn(II), Bi(III)-Ni(II), Bi(III)-Mg(II), Bi(III)-Mn(II) were achieved on exchanger column.

Keywords: Composite ion exchanger, Polyaniline, Adsorption, Distribution coefficient

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