Removal of thiocyanate ions from aqueous solutions using polypyrrole and polyaniline conducting electroactive polymers

Authors

Chemistry Department, University of Guilan, P.O. Box 41335-1914, Rasht, Iran

Abstract

Polypyrrole (PPy/Cl) and polyaniline (PAni/Cl) synthesized chemically onto sawdust (SD)
was used for removal of thiocyanate (SCN-) ions from aqueous solutions. The effect of some
important parameters such as pH, initial concentration, sorbent dosage, and contact time on
uptake of SCN- was investigated. PPy/SD was found to be much more effective sorbent than
PAni/SD for uptake SCN- from aqueous solutions. Removal of SCN- ions using PPy/Cl is
supposed to be occurred mostly via ion exchange process at the surface of polymer coated onto
sawdust as a very thin film. Desorption studies were also carried out for figuring out the
possibility of the regeneration and reuse of the exhausted adsorbent. A proposed mechanism
based on interesting anion exchange properties of the PPy/Cl has been discussed. It was found
that polypyrrole conducting polymers doped with releasable counterions can be used for used to
remove some anions via ion exchange process under simple open circuit conditions. The finding
in this paper shows the promising application of polypyrrole conducting polymers in future water
or wastewater purification technology.

Keywords


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