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Indexed by:期刊论文

Date of Publication:2012-12-01

Journal:INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE

Included Journals:SCIE、Scopus

Volume:7

Issue:12

Page Number:11847-11858

ISSN No.:1452-3981

Key Words:Polyaniline; Hexavalent chromium; Electrochemical reduction; Spectrographic pure graphite; Film electrode

Abstract:In this work, polyaniline (PANI) film was synthesized by the two-step electrochemical polymerization method from sulfonic acid solution on the spectrographic pure graphite (SPG) surface. Scanning electron microscope (SEM) characterization shows that the resulting PANI film had porous morphology and loosely textured structure, which is composed of uniform 1D nanowires with an average diameter of about 100-200 nm. The electroreduction of Cr(VI) to the much less toxic trivalent state (Cr(III)) was then studied on the PANI/SPG electrode. The effects of various parameters such as cathode potential, solution pH, PANI film thickness and electrolyte temperature on the Cr(VI) removal rate were investigated in detail. It was found that the negative cathod potential, low solution pH and appropriate PANI film thickness are benefit for the removal of Cr(VI). While the electrolyte temperature had no evident effect on the Cr(VI) electroreduction reaction. The electrochemical stability of the PANI film after use in Cr(VI) reduction process was also investigated using cyclic voltammetry and Fourier transfer infrared spectroscopy technologies.