Electrochemical Oxidation Mechanism of Thiosalicylic Acid on Activated Glassy Carbon Electrode

doi:10.3724/SP.J.1095.2014.30210

Chinese Journal of Applied Chemistry

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Electrochemical Oxidation Mechanism of Thiosalicylic Acid on Activated Glassy Carbon Electrode

LIU Wenhan^*, YUAN Ronghui, TENG Yuanjie, MA Chunan

(College of Chemical Engineering and Material Science,Zhejiang University of
Technology,Hangzhou 310014,China)

Received:2013-04-27 Revised:2013-06-24 Published:2014-03-10 Online:2014-03-10
Supported by:
Supported by the Science and Technology Project of Zhejiang Province/Analysis Test Foundation(No.2012C37014), and Zhejiang Province Key Scientific and
Technological Innovation Team(No.2011R0900212)

Abstract

Abstract: Electrochemical behavior of thiosalicylic acid(TSA) on activated glassy carbon electrode(GCE) was studied. TSA exhibited irreversible electrochemical oxidation process in KCl solution by cyclic voltammetry(CV). Neutral/anionic TSA distribution and anodic potential shifts at different pH were also discussed. With increase of pH, the anodic potential gradually decreases while the concentration of C6H4(COO-)SH increases. This indicates that C6H4(COO-)SH is more readily to be oxidized than C6H4(COOH)SH. The decreasing tendency of potential slows down when the pH is above 6. When the pH is elevated to 11, the disappearance of anodic peak indicates that the electrode reaction is prohibited in the absences of H+. During the electrochemical oxidation of TSA, one H+ participates in the reaction with average every three electrons transferring. Therefore, the final product is inferred as 2-sulfobenzoic acid.

Key words: thiosalicylic acid, cyclic voltammetry, activated glassy carbon electrode, electrochemical oxidation mechanism

CLC Number:

O646

LIU Wenhan*, YUAN Ronghui, TENG Yuanjie, MA Chunan. Electrochemical Oxidation Mechanism of Thiosalicylic Acid on Activated Glassy Carbon Electrode[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.30210.

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Electrochemical Oxidation Mechanism of Thiosalicylic Acid on Activated Glassy Carbon Electrode

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