Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (03): 424-428.doi: 10.3866/PKU.WHXB20070327

• Note • Previous Articles     Next Articles

Deactivation of Two Different Kinds of Anodes during the Degradation of Organics and Their Oxidative Mechanisms

TONG Shao-Ping;MA Chun-An;FEI Hui   

  1. (State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032, P. R. China)

  • Received:2006-07-20 Revised:2006-11-10 Published:2007-03-07
  • Contact: TONG Shao-Ping E-mail:sptong@zjut.edu.cn

PDF

4042

Like

Abstract:

Deactivations of two different kinds of anodes during electrochemical oxidation of p-chlorophenol (p-CP) were investigated by using electrochemical measurement, and their corresponding oxidation mechanisms were also discussed. The results indicated that p-CP could be oxidized directly on both the Pt (“I”type anode) and PTFE (polytetrafluoroethylene)-β-PbO2 (“II”type anode), however, the electro-catalytic activities of both anodes lost immediately. Electrolysis at high potential could recover the electro-catalytic activities of both anodes, and Pt needed higher potential than PTFE-β-PbO2 did. The deactivated Pt could also recover its activity by soaking it in ordinary organic solvents such as acetone, tetrahydrofuran, dimethyl sulfoxide, but deactivated PTFE-β-PbO2 could not. For Pt anode (“I”), besides the direct oxidation of p-CP, oxygen transfer reaction was the main cause for the removal of p-CP when anodic potential was higher than 2.0 V; for PTFE-β-PbO2 anode (“II”), besides the direct oxidation reaction, the oxidative reaction of hydroxyl radical became the main cause for the removal of p-CP when anodic potential was higher than 1.8 V.

Key words: Pt, PbO2, p-chlorophenol, Polymer film, Degradation, Deactivation