Journal of Zhejiang University SCIENCE A
ISSN 1673-565X(Print), 1862-1775(Online), Monthly

2007   Vol. 8   No. 9   p. 1457~1461

Anodic oxidation of salicylic acid at Ta/BDD electrode

ZHANG Juan¹, CHEN Xue-ming^†‡1, YAO Pei-dong¹, CHEN Guo-hua²

(¹Environmental Engineering Department, Zhejiang University, Hangzhou 310027, China)
(²Chemical Engineering Department, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China)
^‡ Corresponding Author
^†E-mail: chenxm@zju.edu.cn
Received May 23, 2007 revision accepted June 15, 2007

Abstract: Boron-doped diamond (BDD) film electrodes using Ta as substrates were employed for anodic oxidation of salicylic acid (SA). The effects of operational variables including initial concentration, current density, temperature and pH were examined. The results showed that BDD films deposited on the Ta substrates had high electrocatalytic activity for SA degradation. There was little effect of pH on SA degradation. The current efficiency (CE) was found to be dependent mainly on the initial SA concentration, current density and temperature. Chemical oxygen demand (COD) was reduced from 830 mg/L to 42 mg/L under a current density of 200 A/m² at 30 °C.

Key words: Salicylic acid (SA), Anodic oxidation, Ta/BDD, Current efficiency (CE), Electrocatalytic activity
doi:10.1631/jzus.2007.A1457             CLC number: X5

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