Study of the oxidation of solutions of p-chlorophenol and p-nitrophenol on Bi-doped PbO2 electrodes by UV-Vis and FTIR in situ spectroscopy

被引：77

作者：

Borrás, C ^{[1
]}

Laredo, T ^{[1
]}

Mostany, J ^{[1
]}

Scharifker, BR ^{[1
]}

机构：

[1] Univ Simon Bolivar, Dept Quim, Caracas 1080A, Venezuela

来源：

ELECTROCHIMICA ACTA | 2004年 / 49卷 / 04期

关键词：

p-chlorophenol; p-nitrophenol; electrocatalysis; oxidation of organics; metal oxide anode;

D O I：

10.1016/j.electacta.2003.09.019

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The oxidation of p-chlorophenol (pcp) and p-nitrophenol (pnp) was studied at Bi-doped PbO2 (Bi-PbO2) electrodes. The mass balance between solution composition and flowing charge was obtained from deconvolution of UV-Vis spectra recorded during electrolysis at constant potential. It is shown that the time-dependent production Of CO2 is different for the oxidation of pcp and pup, indicating different reaction mechanisms for the oxidation of each of these compounds. The reaction kinetics was also followed under thin layer conditions by SNIFTIRS; the similarly increasing signals associated to the generation Of CO2 obtained during oxidation of both compounds indicates that under conditions of restricted mass transfer the mineralization rates of pcp and pnp are similar. The results show that benzoquinone (bq) formed from oxidation of phenols desorbs prior to further oxidation to yield maleic acid (ma), in turn oxidizing further to CO2. (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：641 / 648

页数：8

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