Photocatalytic oxidation of the herbicide (4-chloro-2-methylphenoxy)acetic acid (MCPA) over TiO2

被引：80

作者：

Topalov, A ^{[1
]}

Abramovic, B ^{[1
]}

Molnár-Gábor, D ^{[1
]}

Csanádi, J ^{[1
]}

Arcson, O ^{[1
]}

机构：

[1] Univ Novi Sad, Fac Sci, Inst Chem, YU-21000 Novi Sad, Yugoslavia

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2001年 / 140卷 / 03期

关键词：

photocatalytic oxidation; herbicide MCPA; titanium(IV) oxide;

D O I：

10.1016/S1010-6030(01)00415-4

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The photocatalytic decomposition of the herbicide (4-chloro-2-methylphenoxy)acetic acid (MCPA), C9H9ClO3 in aqueous suspensions containing TiO2 was investigated by following the formation of intermediates via recording proton NMR spectra. One of theoretically possible intermediates, 4-chloro-2-methylphenolmethanoate, was synthesized by a modified esterification procedure. Based on the data obtained a possible reaction mechanism was proposed. The rate of MCPA aromatic ring decomposition was followed by pH changes during illumination. As a result, apparent reaction rate constant was found to be 7.0 x 10(-6) mol dm(-3) min(-1). The complete mineralization was attained after about 15 h of illumination. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：249 / 253

页数：5

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