Photocatalytic degradation of 3,4-xylyl N-methylcarbamate (MPMC) and other carbamate pesticides in aqueous TiO2 suspensions

被引:37
作者
Tanaka, K
Robledo, SM
Hisanaga, T
Ali, R
Ramli, Z
Bakar, WA
机构
[1] Natl Inst Mat & Chem Res, Tsukuba, Ibaraki 3058565, Japan
[2] Natl Ctr Metrol, Queretaro, Mexico
[3] Univ Teknoliji Malaysia, Dept Chem, Johor Baharu 80990, Johor, Malaysia
关键词
carbamate; photocatalytic degradation; pesticide;
D O I
10.1016/S1381-1169(99)00112-0
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
Five carbamate pesticides were degraded photocatalytically on TiO2. The comparison of their disappearance rates showed that the degradation rate is governed predominantly by their adsorbability to TiO2, and followed Hammett's law in a different manner from ordinary electrophilic reaction, As a degradation pathway of 3,4-xylyl N-methylcarbamate (MPMC) successive hydroxylation of aromatic ring was suggested, and polyhydroxylation is considered to lead to the opening of the aromatic ring to form oxygenated aliphatic intermediates. It was indicated in this process that the formation of acetic acid, one of the major aliphatic intermediates, mainly originates from methyl substituents on the aromatic ring. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:425 / 430
页数:6
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