Photocatalytic degradation of 3,4-xylyl N-methylcarbamate (MPMC) and other carbamate pesticides in aqueous TiO2 suspensions
✍ Scribed by K Tanaka; S.M Robledo; T Hisanaga; R Ali; Z Ramli; W.A Bakar
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 161 KB
- Volume
- 144
- Category
- Article
- ISSN
- 1381-1169
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✦ Synopsis
Five carbamate pesticides were degraded photocatalytically on TiO . The comparison of their disappearance rates 2 showed that the degradation rate is governed predominantly by their adsorbability to TiO , and followed Hammett's law in a 2 Ž . 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.