Mechanism and Pathways of Chlorfenapyr Photocatalytic Degradation in Aqueous Suspension of TiO2
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- 作者：Yongsong Cao ; Lei Yi ; Lu Huang ; Ying Hou ; and Yitong Lu
- 刊名：Environmental Science & Technology
- 出版年：2006
- 出版时间：May 15, 2006
- 年：2006
- 卷：40
- 期：10
- 页码：3373 - 3377
- 全文大小：116K
- 年卷期：v.40,no.10(May 15, 2006)
- ISSN：1520-5851
文摘
The light-induced degradation of chlorfenapyr under UVwas investigated in aqueous solutions containing TiO2 asphotocatalyst. The photocatalytic degradation of chlorfenapyrfollowed pseudo-first-order degradation kinetics (Ct =C0e-kt). The study focused on the identification of possibleintermediate products during the degradation, using gaschromatography mass-spectrometry (GC-MS) and 1HNMR.Six aromatic intermediates were identified by severaltechniques during the treatment and some of them werefurther confirmed by matching authentic standards. Structureanalysis of the degradation products suggested twodegradation pathways: (1) The aliphatic ether group wascleaved from chlorfenapyr to form pyrrole-alph-carboxylicacid, then the pyrrole group was broken to form 4-chloroglycine; (2) Chlorfenapyr was debrominated and the aliphaticether group was cleaved from the pyrrole group, whichwas further broken to form 4-chlorophenylglycine. The glycinewas degraded into 4-chlorobenzoic acids, which wasfurther broken into inorganic ions and CO2.