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Photocatalytic degradation of acephate in pak choi, Brassica chinensis, with Ce-doped TiO2

文献类型： 外文期刊

作者： Liu, Xiangying 1 ; Wang, Lifeng 1 ; Zhou, Xiaomao 1 ; Liu, Kailin 1 ; Bai, Lianyang 1 ; Zhou, Xuguo 3 ;

作者机构： 1.Hunan Agr Univ, Coll Plant Protect, Changsha, Hunan, Peoples R China

2.Hunan Acad Agr Sci, Biotechnol Res Ctr, Changsha, Hunan, Peoples R China

3.Univ Kentucky, Dept Entomol, Lexington, KY 40546 USA

关键词： photocatalysis;Acephate;field trial;TiO2/Ce

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES （ 影响因子：1.99； 五年影响因子：2.116 ）

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收录情况： SCI

摘要： The photocatalytic degradation of acephate was investigated using Ce-doped TiO2 (TiO2/Ce) hydrosol. In contrast to previous research conducted under artificial light in the laboratory, this study investigated the decomposition of acephate in a field trial. The results show that acephate can be efficiently degraded by the TiO2/Ce system under natural field conditions; the degradation efficiency was affected by the dosage of the photocatalyst and acephate. The optimum dosage of TiO2/Ce was 2400g a.i.ha(-1), and the photodegradation efficiency of acephate reached 93.5% after 20h at an acephate dosage of 675g a.i.ha(-1). Ultra-performance liquid chromatography/mass spectrometry (UPLC/MS) analysis detected and identified four degradation products-methamidophos, phosphorothioic acid O,O,S-trimethyl ester, S-methyl methanethiosulfonate and phosphorous acid-that were formed during the TiO2/Ce photodegradation of acephate. Based on the structural identification of the degradation products, a probable photodegradation pathway was proposed, and the first decomposition step may be the cleavage of the C-N bond of acephate. Subsequently, the P-S and P-O bonds may be oxidized gradually or simultaneously to complete the mineralization.

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