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Photocatalytic degradation of dimethoate in Bok choy using cerium-doped nano titanium dioxide

文献类型： 外文期刊

作者： Liu, Xiangying 2 ; Li, Yu 1 ; Zhou, Xuguo 1 ; Luo, Kun 1 ; Hu, Lifeng 1 ; Liu, Kailin 1 ; Bai, Lianyang 1 ;

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

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

3.Collaborat Innovat Ctr Farmland Weeds Control, Loudi, Hunan, Peoples R China

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

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2018 年 13 卷 5 期

页码：

收录情况： SCI

摘要： Dimethoate, a systemic insecticide, has been used extensively in vegetable production. Insecticide residues in treated vegetables, however, pose a potential risk to consumers. Photocatalytic degradation is a new alternative to managing pesticide residues. In this study, the degradation of dimethoate in Bok choy was investigated under the field conditions using cerium-doped nano titanium dioxide (TiO2/Ce) hydrosol as a photocatalyst. The results show that TiO2/Ce hydrosol can accelerate the degradation of dimethoate in Bok choy. Specifically, the application of TiO2/Ce hydrosol significantly increased the reactive oxygen species (ROS) contents in the treated Bok choy, which speeds up the degradation of dimethoate. Ultra-performance liquid chromatography coupled with mass spectrometry (UPLC-MS) analysis detected three major degradation products, including omethoate, 0,0, S-trimethyl thiophosphorothioate, and 1,2-Bis (acetyl-N-methyl-) methane disulfide. Two potential photodegradation pathways have been proposed based on the intermediate products. To understand the relationship between photodegradation and the molecular structure of target insecticides, we investigated the bond length, Mulliken atomic charge and frontier electron density of dimethoate using ab initio quantum analysis. These results suggest the P = S, P-S and S-C of dimethoate are the initiation sites for the photocatalytic reaction in Bok choy, which is consistent with our empirical data.

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