Nanometer Titanium Dioxide Mediated High Efficiency Photodegradation of Fluazifop-p-Butyl

Guangling Li, Zhiguang Hou, Ruihong Zhang, Xiling Chen and Zhongbin Lu
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Guangling Li: School of Resources and Environmental Sciences, Jilin Agricultural University, Changchun 130118, China
Zhiguang Hou: School of Resources and Environmental Sciences, Jilin Agricultural University, Changchun 130118, China
Ruihong Zhang: School of Resources and Environmental Sciences, Jilin Agricultural University, Changchun 130118, China
Xiling Chen: School of Resources and Environmental Sciences, Henan Institute of Science and Technology, Xinxiang 453003, China
Zhongbin Lu: School of Resources and Environmental Sciences, Jilin Agricultural University, Changchun 130118, China

IJERPH, 2019, vol. 16, issue 19, 1-11

Abstract: The widespread use of fluazifop-p-butyl (FPB) contributes to its presence in the environment. Considering the ecological risks of FPB residues in the environment, the anatase nanometer titanium dioxide (nano-TiO 2 ) mediated photocatalytic degradation of FPB was studied by smearing FPB and nano-TiO 2 together on a glass plane; illumination, trimethylsilane derivatization of photolysis products, high performance liquid chromatography (HPLC) quantitative analysis and gas chromatograph-mass spectrometer (GC-MS) identification were used. Results showed that the first order dynamic model could describe the photodegradation of FPB by nano-TiO 2 mediated, and the photodegradation and photosensitization rates were found to be positively correlated with the dose of nano-TiO 2 at lower dose ranges. It is noticeable that a strong photosensitization effect was exhibited on degradation of FPB, not only under high-pressure mercury lamps, but also simulated sunlight (xenon lamp light). Ultimately, twelve main photolytic products were reasonably speculated, whilst five photolysis pathways were proposed. These results together suggest that nano-TiO 2 can be used as an effective photosensitizer to accelerate FPB photolysis.

Keywords: FPB; nano-TiO 2; photocatalytic degradation; derivatization; GC-MS (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
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