Journal
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
Volume 50, Issue 5, Pages 331-337Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/03601234.2015.1000177
Keywords
photocatalysis; Acephate; field trial; TiO2/Ce
Funding
- National Natural Science Foundation of China [21003042]
- Postgraduate Scientific Innovation Project of Hunan Provincial Education Department [CX2013B307]
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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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