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

Xiangying Liu, Lifeng Wang, Xiaomao Zhou, Kailin Liu, Lianyang Bai, Xuguo Zhou

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


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 2400 g a.i.ha−1, and the photodegradation efficiency of acephate reached 93.5% after 20 h at an acephate dosage of 675 g 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.

Original languageEnglish
Pages (from-to)331-337
Number of pages7
JournalJournal of Environmental Science and Health - Part B Pesticides, Food Contaminants, and Agricultural Wastes
Issue number5
StatePublished - May 4 2015

Bibliographical note

Funding Information:
This work was supported by a grant from the National Natural Science Foundation of China (21003042) and the Postgraduate Scientific Innovation Project of Hunan Provincial Education Department (CX2013B307).

Publisher Copyright:
© 2015, Copyright © Taylor & Francis Group, LLC.


  • Acephate
  • TiO/Ce
  • field trial
  • photocatalysis

ASJC Scopus subject areas

  • Food Science
  • Pollution


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