UV/ferrate(VI) oxidation of profenofos: efficiency and mechanism

作者：Chen, Yiqun; Xiong, Ya; Wang, Zongping^*; Chen, Yong; Chen, Guomeng; Liu, Zizheng

来源：Desalination and Water Treatment, 2015, 55(2): 506-513.

DOI：10.1080/19443994.2014.917987

• Products
• Synergistic effect
• UV/ferrate(VI)
• Profenofos

The elimination of organophosphorus pesticide profenofos was investigated in the UV/ferrate(VI) solution. The oxidation of profenofos was pH dependent and increased in the order of pH 6.0 < 7.0 < 8.0 < 10.0 < 9.0. The degradation of profenofos increased with increasing ferrate(VI) dosage and decreased profenofos concentration. The UV254 was first found to exhibit a synergistic effect on the oxidation of profenofos by ferrate(VI). Up to 19.1% enhancement was observed with the introduction of ultraviolet light to the ferrate solution. The removal rate of profenofos increased via two-step addition of ferrate(VI) to the reaction solutions. By ESI-MS and MS/MS analysis, the main degradation product of profenofos in UV/ferrate(VI) solution was identified. The oxidation of profenofos proceeded via de-ethylation and de-propylation, leading to O-4-bromo-2-chlorophenyl O,S-dihydrogen phosphorothioate. The subsequent cleavage of C-O bond gave rise to the release of orthophosphate and possible generation of 4-bromo-2-chlorophenol. The results suggest that UV/ferrate(VI) is a good alternative for the treatment of organophosphorus pesticides in aqueous solution.

• 出版日期2015-7-10
• 单位华中科技大学