Ag+/S2O82- SYSTEM FOR THE DEGRADATION OF AQUEOUS FLUTRIAFOL

作者：Yang, Hai^*; Zhou, Wenchang; Yang, Liping; Deng, Jiyong; Hu, Qian; Wei, Hongqing; Au, Chaktong; Yi, Bing

来源：Environment Protection Engineering, 2018, 44(2): 57-72.

DOI：10.5277/epe180204

• ACTIVATED PERSULFATE OXIDATION
• PHOTOCATALYTIC PROCESS
• SPECIES ROSS
• SULFATE RADICALS
• MECHANISM
• TRANSFORMATION
• HERBICIDES
• DIURON
• PHARMACEUTICALS
• PESTICIDES

The degradation of flutriafol in aqueous persulfate (S2O82-) system in the presence of selected transition metal ions was investigated. In the presence of Ag+ or Fe2+, flutriafol degradation occurs, whereas in the presence of Mn2+, Co2+, Ni2+, Cu2+, Zn2+ and Bi3+ ions, the degradation is less than 15%. The Ag+/S2O82- aqueous system being the most effective was adopted for experimental and theoretical investigations. It was confirmed that pH of 3.0 is the most suitable, and that both (SO4-)-S-center dot and (OH-)-O-center dot radicals are the main active species to afford flutriafol degradation, with the former contributes more than the latter. To elucidate degradation mechanism, molecular orbital calculations were performed and reaction intermediates identified by GC/MS and HPLC/MS/MS analyses. Three degradation pathways are proposed that involve the cleavage of C-N and C-C bonds as a result of (SO4-)-S-center dot attack, as well as the formation of hydroxylated products due to (OH)-O-center dot radicals.

• 出版日期2018
• 单位湖南工程学院