ZHANG Xiao,CHENG Ting,CHEN Chen,et al.Debromination Efficiency of 2,4-Dibromophenol by UV/Sodium Sulfite Reduction System[J].China Water & Wastewater,2020,36(23 23):21-26.
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Debromination Efficiency of 2,4-Dibromophenol by UV/Sodium Sulfite Reduction System

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第36卷 Number: 23 23 Page: 21-26 Column: Date of publication: 2020-12-01
Author(s):
ZHANG Xiao1; 2; CHENG Ting1; CHEN Chen3; WANG Jin-nan2; 4; CHEN Gang3; YE Chen-hao3; DENG Qin3
(1. School of Environmental Ecology, Jiangsu Open University, Nanjing 210036, China; 2. Nanjing University & Yancheng Academy Environmental Protection Technology and Engineering, Yancheng 224005, China; 3. School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China; 4. State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210093, China)
Keywords:
halogenated organic compound; UV/SO2-3 system; 2; 4-dibromophenol; hydrated electron
Abstract:
The debromination efficiency of 2,4-dibromophenol (2,4-DBP) by UV/SO2-3 system at different conditions was investigated, and the debromination process, degradation mechanism and degradation pathway of the target pollutants were analyzed. The 2,4-DBP degradation efficiency of UV/SO2-3 reduction system was significantly higher than that of the individual UV system. Sodium sulfite concentration, pH value and reaction temperature had significant effects on the degradation of the target pollutants. With the increase of sodium sulfite concentration, initial pH value and reaction temperature, the 2,4-DBP degradation efficiency of the UV/SO2-3 system increased gradually. The quasi-first-order kinetic equation could better describe the degradation process of pollutants in the UV/SO2-3 system with different sodium sulfite concentrations and reaction temperatures. The hydrated electron capture agent could effectively inhibit the debromination reaction of 2,4-DBP. The 2,4-DBP debromination efficiency and bromide ion yield of the UV/SO2-3 system were higher than those of the individual UV system. Under the action of hydration electrons, the intermediate products of 2,4-DBP were 4-bromophenol, phenol and a small amount of 4,4’-biphenyldichol.
Last Update: 2020-12-01