title: Kinetics and efficiency of the hydrated electron-induced dehalogenation by the sulfite/UV process.
abstract: Hydrated electron (e(aq)(-)), which is listed among the most reactive reducing species, has great potential for removal and detoxification of recalcitrant contaminants. Here we provided quantitative insight into the availability and conversion of e(aq)(-) in a newly developed sulfite/UV process. Using monochloroacetic acid as a simple e(aq)(-)-probe, the e(aq)(-)-induced dehalogenation kinetics in synthetic and surface water was well predicted by the developed models. The models interpreted the complex roles of pH and S(IV), and also revealed the positive effects of UV intensity and temperature quantitatively. Impacts of humic acid, ferrous ion, carbonate/bicarbonate, and surface water matrix were also examined. Despite the retardation of dehalogenation by electron scavengers, the process was effective even in surface water. Efficiency of the process was discussed, and the optimization approaches were proposed. This study is believed to better understand the e(aq)(-)-induced dehalogenation by the sulfite/UV process in a quantitative manner, which is very important for its potential application in water treatment.
authors: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
authors: Xuchun
authors: X
authors: Li
authors: School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
authors: Jingyun
authors: J
authors: Fang
authors: School of Civil Engineering, Harbin Engineering University, Harbin 150001, China.
authors: Guifang
authors: G
authors: Liu
authors: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
authors: Shujuan
authors: S
authors: Zhang
authors: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China. Electronic address: bcpan@nju.edu.cn.
authors: Bingcai
authors: B
authors: Pan
authors: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. Electronic address: majun@hit.edu.cn.
authors: Jun
authors: J
authors: Ma
mesh_terms: D000085:Acetates / Q000302:isolation & purification; D004583:Electrons; D054879:Halogenation; D006812:Humic Substances / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007700:Kinetics; D008962:Models, Theoretical; D009566:Nitrates / Q000302:isolation & purification; D013447:Sulfites / Q000737:chemistry*; D013696:Temperature; D014238:Trichloroacetic Acid / Q000302:isolation & purification; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification
chemical_list: D000085:Acetates; D006812:Humic Substances; D007477:Ions; D009566:Nitrates; D013447:Sulfites; D014874:Water Pollutants, Chemical; D014867:Water; C006972:chloroacetic acid; D014238:Trichloroacetic Acid
keywords: Efficiency; Hydrated electron; Kinetic modeling; Reductive dehalogenation; UV/sulfite