DOI: 10.1016/j.watres.2017.11.030
Scopus记录号: 2-s2.0-85034429822
论文题名: Mechanism and efficiency of contaminant reduction by hydrated electron in the sulfite/iodide/UV process
作者: Yu K. ; Li X. ; Chen L. ; Fang J. ; Chen H. ; Li Q. ; Chi N. ; Ma J.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 129 起始页码: 357
结束页码: 364
语种: 英语
英文关键词: Advanced reduction processes
; Efficiency
; Hydrated electron
; Mechanism
; Sulfite/iodide/UV process
Scopus关键词: Contamination
; Dechlorination
; Efficiency
; Hydration
; Impurities
; Mechanisms
; Surface waters
; Hydrated electron
; Monochloroacetic acid
; Reduction efficiency
; Reduction process
; Reductive dechlorination
; Synergistic effect
; Toxic contaminants
; Transformation kinetics
; Sulfite process
; chloroacetic acid
; iodide
; sulfite
; surface water
; acetic acid
; iodide
; sulfite
; acetic acid
; dechlorination
; efficiency measurement
; electron
; hydration
; iodide
; pollutant
; probe
; reaction kinetics
; reduction
; sulfite
; transformation
; ultraviolet radiation
; Article
; chemical structure
; concentration at steady-state
; dechlorination
; electron
; hydration
; kinetics
; pH
; photolysis
; priority journal
; quantum yield
; reduction (chemistry)
; ultraviolet radiation
; water quality
; chemistry
; electron
; halogenation
; oxidation reduction reaction
; ultraviolet radiation
; water pollutant
; Acetates
; Electrons
; Halogenation
; Iodides
; Kinetics
; Oxidation-Reduction
; Sulfites
; Ultraviolet Rays
; Water Pollutants, Chemical
英文摘要: Advanced reduction by the extremely strong reducing species, hydrated electron (eaq −), is a promising and viable approach to eliminate a wide variety of persistent and toxic contaminants. In this study, we proposed a sulfite/iodide/UV process, which offered efficient production of eaq − for contaminant reduction. Using monochloroacetic acid (MCAA) as a simple eaq − probe, the availability of eaq − was assessed, and the mechanism involving the roles of S(IV) and iodide in the process was elucidated. A pronounced synergistic effect of S(IV) and iodide was observed in MCAA reductive dechlorination. The efficiency was much more dependent on the iodide concentration due to its higher absorptivity and quantum yield of eaq −. S(IV) played a dual role by producing eaq − via photoionization of SO3 2− and by reducing the reactive iodine species formed to avoid their scavenging of eaq −. When S(IV) was available, cycling of iodide occurred, favoring the constant eaq − production. The formation and transformation kinetics of sulfite radical were studied to verify the roles of S(IV) and iodide in the process. A kinetic model of MCAA dechlorination was also developed to quantify the eaq −-initiated reduction efficiency, highlighting the effects of S(IV), iodide, and pH. High pH favored the reduction, and the process was still effective in field surface water. This study underscores the importance of producing eaq − efficiently and of minimizing the eaq − scavenging of intermediates inherently formed and accumulated, and highlights the potential of the sulfite/iodide/UV process to efficiently eliminate recalcitrant contaminants. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113100
Appears in Collections: 气候减缓与适应
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作者单位: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China; College of Biology and the Environment, Nanjing Forestry University, Nanjing, 210037, China; School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China
Recommended Citation:
Yu K.,Li X.,Chen L.,et al. Mechanism and efficiency of contaminant reduction by hydrated electron in the sulfite/iodide/UV process[J]. Water Research,2018-01-01,129