DOI: 10.1016/j.watres.2018.03.004
Scopus记录号: 2-s2.0-85046009042
论文题名: Degradation of lipid regulators by the UV/chlorine process: Radical mechanisms, chlorine oxide radical (ClO•)-mediated transformation pathways and toxicity changes
作者: Kong X. ; Wu Z. ; Ren Z. ; Guo K. ; Hou S. ; Hua Z. ; Li X. ; Fang J.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 137 起始页码: 242
结束页码: 250
语种: 英语
英文关键词: Advanced oxidation process
; Chlorine oxide radical
; Lipid regulator
; Reactive chlorine species
; UV/chlorine
; Water treatment
Scopus关键词: Ammonia
; Biological materials
; Drug products
; Hydroxylation
; Oxidation
; Oxides
; Photodegradation
; Photolysis
; Rate constants
; Reaction intermediates
; Toxicity
; Water treatment
; Advanced Oxidation Processes
; Chlorine oxides
; Lipid regulators
; Reactive chlorine species
; UV/chlorine
; Chemicals removal (water treatment)
; ammonia
; benzene
; bezafibrate
; bromide
; bromide ion
; chloral hydrate
; chlorine
; chlorine oxide radical
; clofibric acid
; gemfibrozil
; hydroxyl radical
; natural organic matter
; nitrobenzene
; radical
; unclassified drug
; antilipemic agent
; bezafibrate
; chlorine derivative
; chlorosyl
; clofibric acid
; gemfibrozil
; chlorine
; degradation
; lipid
; oxidation
; photolysis
; radical
; reaction kinetics
; toxicity
; transformation
; ultraviolet radiation
; water treatment
; acute toxicity
; Aliivibrio fischeri
; Article
; chlorination
; controlled study
; cyclization
; degradation kinetics
; disinfection
; drug degradation
; drug transformation
; first order rate constant
; hydroxylation
; pH
; photolysis
; priority journal
; quantum yield
; reaction analysis
; reaction time
; ultra performance liquid chromatography
; ultraviolet radiation
; chemistry
; drug effect
; halogenation
; kinetics
; oxidation reduction reaction
; procedures
; radiation response
; sewage
; toxicity
; Vibrio
; water management
; water pollutant
; Vibrio fischeri
; Ammonia
; Bezafibrate
; Chlorine
; Chlorine Compounds
; Clofibric Acid
; Disinfection
; Gemfibrozil
; Halogenation
; Hydroxyl Radical
; Hypolipidemic Agents
; Kinetics
; Oxidation-Reduction
; Photolysis
; Ultraviolet Rays
; Vibrio
; Waste Disposal, Fluid
; Water Pollutants, Chemical
; Water Purification
英文摘要: Degradation of three lipid regulators, i.e., gemfibrozil, bezafibrate and clofibric acid, by a UV/chlorine treatment was systematically investigated. The chlorine oxide radical (ClO•) played an important role in the degradation of gemfibrozil and bezafibrate with second-order rate constants of 4.2 (±0.3) × 108 M−1 s−1 and 3.6 (±0.1) × 107 M−1 s−1, respectively, whereas UV photolysis and the hydroxyl radical (HO•) mainly contributed to the degradation of clofibric acid. The first-order rate constants (k′) for the degradation of gemfibrozil and bezafibrate increased linearly with increasing chlorine dosage, primarily due to the linear increase in the ClO• concentration. The k′ values for gemfibrozil, bezafibrate, and clofibric acid degradation decreased with increasing pH from 5.0 to 8.4; however, the contribution of the reactive chlorine species (RCS) increased. Degradation of gemfibrozil and bezafibrate was enhanced in the presence of Br−, whereas it was inhibited in the presence of natural organic matter (NOM). The presence of ammonia at a chlorine: ammonia molar ratio of 1:1 resulted in decreases in the k′ values for gemfibrozil and bezafibrate of 69.7% and 7%, respectively, but led to an increase in that for clofibric acid of 61.8%. Degradation of gemfibrozil by ClO• was initiated by hydroxylation and chlorine substitution on the benzene ring. Then, subsequent hydroxylation, bond cleavage and chlorination reactions led to the formation of more stable products. Three chlorinated intermediates were identified during ClO• oxidation process. Formation of the chlorinated disinfection by-products chloral hydrate and 1,1,1-trichloropropanone was enhanced relative to that of other by-products. The acute toxicity of gemfibrozil to Vibrio fischeri increased significantly when subjected to direct UV photolysis, whereas it decreased when oxidized by ClO•. This study is the first to report the transformation pathway of a micropollutant by ClO•. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112837
Appears in Collections: 气候减缓与适应
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作者单位: Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, China; School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China
Recommended Citation:
Kong X.,Wu Z.,Ren Z.,et al. Degradation of lipid regulators by the UV/chlorine process: Radical mechanisms, chlorine oxide radical (ClO•)-mediated transformation pathways and toxicity changes[J]. Water Research,2018-01-01,137