DOI: 10.1016/j.watres.2018.02.015
Scopus记录号: 2-s2.0-85042299799
论文题名: Transformations of dissolved organic matter induced by UV photolysis, Hydroxyl radicals, chlorine radicals, and sulfate radicals in aqueous-phase UV-Based advanced oxidation processes
作者: Varanasi L. ; Coscarelli E. ; Khaksari M. ; Mazzoleni L.R. ; Minakata D.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 135 起始页码: 22
结束页码: 30
语种: 英语
英文关键词: Active radical species
; Dissolved organic matter
; Ultrahigh resolution mass spectrometry
; UV/Free chlorine
; UV/H2O2
; UV/Persulfate
Scopus关键词: Biogeochemistry
; Contamination
; Dissolution
; Mass spectrometry
; Organic acids
; Photolysis
; Sulfur compounds
; Active radical species
; Dissolved organic matters
; Ultrahigh resolution mass spectrometries
; UV/H2O2
; UV/Persulfate
; Biological materials
; carboxylic acid
; chlorine
; dissolved organic matter
; fulvic acid
; hydrogen peroxide
; hydroxyl radical
; radical
; sulfate
; benzopyran derivative
; chlorine
; hydroxyl radical
; organic compound
; sulfate
; sulfate radical
; accelerator mass spectrometry
; aqueous solution
; chlorine
; concentration (composition)
; dissolved organic matter
; hydroxyl radical
; induced response
; oxidation
; photolysis
; pollutant removal
; sulfate
; transformation
; ultraviolet radiation
; Article
; chemical bond
; concentration at steady-state
; controlled study
; mass spectrometry
; oxidation
; photolysis
; priority journal
; ultraviolet radiation
; chemistry
; molecular weight
; oxidation reduction reaction
; photolysis
; procedures
; ultraviolet radiation
; waste water
; water management
; water pollutant
; Benzopyrans
; Chlorine
; Hydrogen Peroxide
; Hydroxyl Radical
; Mass Spectrometry
; Molecular Weight
; Organic Chemicals
; Oxidation-Reduction
; Photolysis
; Sulfates
; Ultraviolet Rays
; Waste Water
; Water Pollutants, Chemical
; Water Purification
英文摘要: Considering the increasing identification of trace organic contaminants in natural aquatic environments, the removal of trace organic contaminants from water or wastewater discharge is an urgent task. Ultraviolet (UV) and UV-based advanced oxidation processes (AOPs), such as UV/hydrogen peroxide (UV/H2O2), UV/free chlorine and UV/persulfate, are attractive and promising approaches for the removal of these contaminants due to the high reactivity of active radical species produced in these UV-AOPs with a wide variety of organic contaminants. However, the removal efficiency of trace contaminants is greatly affected by the presence of background dissolved organic matter (DOM). In this study, we use ultrahigh resolution mass spectrometry to evaluate the transformation of a standard Suwanee River fulvic acid DOM isolate in UV photolysis and UV-AOPs. The use of probe compounds allows for the determination of the steady-state concentrations of active radical species in each UV-AOP. The changes in the H/C and O/C elemental ratios, double bond equivalents, and the low-molecular-weight transformation product concentrations of organic acids reveal that different DOM transformation patterns are induced by each UV-AOP. By comparison with the known reactivities of each radical species with specific organic compounds, we mechanistically and systematically elucidate the molecular-level DOM transformation pathways induced by hydroxyl, chlorine, and sulfate radicals in UV-AOPs. We find that there is a distinct transformation in the aliphatic components of DOM due to HO• in UV/H2O2 and UV/free chlorine. Cl• induced transformation of olefinic species is also observed in the UV/free chlorine system. Transformation of aromatic and olefinic moieties by SO4 •- are the predominant pathways in the UV/persulfate system. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112892
Appears in Collections: 气候减缓与适应
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作者单位: Department of Civil and Environmental Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931-1295, United States; Chemical Advanced Resolution Methods Laboratory, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931-1295, United States; Department of Chemistry, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931-1295, United States
Recommended Citation:
Varanasi L.,Coscarelli E.,Khaksari M.,et al. Transformations of dissolved organic matter induced by UV photolysis, Hydroxyl radicals, chlorine radicals, and sulfate radicals in aqueous-phase UV-Based advanced oxidation processes[J]. Water Research,2018-01-01,135