DOI: 10.1016/j.watres.2017.12.046
Scopus记录号: 2-s2.0-85044934873
论文题名: Hydroxyl radical dominated degradation of aquatic sulfamethoxazole by Fe0/bisulfite/O2: Kinetics, mechanisms, and pathways
作者: Du J. ; Guo W. ; Wang H. ; Yin R. ; Zheng H. ; Feng X. ; Che D. ; Ren N.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 138 起始页码: 323
结束页码: 332
语种: 英语
英文关键词: Bisulfite (S(IV))
; Chemical calculation
; Degradation pathways
; Fe0
; Sulfamethoxazole (SMX)
Scopus关键词: Chemical activation
; Degradation
; Density functional theory
; Electron spin resonance spectroscopy
; Kinetics
; Paramagnetic resonance
; 1 ,10-phenanthroline
; Bisulfite (S(IV))
; Chemical calculations
; Degradation pathways
; Electron paramagnetic resonances (EPR)
; Experimental methods
; Reactive oxidative species
; Sulfamethoxazole (SMX)
; Iron compounds
; 1,10 phenanthroline
; bisulfite
; ferric ion
; ferrous ion
; hydroxide
; hydroxyl radical
; iron
; oxygen
; reactive oxygen metabolite
; sulfamethoxazole
; sulfate
; unclassified drug
; zero valent iron
; antiinfective agent
; hydrogen sulfite
; hydroxyl radical
; iron
; oxygen
; sulfamethoxazole
; sulfite
; antibiotics
; biodegradation
; chemical reaction
; concentration (composition)
; experimental study
; hydroxykenoelsmoreite
; hydroxyl radical
; iron oxide
; pollutant removal
; reaction kinetics
; reactive oxygen species
; absorption
; adsorption
; aquatic environment
; Article
; concentration (parameters)
; corrosion
; degradation
; degradation kinetics
; density functional theory
; electron spin resonance
; iron kinetics
; oxidation
; priority journal
; reaction analysis
; chemistry
; kinetics
; oxidation reduction reaction
; procedures
; water management
; water pollutant
; Anti-Infective Agents
; Electron Spin Resonance Spectroscopy
; Hydroxyl Radical
; Iron
; Kinetics
; Oxidation-Reduction
; Oxygen
; Sulfamethoxazole
; Sulfites
; Water Pollutants, Chemical
; Water Purification
英文摘要: In this study, batch experiments were carried out to investigate the key factors on sulfamethoxazole (SMX) removal kinetics in a new AOPs based on the combination of zero valent iron (Fe0) and bisulfite (S(IV)). With the increase of Fe0 from 0.25 mM to 5 mM, the removal rate of SMX was linearly increased in the Fe0/S(IV)/O2 system by accelerating the activation of S(IV) and Fe0 corrosion to accelerate. In the first 10 min of reaction, the increasing concentration of S(IV) inhibited SMX removal after since the high S(IV) concentration quenched reactive oxidative species (ROS). Then SMX removal rate was accelerated with the increase of S(IV) concentration after S(IV) were consumed up. The optimal ratio of S(IV) concentrations to Fe0 concentration for SMX removal in the Fe0/S(IV)/O2 system was 1:1. With SMX concentrations increasing from 1 to 50 μM, SMX removal rate was inhibited for the limitation of ROS yields. Although the presence of [rad]SO4 − and [rad]OH was confirmed by electron paramagnetic resonance (EPR) spectrum, [rad]OH was identified as the dominant ROS in the Fe0/S(IV)/O2 system by chemical quenching experiments. Besides, strong inhibitive effects of 1,10-phenanthroline on SMX degradation kinetics by Fe0/S(IV)/O2 proved that the generation of ROS was rely on the release of Fe(II) and Fe(III). The generation of [rad]SO4 − was ascribed to the activation of S(IV) by Fe(II)/Fe(III) recycling and the activation of HSO5 − by Fe(II). And [rad]OH was simultaneously transformed from [rad]SO4 − and generated by Fe0/O2. Density functional theory (DFT) calculation was conducted to reveal special reactive sites on SMX for radicals attacking and predicted intermediates. Finally, four possible SMX degradation pathways were accordingly proposed in the Fe0/S(IV)/O2 system based on experimental methods and DFT calculation. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112802
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China
Recommended Citation:
Du J.,Guo W.,Wang H.,et al. Hydroxyl radical dominated degradation of aquatic sulfamethoxazole by Fe0/bisulfite/O2: Kinetics, mechanisms, and pathways[J]. Water Research,2018-01-01,138