DOI: 10.1016/j.watres.2018.10.078
Scopus记录号: 2-s2.0-85056232911
论文题名: Enhanced degradation of organic contaminants by zero-valent iron/sulfite process under simulated sunlight irradiation
作者: Xie P. ; Zhang L. ; Chen J. ; Ding J. ; Wan Y. ; Wang S. ; Wang Z. ; Zhou A. ; Ma J.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 169
结束页码: 178
语种: 英语
英文关键词: Photo
; Propranolol
; Sulfate radical (SO 4 •− )
; Sulfite
; Zero-valent iron (ZVI)
Scopus关键词: Chlorine compounds
; Density functional theory
; Dissolved oxygen
; Impurities
; Irradiation
; Praseodymium compounds
; Sulfur compounds
; Photo
; Propranolol
; Sulfate radicals
; Sulfite
; Zerovalent irons
; Iron compounds
; amitriptyline
; bicarbonate
; bromate
; bromine
; chloride ion
; dissolved oxygen
; ferric ion
; ferrous ion
; humic acid
; imipramine
; iron
; methyl paraben
; natural organic matter
; nitrobenzene
; propranolol
; reducing agent
; sulfite
; bicarbonate
; chloride
; concentration (composition)
; decomposition
; degradation
; dissolved oxygen
; iron nanoparticle
; irradiation
; organic pollutant
; photochemistry
; radical
; simulation
; solar radiation
; sulfite
; Article
; comparative study
; controlled study
; decomposition
; degradation
; density functional theory
; hydroxylation
; irradiation
; observed association rate constant
; particle size
; pH
; photodegradation
; photon
; priority journal
; sunlight
; total organic carbon
; waste water management
英文摘要: Degradation of propranolol (PrP) by a combined zero-valent iron and sulfite system under simulated sunlight irradiation (ZVI/sulfite/photo) was investigated. Simulated sunlight irradiation enhanced the degradation of PrP by accelerating the decomposition of ferric sulfite complex as a result to producing sulfite radical (SO 3 •− ). As bubbles would block the transport of photons in the reaction solution, mechanical aeration rather than purging air was suggested to sustain the essential dissolved oxygen. The degradation of PrP increased with the elevation of initial ZVI concentration from 0.05 to 0.5 mM, but decreased a little with further increasing ZVI concentration to 1.0 mM. The degradation of PrP raised from 68.5% to 98.7% while sulfite dose increased from 0.1 to 2.0 mM. High removal efficiencies were always achieved when the initial PrP concentration ranged from 10 to 40 μM. As HSO 3 − which can efficiently complex Fe(II) and transfer Fe(III) to Fe(II) is the dominant species of sulfite at pH 4.0–6.0, the highest removal of PrP was achieved at pH 4.0–6.0. The presence of bicarbonate and humic acid significantly retarded the removal of PrP, while chloride ions could promote the removal of PrP to some extent. SO 4 •− , HO • and SO 5 •− were suggested to account for PrP removal, while SO 4 •− was evidenced to be the dominant radicals. Good reuse of ZVI in the system was also achieved as the removal of PrP kept higher than 80% after repeatedly used for 5 times. Possible degradation pathways of PrP in the ZVI/sulfite/photo system were accordingly proposed based on LC-MS and density functional theory calculation. The removal of amitriptyline, nitrobenzene, imipramine and methylparaben in the ZVI/sulfite/photo system was also evaluated. As a reducing agent, sulfite is expected to consume the possible formed bromine-containing intermediates as a result to inhibiting the formation of bromate, which is better than the activated persulfate system. © 2018 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122169
Appears in Collections: 气候变化事实与影响
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作者单位: School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China; Key Laboratory of Water and Wastewater Treatment (HUST), MOHURD, Wuhan, 430074, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China
Recommended Citation:
Xie P.,Zhang L.,Chen J.,et al. Enhanced degradation of organic contaminants by zero-valent iron/sulfite process under simulated sunlight irradiation[J]. Water Research,2019-01-01