DOI: 10.1016/j.watres.2018.01.038
Scopus记录号: 2-s2.0-85041401239
论文题名: Enhanced removal of Se(VI) from water via pre-corrosion of zero-valent iron using H2O2/HCl: Effect of solution chemistry and mechanism investigation
作者: Shan C. ; Chen J. ; Yang Z. ; Jia H. ; Guan X. ; Zhang W. ; Pan B.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 133 起始页码: 173
结束页码: 181
语种: 英语
英文关键词: Adsorption
; Corrosion
; Hydrogen peroxide
; Reduction
; Selenate
; ZVI
Scopus关键词: Adsorption
; Chemicals removal (water treatment)
; Chlorine compounds
; Corrosion
; Hydrogen peroxide
; Iron
; Iron compounds
; Iron oxides
; Reduction
; Silicates
; Sulfur compounds
; Suspensions (fluids)
; X ray absorption
; X ray absorption near edge structure spectroscopy
; Hydrated ferric oxides
; Inhibitory effect
; Mechanism investigation
; Selenate
; Solution chemistry
; Ssbauer spectroscopies
; X ray absorption near edge structure
; Zero-valent iron
; Selenium compounds
; calcium ion
; carbonic acid
; chloride
; ferric hydroxide
; ferrous ion
; hydrochloric acid
; hydrogen peroxide
; iron
; iron 57
; magnesium ion
; nitrate
; phosphate
; potassium ion
; selenium
; silicate
; sodium ion
; sulfate
; ferric ion
; hydrochloric acid
; hydrogen peroxide
; iron
; nitric acid derivative
; selenium
; adsorption
; aqueous solution
; buffering
; corrosion
; hydrogen peroxide
; iron nanoparticle
; performance assessment
; pollutant removal
; reduction
; selenate
; selenium
; water treatment
; aqueous solution
; Article
; corrosion
; electron transport
; Mossbauer spectroscopy
; priority journal
; reduction (chemistry)
; waste component removal
; adsorption
; chemistry
; corrosion
; procedures
; water management
; water pollutant
; Adsorption
; Carbonates
; Chlorides
; Corrosion
; Ferric Compounds
; Hydrochloric Acid
; Hydrogen Peroxide
; Iron
; Nitrates
; Phosphates
; Selenium
; Silicates
; Sulfates
; Water Pollutants, Chemical
; Water Purification
英文摘要: Although the removal of Se(VI) from water by using zero-valent iron (ZVI) is a promising method, passivation of ZVI severely inhibits its performance. To overcome such issue, we proposed an efficient technique to enhance Se(VI) removal via pre-corrosion of ZVI with H2O2/HCl in a short time (15 min). The resultant pcZVI suspension was weakly acidic (pH 4.56) and contained abundant aqueous Fe2+. 57Fe Mössbauer spectroscopy showed that pcZVI mainly consisted of Fe0 (66.2%), hydrated ferric oxide (26.3%), and Fe3O4 (7.5%). Efficient removal of Se(VI) from sulfate-rich solution was achieved by pcZVI compared with ZVI (in the absence and presence of H2O2) and acid-pretreated ZVI. Moreover, the efficient removal of Se(VI) by pcZVI sustained over a broad pH range (3–9) due to its strong buffering power. The presence of chloride, carbonate, nitrate, and common cations (Na+, K+, Ca2+, and Mg2+) posed negligible influence on the removal of Se(VI) by pcZVI, while the inhibitory effect induced by sulfate, silicate, and phosphate indicated the significance of Se(VI) adsorption as a prerequisite step for its removal. The consumption of aqueous Fe2+ was associated with Se(VI) removal, and X-ray absorption near edge structure revealed that the main pathway for Se(VI) removal by pcZVI was a stepwise reduction of Se(VI) to Se(IV) and then Se0 as the dominant final state (78.2%). Moreover, higher electron selectivity of pcZVI was attributed to the enhanced enrichment of Se oxyanions prior to their reduction. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112948
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China; State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Research Center for Environmental Nanotechnology (ReCENT), Nanjing University, Nanjing, 210023, China
Recommended Citation:
Shan C.,Chen J.,Yang Z.,et al. Enhanced removal of Se(VI) from water via pre-corrosion of zero-valent iron using H2O2/HCl: Effect of solution chemistry and mechanism investigation[J]. Water Research,2018-01-01,133