DOI: 10.1016/j.watres.2018.02.030
Scopus记录号: 2-s2.0-85042350404
论文题名: Dynamic interactions between sulfidated zerovalent iron and dissolved oxygen: Mechanistic insights for enhanced chromate removal
作者: Shao Q. ; Xu C. ; Wang Y. ; Huang S. ; Zhang B. ; Huang L. ; Fan D. ; Tratnyek P.G.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 135 起始页码: 322
结束页码: 330
语种: 英语
英文关键词: Aerobic
; Corrosion enhancement
; Fe(II) regeneration
; Reductive sequestration
; Sulfidation
; Zerovalent iron
Scopus关键词: Chromates
; Corrosion
; Dissolved oxygen
; Iron research
; Time series
; 1 ,10-phenanthroline
; Accelerated corrosion
; Aerobic
; Experimental conditions
; Metals and metalloids
; Reductive sequestration
; Sulfidation
; Zero-valent iron
; Iron compounds
; chromic acid
; dissolved oxygen
; iron nanoparticle
; 1,10-phenanthroline
; chromic acid
; chromium
; iron
; oxygen
; phenanthroline derivative
; sulfide
; water
; chemical reaction
; chromate
; corrosion
; dissolved oxygen
; experimental study
; iron
; iron nanoparticle
; literature review
; oxic conditions
; oxygenation
; pollutant removal
; analytic method
; Article
; chemical modification
; corrosion
; oxygenation
; priority journal
; reaction time
; sulfidation
; waste water management
; water contamination
; chemistry
; epidemiology
; isolation and purification
; water pollutant
; Chromates
; Chromium
; Interrupted Time Series Analysis
; Iron
; Oxygen
; Phenanthrolines
; Sulfides
; Water
; Water Pollutants, Chemical
英文摘要: Recent research on contaminant removal by zerovalent iron (ZVI) has evolved from investigating simple model systems to systems that encompass increased dimensions of complexity. Sulfidation and aerobic conditions are two of the most broadly relevant complications. Combining these two, this study investigated the dynamic interactions between sulfidated microscale ZVI and dissolved O2, for removal of Cr(VI), a model contaminant for metals and metalloids. The results show that the coupling of sulfidation and oxygenation significantly improves Cr removal, which is attributed to enhanced Fe(II) production that resulted from accelerated corrosion of Fe(0). The Cr(VI) removal rate increased with increasing O2 saturation from 0% to 100% but showed a bimodal dependence on the S/Fe ratio. At the optimal S/Fe ratio, the ZVI exhibits a highly porous surface morphology, which, according to prior literature on sulfur induced corrosion, promotes corrosion. In addition, a novel time series correlation was developed between aqueous Fe(II) and Cr(VI) based on data collected in the presence and absence of 1,10-phenanthroline, to probe for changes of reductants during the reaction time course. The analysis indicated that Fe(0) was responsible for the initial small amount of Cr(VI) removal, which then transitioned to a phase controlled by surface Fe(II). The slopes of the time series correlations during the latter phase of the reaction vary with experimental conditions but are mostly much higher than the theoretical stoichiometric ratio between Cr(VI) and Fe(II) (i.e., 0.33), indicating that Fe(II) regeneration contributes significantly to Cr removal. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112870
Appears in Collections: 气候减缓与适应
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作者单位: School of Environmental Science and Engineering, Shandong University, Jinan, Shandong 250100, China; Oak Ridge Institute for Science and Education Fellow, Office of Superfund Remediation and Technology Innovation, U.S. Environmental Protection Agency, Arlington, VA 22202, United States; OHSU-PSU School of Public Health, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, United States
Recommended Citation:
Shao Q.,Xu C.,Wang Y.,et al. Dynamic interactions between sulfidated zerovalent iron and dissolved oxygen: Mechanistic insights for enhanced chromate removal[J]. Water Research,2018-01-01,135