DOI: 10.1016/j.watres.2018.02.017
Scopus记录号: 2-s2.0-85041712230
论文题名: Factors influencing degradation of trichloroethylene by sulfide-modified nanoscale zero-valent iron in aqueous solution
作者: Dong H. ; Zhang C. ; Deng J. ; Jiang Z. ; Zhang L. ; Cheng Y. ; Hou K. ; Tang L. ; Zeng G.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 135 起始页码: 1
结束页码: 10
语种: 英语
英文关键词: Dechlorination
; Ferrous sulfide
; Nanoscale zero-valent iron
; Sulfidation
; TCE
Scopus关键词: Alkalinity
; Anesthetics
; Dechlorination
; Dissolved oxygen
; Efficiency
; Groundwater
; Iron
; Nanotechnology
; Passivation
; Solutions
; Spectroscopic analysis
; Sulfur compounds
; Trichloroethylene
; Alkaline conditions
; Critical factors
; Ferrous sulfide
; Nano-scale zero valent irons
; Sulfidation
; Sulfidation treatment
; Surface passivation
; Tce dechlorination
; Iron compounds
; chloride ion
; dissolved oxygen
; iron nanoparticle
; sulfur derivative
; trichloroethylene
; ground water
; iron
; sodium dithionate
; sulfate
; sulfide
; trichloroethylene
; aging
; alkalinity
; aqueous solution
; dechlorination
; degradation
; dissolved oxygen
; iron nanoparticle
; oxidation
; reactivation
; sulfide
; trichloroethylene
; aqueous solution
; Article
; chemical composition
; dechlorination
; degradation
; electric conductivity
; electron transport
; oxidation
; oxidation reduction potential
; particle size
; pH
; physical chemistry
; priority journal
; surface property
; waste component removal
; chemistry
; halogenation
; infrared spectroscopy
; procedures
; solution and solubility
; transmission electron microscopy
; water management
; water pollutant
; X ray diffraction
; X ray photoemission spectroscopy
; Groundwater
; Halogenation
; Hydrogen-Ion Concentration
; Iron
; Microscopy, Electron, Transmission
; Photoelectron Spectroscopy
; Solutions
; Spectroscopy, Fourier Transform Infrared
; Sulfates
; Sulfides
; Trichloroethylene
; Water Pollutants, Chemical
; Water Purification
; X-Ray Diffraction
英文摘要: Sulfide-modified nanoscale zero-valent iron (S/NZVI) has been considered as an efficient material to degrade trichloroethylene (TCE) in groundwater. However, some critical factors influencing the dechlorination of TCE by S/NZVI have not been investigated clearly. In this study, the effects of Fe/S molar ratio, initial pH, dissolved oxygen and particle aging on TCE dechlorination by S/NZVI (using dithionite as sulfidation reagent) were studied. Besides, the feasibility of reactivation of the aged-NZVI by sulfidation treatment was looked into. The results show that the Fe/S molar ratio and initial pH significantly influenced the TCE dechlorination, and a higher TCE dechlorination was observed at Fe/S molar ratio of ∼60 under alkaline condition. Spectroscopic analyses demonstrate that the enhanced TCE dechlorination was associated with the presence of FeS on the surface of S/NZVI. Dissolved oxygen had little effect on TCE dechlorination by S/NZVI, revealing that the FeS layer could be able to alleviate the surface passivation of NZVI caused by oxidation. Aging of S/NZVI up to 10–20 d only slightly decreased the dechlorination efficiency of TCE. Although an obvious drop in dechorination efficiency was observed for the S/NZVI aged for 30 d, it still exhibited a higher reactivity than the bare NZVI. This indicates that sulfidation of NZVI did prolong its lifetime. Additionally, sulfidation treatment was used to reactivate the aged NZVI, and the results show that the reactivated NZVI even had higher reactivity than the fresh NZVI, suggesting that sulfidation treatment would be a promising method to reactivate the aged NZVI. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112868
Appears in Collections: 气候减缓与适应
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作者单位: College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, China
Recommended Citation:
Dong H.,Zhang C.,Deng J.,et al. Factors influencing degradation of trichloroethylene by sulfide-modified nanoscale zero-valent iron in aqueous solution[J]. Water Research,2018-01-01,135