DOI: 10.1016/j.watres.2017.11.002
Scopus记录号: 2-s2.0-85032971113
论文题名: Physicochemical transformation of Fe/Ni bimetallic nanoparticles during aging in simulated groundwater and the consequent effect on contaminant removal
作者: Dong H. ; Jiang Z. ; Deng J. ; Zhang C. ; Cheng Y. ; Hou K. ; Zhang L. ; Tang L. ; Zeng G.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 129 起始页码: 51
结束页码: 57
语种: 英语
英文关键词: Aging
; Bimetallic nanoparticles
; Characterization
; Reactivity
; Transformation
Scopus关键词: Aging of materials
; Characterization
; Gamma rays
; Groundwater
; Groundwater pollution
; Hematite
; Magnetite
; Nickel
; Reactivity (nuclear)
; Redox reactions
; Scanning electron microscopy
; Spectrometers
; X ray diffraction analysis
; Bimetallic nanoparticles
; Energy dispersive spectrometers
; Ground water remediation
; Physicochemical transformation
; Scanning electron microscopy image
; Simulated ground water
; Structural transformation
; Transformation
; Nanoparticles
; ferric oxide
; ferrous ion
; ground water
; iron nanoparticle
; magnetite
; nickel nanoparticle
; tetracycline
; ferric ion
; ferric oxide
; ground water
; iron
; metal nanoparticle
; nanoparticle
; nickel
; adsorption
; aging
; chemical property
; efficiency measurement
; environmental fate
; groundwater
; iron
; maghemite
; magnetite
; nanoparticle
; nickel
; physicochemical property
; pollutant removal
; transformation
; adsorption
; aging
; Article
; bioremediation
; controlled study
; corrosion
; energy dispersive X ray spectroscopy
; mass
; oxidation reduction potential
; pH
; physical chemistry
; priority journal
; scanning electron microscopy
; simulation
; surface property
; waste component removal
; water contamination
; X ray diffraction
; chemistry
; isolation and purification
; oxidation reduction reaction
; water pollutant
; Adsorption
; Ferric Compounds
; Groundwater
; Iron
; Metal Nanoparticles
; Microscopy, Electron, Scanning
; Nanoparticles
; Nickel
; Oxidation-Reduction
; Tetracycline
; Water Pollutants, Chemical
; X-Ray Diffraction
英文摘要: To assess the fate and long-term reactivity of bimetallic nanoparticles used in groundwater remediation, it is important to trace the physicochemical transformation of nanoparticles during aging in water. This study investigated the short-term (within 5 d) and long-term (up to 90 d) aging process of Fe/Ni bimetallic nanoparticles (Fe/Ni BNPs) in simulated groundwater and the consequent effect on the particle reactivity. Results indicate that the morphological, compositional and structural transformation of Fe/Ni BNPs happened during the aging. In the 5-d short-term aging, Fe0 corrosion occurred rapidly and was transformed to ferrous ions which were adsorbed onto the surface of Fe/Ni BNPs, accompanied by the elevation of solution pH and the negative redox potential. In the long-term aging, scanning electron microscopy (SEM) images show that the particles transformed from spherical to rod-like and further to sheet-like and needle-like. X-ray diffraction (XRD) analysis reveals that the main aging product was magnetite (Fe3O4) and/or maghemite (γ-Fe2O3) after aging for 60–90 d. Energy dispersive spectrometer (EDS) analysis demonstrates that the mass ratio of Fe/Ni increased with aging, revealing that Ni were possibly gradually entrapped and covered by the iron oxides. Besides, the release of Ni into solution was also detected during the aging. The reactivity of the aged Fe/Ni BNPs was examined by studying its performance in tetracycline (TC) removal. The aged Fe/Ni BNPs within 2 d kept similar removal efficiency of TC as the fresh particles. However, the removal efficiency of TC by Fe/Ni BNPs aged for 5–15 d dropped by 20–50% due to aggregation and oxidation of particles, and the removal efficiency further decreased slowly with the prolongation of aging time up to 90 d. This reveals that Fe/Ni BNPs were vulnerable to passivation in water environments. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113083
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.,Jiang Z.,Deng J.,et al. Physicochemical transformation of Fe/Ni bimetallic nanoparticles during aging in simulated groundwater and the consequent effect on contaminant removal[J]. Water Research,2018-01-01,129