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The double influence mechanism of pH on arsenic removal by nano zero valent iron: electrostatic interactions and the corrosion of Fe-0
Wu, C; Tu, JW; Liu, WZ; Zhang, J; Chu, SQ; Lu, GN; Lin, Z; Dang, Z; Zhang J(张静); Chu SQ(储胜启)
2017
Source PublicationENVIRONMENTAL SCIENCE-NANO
ISSN2051-8153
EISSN2051-8161
Volume4Issue:7Pages:1544-1552
SubtypeArticle
AbstractThe pH has a significant impact on arsenic (As) removal by nano zero valent iron (nZVI). However, most studies consider the influence mechanism just from the aspect of electrostatic interactions. In this study, based on the different As(V) adsorption capacity of nZVI and zero valent iron (ZVI) after normalization by specific surface area, we deeply analyze the comprehensive mechanism of arsenic adsorption by nZVI at varying pH values. Batch experiment shows that pH variation has a weaker influence on the As(V) adsorption by nZVI compared to ZVI. X-ray diffraction (XRD) and X-ray absorption near-edge structure (XANES) analysis indicated that with the coexistence of low concentration As(V) species, the increasing pH value condition does not significantly change the phase of ZVI; however, it decreases the lepidocrocite (gamma-FeOOH) and increases the magnetite/maghemite (Fe3O4/gamma-Fe2O3) content in the corrosion products of nZVI, while the latter has stronger adsorption affinity to As(V). An increase in the solution pH causes a change in the nature of the corrosion products, enhancing the adsorption affinity of nZVI towards As(V), which complements the negative impact from electrostatic repulsive-force. This study clearly demonstrated that the corrosion of nZVI plays a more important role in As(V) adsorption compared to electrostatic interactions. This indicates that nZVI is a promising nanomaterial with unique properties that aid in the removal of As(V) in a broad pH range and complicated environment.
DOI10.1039/c7en00240h
WOS KeywordREMEDIATION ; NANOPARTICLES ; GROUNDWATER ; REDUCTION ; WATER ; TRANSFORMATION ; DESORPTION ; MAGNETITE ; TOXICITY ; SORPTION
Indexed BySCI ; SCOPUS
Language英语
WOS Research AreaChemistry ; Environmental Sciences & Ecology ; Science & Technology - Other Topics
WOS SubjectChemistry, Multidisciplinary ; Environmental Sciences ; Nanoscience & Nanotechnology
WOS IDWOS:000405382700010
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/285233
Collection多学科研究中心
粒子天体物理中心
Affiliation中国科学院高能物理研究所
First Author AffilicationInstitute of High Energy
Recommended Citation
GB/T 7714
Wu, C,Tu, JW,Liu, WZ,et al. The double influence mechanism of pH on arsenic removal by nano zero valent iron: electrostatic interactions and the corrosion of Fe-0[J]. ENVIRONMENTAL SCIENCE-NANO,2017,4(7):1544-1552.
APA Wu, C.,Tu, JW.,Liu, WZ.,Zhang, J.,Chu, SQ.,...&储胜启.(2017).The double influence mechanism of pH on arsenic removal by nano zero valent iron: electrostatic interactions and the corrosion of Fe-0.ENVIRONMENTAL SCIENCE-NANO,4(7),1544-1552.
MLA Wu, C,et al."The double influence mechanism of pH on arsenic removal by nano zero valent iron: electrostatic interactions and the corrosion of Fe-0".ENVIRONMENTAL SCIENCE-NANO 4.7(2017):1544-1552.
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