CAS OpenIR  > 中科院上海应用物理研究所2011-2018年
Role of dissolved oxygen in metal(loid) removal by zerovalent iron at different pH: its dependence on the removal mechanisms
Qin, HJ; Li, JX; Bao, QQ; Li, LN; Guan, XH; Guan, XH (reprint author), Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Shanghai 200092, Peoples R China.; Guan, XH (reprint author), Tongji Univ, Coll Environm Sci & Engn, Minist Educ, Key Lab Yangtze River Water Environm, Shanghai 200092, Peoples R China.
2016
Source PublicationRSC ADVANCES
ISSN2046-2069
Volume6Issue:55Pages:50144—50152
Subtype期刊文献
AbstractAlthough the influence of oxygen on contaminant sequestration by zerovalent iron (ZVI) has been investigated in quite a few studies, there are many conflicting results in the literature. The kinetics of the removal of five metal(loid)s (arsenate, copper ion, lead ion, selenite, and chromate) by ZVI was investigated under N-2, air, or O-2 purging conditions in well-mixed batch systems at pH buffered at either 4.0 or 6.0. We found that oxygen had very different influences on different metal(loid)s removal by ZVI at different pH. Cr(VI) was mainly reduced by Fe2+ rather than Fe-0 to Cr(III) at pH 4.0 and 6.0, thus its removal was favored under oxic conditions. The atmosphere favoring the transformation of Fe-0 to iron (hydr)oxides benefited the sequestration of As(V) because As(V) was removed by adsorption/coprecipitation. Pb(II) was removed via both direct reduction by Fe-0 and precipitation as PbO and thus the removal of Pb(II) by ZVI was most favored under N-2-purging conditions at pH 4.0 and 6.0. Cu(II) and Se(IV) were removed via direct reduction by Fe-0 at pH 4.0 but their removal mechanisms partially shifted from reduction to adsorption with increasing oxygen concentration at pH 6.0, resulting in a complex influence of oxygen on their removal. In summary, the role of oxygen in metal(loid)s removal by ZVI is strongly dependent on the removal mechanisms of metal(loid)s at different pH.
KeywordZero-valent Iron Weak Magnetic-field Permeable Reactive Barriers Groundwater Remediation Arsenite Removal Aqueous-solution Waste-water Reduction Kinetics Arsenate
DOI10.1039/c6ra08886d
Indexed BySCI
Language英语
WOS IDWOS:000377577800099
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/25827
Collection中科院上海应用物理研究所2011-2018年
Corresponding AuthorGuan, XH (reprint author), Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Shanghai 200092, Peoples R China.; Guan, XH (reprint author), Tongji Univ, Coll Environm Sci & Engn, Minist Educ, Key Lab Yangtze River Water Environm, Shanghai 200092, Peoples R China.
Recommended Citation
GB/T 7714
Qin, HJ,Li, JX,Bao, QQ,et al. Role of dissolved oxygen in metal(loid) removal by zerovalent iron at different pH: its dependence on the removal mechanisms[J]. RSC ADVANCES,2016,6(55):50144—50152.
APA Qin, HJ.,Li, JX.,Bao, QQ.,Li, LN.,Guan, XH.,...&Guan, XH .(2016).Role of dissolved oxygen in metal(loid) removal by zerovalent iron at different pH: its dependence on the removal mechanisms.RSC ADVANCES,6(55),50144—50152.
MLA Qin, HJ,et al."Role of dissolved oxygen in metal(loid) removal by zerovalent iron at different pH: its dependence on the removal mechanisms".RSC ADVANCES 6.55(2016):50144—50152.
Files in This Item: Download All
File Name/Size DocType Version Access License
Role of dissolved ox(468KB)期刊论文作者接受稿开放获取CC BY-NC-SAView Download
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Qin, HJ]'s Articles
[Li, JX]'s Articles
[Bao, QQ]'s Articles
Baidu academic
Similar articles in Baidu academic
[Qin, HJ]'s Articles
[Li, JX]'s Articles
[Bao, QQ]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Qin, HJ]'s Articles
[Li, JX]'s Articles
[Bao, QQ]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: Role of dissolved oxygen in metal(loid) removal by zerovalent iron at different pH its dependence on the removal mechanisms.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.