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题名:
Role of dissolved oxygen in metal(loid) removal by zerovalent iron at different pH: its dependence on the removal mechanisms
作者: Qin, HJ; Li, JX; Bao, QQ; Li, LN; Guan, XH
刊名: RSC ADVANCES
出版日期: 2016
卷号: 6, 期号:55, 页码:50144—50152
关键词: ZERO-VALENT IRON ; WEAK MAGNETIC-FIELD ; PERMEABLE REACTIVE BARRIERS ; GROUNDWATER REMEDIATION ; ARSENITE REMOVAL ; AQUEOUS-SOLUTION ; WASTE-WATER ; REDUCTION ; KINETICS ; ARSENATE
DOI: 10.1039/c6ra08886d
通讯作者: 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.
文章类型: 期刊文献
英文摘要: Although 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.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000377577800099
ISSN号: 2046-2069
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/25827
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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Recommended Citation:
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,2016-01-01,6(55):50144—50152.
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