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
发表期刊RSC ADVANCES
ISSN2046-2069
卷号6期号:55页码:50144—50152
文章类型期刊文献
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.
关键词Zero-valent Iron Weak Magnetic-field Permeable Reactive Barriers Groundwater Remediation Arsenite Removal Aqueous-solution Waste-water Reduction Kinetics Arsenate
DOI10.1039/c6ra08886d
收录类别SCI
语种英语
WOS记录号WOS:000377577800099
引用统计
被引频次:9[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/25827
专题中科院上海应用物理研究所2011-2018年
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.
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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.
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