Enhancing the effect of bisulfite on sequestration of selenite by zerovalent iron
Li, JX; Wang, C; Qiao, JL; Qin, HJ; Li, LN; Qiao, JL (reprint author), Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Shanghai 200092, Peoples R China.
2015
发表期刊RSC ADVANCES
ISSN2046-2069
卷号5期号:93页码:76032—76039
文章类型期刊文献
摘要The enhancing effect of bisulfite (HSO3-) on the kinetics of Se(IV) sequestration by zerovalent iron (ZVI) was systematically investigated as a function of headspace volume, HSO3- concentration and initial pH (pH(ini)). To exclude the role of HSO3- as an electrolyte, the kinetics of Se(IV) removal by ZVI with the presence of SO42- was determined as a control. With increasing headspace volume from 0 to 2.0 mL, the rate of Se(IV) removal by ZVI experienced a considerable enhancement whereas the further increase in the headspace volume resulted in a drop in Se(IV) removal rate. Se(IV) was always removed by ZVI with a higher rate in the presence of HSO3- than that in the presence of SO42- at various headspace volumes, which was mainly ascribed to the release of H+ and the depletion of O-2 from the oxidation of HSO3- (i.e., 2HSO(3)(-) + O-2 -> 2SO(4)(2-) + 2H(+)). Furthermore, HSO3- accelerated the reduction of ferric oxides and hydroxides to a Fe(II)-containing solid intermediate, which was beneficial to the reductive removal of Se(IV). The SEM, Fe K-edge XAFS and Se XANES analysis for Se(IV)-treated ZVI samples confirmed that HSO3- facilitated the transformation of ZVI to iron(oxyhydr)oxides (e.g., magnetite and lepidocrocite) and the reduction of Se(IV) to Se(0) compared to SO42-. The enhancing effect of HSO3- on Se(IV) sequestration varied with the concentration of HSO3- and initial pH, with the greatest effect achieved at 2.0 mM of Se(IV) and pH(ini) 5.0. Since bisulfite is inexpensive and its final product is sulfate, a common anion existing in water, taking advantage of bisulfite to enhance the ZVI's reactivity under limited oxygenated conditions is a promising method.
关键词Zero-valent Iron Permeable Reactive Barriers Weak Magnetic-field Carbon-tetrachloride Arsenite Removal Elemental Iron Low Ph Reduction Water Kinetics
收录类别SCI
语种英语
WOS记录号WOS:000361387300021
引用统计
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/24922
专题中科院上海应用物理研究所2011-2018年
通讯作者Qiao, JL (reprint author), Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Shanghai 200092, Peoples R China.
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GB/T 7714
Li, JX,Wang, C,Qiao, JL,et al. Enhancing the effect of bisulfite on sequestration of selenite by zerovalent iron[J]. RSC ADVANCES,2015,5(93):76032—76039.
APA Li, JX,Wang, C,Qiao, JL,Qin, HJ,Li, LN,&Qiao, JL .(2015).Enhancing the effect of bisulfite on sequestration of selenite by zerovalent iron.RSC ADVANCES,5(93),76032—76039.
MLA Li, JX,et al."Enhancing the effect of bisulfite on sequestration of selenite by zerovalent iron".RSC ADVANCES 5.93(2015):76032—76039.
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