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Weak magnetic field accelerates chromate removal by zero-valent iron
Feng, P; Guan, XH; Sun, YK; Choi, WY; Qin, HJ; Wang, JM; Qiao, JL; Li, LN
2015
Source PublicationJOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
Volume31Pages:175—183
Subtype期刊文献
AbstractWeak magnetic field (WMF) was employed to improve the removal of Cr(VI) by zero-valent iron (ZVI) for the first time. The removal rate of Cr(VI) was elevated by a factor of 1.12-5.89 due to the application of a WMF, and the WMF-induced improvement was more remarkable at higher Cr(VI) concentration and higher pH. Fe2+ was not detected until Cr(VI) was exhausted, and there was a positive correlation between the WMF-induced promotion factor of Cr(VI) removal rate and that of Fe2+ release rate in the absence of Cr(VI) at pH 4.0-5.5. These phenomena imply that ZVI corrosion with Fe2+ release was the limiting step in the process of Cr(VI) removal. The superimposed WMF had negligible influence on the apparent activation energy of Cr(VI) removal by ZVI, indicating that WMF accelerated Cr(VI) removal by ZVI but did not change the mechanism. The passive layer formed with WMF was much more porous than without WMF, thereby facilitating mass transport. Therefore, WMF could accelerate ZVI corrosion and alleviate the detrimental effects of the passive layer, resulting in more rapid removal of Cr(VI) by ZVI. Exploiting the magnetic memory of ZVI, a two-stage process consisting of a small reactor with WMF for ZVI magnetization and a large reactor for removing contaminants by magnetized ZVI can be employed as a new method of ZVI-mediated remediation. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
KeywordHexavalent Chromium Reduction Nanoscale Zerovalent Iron In-situ Selenite Removal Scrap Iron Kinetics Water Cr(Vi) Remediation Ph
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/24624
Collection中科院上海应用物理研究所2011-2020年
Recommended Citation
GB/T 7714
Feng, P,Guan, XH,Sun, YK,et al. Weak magnetic field accelerates chromate removal by zero-valent iron[J]. JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,2015,31:175—183.
APA Feng, P.,Guan, XH.,Sun, YK.,Choi, WY.,Qin, HJ.,...&Li, LN.(2015).Weak magnetic field accelerates chromate removal by zero-valent iron.JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,31,175—183.
MLA Feng, P,et al."Weak magnetic field accelerates chromate removal by zero-valent iron".JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA 31(2015):175—183.
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