Enhanced removal of Cr(VI) by biochar with Fe as electron shuttles

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境化学与生态毒理学国家重点实验室

	Enhanced removal of Cr(VI) by biochar with Fe as electron shuttles
	Xu, Jingwen ; Yin, Yongguang ; Tan, Zhiqiang ; Wang, Bowen ; Guo, Xiaoru ; Li, Xia ; Liu, Jingfu
刊名	JOURNAL OF ENVIRONMENTAL SCIENCES
	2019-04
卷号	78 页码:109-117
关键词	Biochar Electron shuttle Fe(III) Reduction Cr(VI)
ISSN号	1001-0742
英文摘要	Biochar is extensively used as an effective soil amendment for environmental remediation. In addition to its strong contaminant sorption capability, biochar also plays an important role in chemical transformation of contaminant due to its inherent redox-active moieties. However, the transformation efficiency of inorganic contaminants is generally very limited when the direct adsorption of contaminants on biochar is inefficient. The present study demonstrates the role of Fe ion as an electron shuttle to enhance Cr(VI) reduction by biochars. Batch experiments were conducted to examine the effects of Fe(III) levels, pyrolysis temperature of biochar, initial solution pH, and biochar dosage on the efficiency of Cr(VI) removal. Results showed a significant enhancement in Cr(VI) reduction with an increase in Fe(III) concentration and a decrease of initial pH. Biochar produced at higher pyrolysis temperatures (e.g., 700 degrees C) favored Cr(VI) removal, especially in the presence of Fe (III), while a higher biochar dosage proved unfavorable likely due to the agglomeration or precipitation of biochar. Speciation analysis of Fe and Cr elements on the surface of biochar and in the solution further confirmed the role of Fe ion as an electron shuttle between biochar and Cr(VI). The present findings provide a potential strategy for the advanced treatment of Cr(VI) at low concentrations as well as an insight into the environmental fate of Cr(VI) and other micro-pollutants in soil or aqueous compartments containing Fe and natural or engineered carbonaceous materials. (c) 2018 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/42941]
专题	生态环境研究中心_环境化学与生态毒理学国家重点实验室
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Liaoning Univ, Sch Environm Sci, Shenyang 110036, Liaoning, Peoples R China 3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	Xu, Jingwen,Yin, Yongguang,Tan, Zhiqiang,et al. Enhanced removal of Cr(VI) by biochar with Fe as electron shuttles[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2019,78:109-117.
APA	Xu, Jingwen.,Yin, Yongguang.,Tan, Zhiqiang.,Wang, Bowen.,Guo, Xiaoru.,...&Liu, Jingfu.(2019).Enhanced removal of Cr(VI) by biochar with Fe as electron shuttles.JOURNAL OF ENVIRONMENTAL SCIENCES,78,109-117.
MLA	Xu, Jingwen,et al."Enhanced removal of Cr(VI) by biochar with Fe as electron shuttles".JOURNAL OF ENVIRONMENTAL SCIENCES 78(2019):109-117.