Influence of Fe(II) on the Se(IV) sorption under oxic/anoxic conditions using bentonite

doi:10.1016/j.chemosphere.2017.10.143

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	Influence of Fe(II) on the Se(IV) sorption under oxic/anoxic conditions using bentonite
	He, Jiangang; Shi, Yanlin; Yang, Xiaoyu; Zhou, Wanqiang; Li, Yao; Liu, Chunli
刊名	CHEMOSPHERE
	2018-02-01
卷号	193 页码:376-384
关键词	Se(Iv) Sorption Ferric Selenite Reduction Fe(Oh)(2) Xanes
ISSN号	0045-6535
DOI	10.1016/j.chemosphere.2017.10.143
英文摘要	Se-79, one of the key radionuclides for nuclear waste disposal, threatens the quality of the environment, as well as human health. Therefore, it needs to be permanently isolated from the biosphere. The aim of the study was to investigate the effects of Fe(II)/Fe(III) on the removal of Se-79 using bentonite in the pH range of 2.0-10.0 under oxic/anoxic conditions. Under oxic conditions, Se(IV) prefers to form inner-sphere complexes with Fe(III)-oxyhydroxide, derived from the oxidization of Fe(II) using oxygen. Interestingly, Se(IV) will interact with Fe(III) and form a poorly soluble ferric selenite at pH similar to 4 under oxic conditions. Under anoxic conditions, however, the concentration of Fe(II) is closely related to the sorption process of Se(IV) on bentonite. When the concentration of Fe(II) was less than 1%, Fe(II) combined with the hydroxyl, forming Fe(OH)(2), which generated a disproportionation at pH similar to 8 and formed a new sorbent, Fe3O4. However, when the concentration of Fe(II) was increased to 5%, reduction precipitation was the primary way to remove Se(IV) in aqueous solution. XANES (X-ray Absorption Near Edge Structure) spectra showed that higher pH values are beneficial for the formation of the final thermodynamic reduction product, Fe selenide. These results suggested that Fe(II) significantly affect the Se(IV) sorption. Overall, this study confirmed the significant role of Fe(II) on the retardation of Se-79 and on remediation for Se(IV) contamination in the hydrosphere. (C) 2017 Elsevier Ltd. All rights reserved.
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000423890500046
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/45469]
专题	中国科学院化学研究所
通讯作者	Liu, Chunli
作者单位	Peking Univ, Coll Chem & Mol Engn, Fundamental Sci Lab Radiochem & Radiat Chem, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	He, Jiangang,Shi, Yanlin,Yang, Xiaoyu,et al. Influence of Fe(II) on the Se(IV) sorption under oxic/anoxic conditions using bentonite[J]. CHEMOSPHERE,2018,193:376-384.
APA	He, Jiangang,Shi, Yanlin,Yang, Xiaoyu,Zhou, Wanqiang,Li, Yao,&Liu, Chunli.(2018).Influence of Fe(II) on the Se(IV) sorption under oxic/anoxic conditions using bentonite.CHEMOSPHERE,193,376-384.
MLA	He, Jiangang,et al."Influence of Fe(II) on the Se(IV) sorption under oxic/anoxic conditions using bentonite".CHEMOSPHERE 193(2018):376-384.