Influence of inherent iron and oxygen concentrations on selenite   sorption process using bentonite

doi:10.1007/s11426-017-9091-4

CORC > 北京大学 > 化学与分子工程学院

	Influence of inherent iron and oxygen concentrations on selenite sorption process using bentonite
	He, Jiangang ; Qiao, Xueling ; Shi, Yanlin ; Li, Yao ; Yang, Xiaoyu ; Zhou, Wanqiang ; Liu, Chunli
刊名	SCIENCE CHINA-CHEMISTRY
	2017
关键词	Se(IV) sorption ferric selenite green rust bentonite replacement XANES MONTMORILLONITE CLAY GREEN RUST REDUCTION FE(II) FE SPECTROSCOPY OXIDATION SMECTITE OXIDES 300-DEGREES-C
DOI	10.1007/s11426-017-9091-4
英文摘要	The oxygen concentration and inherent Fe in bentonite have a significant influence on the Se(IV) sorption process. In this study, the sorption of selenite on natural bentonite was investigated using a batch experiment method, and the distribution coefficient (K (d)) values were obtained in the pH range from 2.0 to 10.0 under oxic/anoxic conditions. The K (d) values always reached a maximum value at a pH of 4 under oxic conditions and at a pH of 8 under anoxic conditions; meanwhile, the K (d) value under anoxic conditions was larger than the value under oxic conditions, especially in regard to the maximum K (d) values. The oxygen conditions have a significant influence on the ratio of redox-sensitive Fe2+/Fe3+, which was closely related to the difference in the K (d) values under both oxic/anoxic conditions. Ferric selenite and green rust could be responsible for the maximum K (d) values under oxic/anoxic conditions. In the leaching experiments, we found that the Fe2+ in bentonite could replace Mg2+ and Al3+ in the octahedral sheet. Spectroscopy methods, such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) were used to characterize the surface properties of the samples after reaction. Overall, this study shows that the addition of Fe2+-containing materials into backfill/buffer materials under anoxic condition could enhance the sorption of Se-79(IV).; Special Foundation for High-level Radioactive Waste Disposal [2007-840, 2012-851]; National Natural Science Foundation of China [U1530112, 11475008, 11075006, 91026010]; SCI(E); ARTICLE; 9; 1258-1264; 60
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/471134]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	He, Jiangang,Qiao, Xueling,Shi, Yanlin,et al. Influence of inherent iron and oxygen concentrations on selenite sorption process using bentonite[J]. SCIENCE CHINA-CHEMISTRY,2017.
APA	He, Jiangang.,Qiao, Xueling.,Shi, Yanlin.,Li, Yao.,Yang, Xiaoyu.,...&Liu, Chunli.(2017).Influence of inherent iron and oxygen concentrations on selenite sorption process using bentonite.SCIENCE CHINA-CHEMISTRY.
MLA	He, Jiangang,et al."Influence of inherent iron and oxygen concentrations on selenite sorption process using bentonite".SCIENCE CHINA-CHEMISTRY (2017).