Sorption of Se(IV) and Se(VI) to coal fly ash/cement composite: Effect   of Cat(2+) and high ionic strength

doi:10.1016/j.chemgeo.2016.12.041

CORC > 北京大学 > 环境科学与工程学院

	Sorption of Se(IV) and Se(VI) to coal fly ash/cement composite: Effect of Cat(2+) and high ionic strength
	Sun, Weiling ; Renew, Jay E. ; Zhang, Wenlong ; Tang, Yuanzhi ; Huang, Ching-Hua
刊名	20-Year Anniversary Symposium on Adsorption of Metals by Geomedia III held at the 251st National Spring Meeting of the American-Chemical-Society (ACS)
	2017
关键词	Selenate Selenite FGD wastewater Coal fly ash Sorption mechanism Se immobilization X-RAY-ABSORPTION AQUEOUS-SOLUTION ADSORPTION MECHANISMS SELENATE ADSORPTION SELENIUM OXYANIONS COBALT SORPTION CEMENT MINERALS IRON-OXIDES COMPLEXES SPECTROSCOPY
DOI	10.1016/j.chemgeo.2016.12.041
英文摘要	The sorption behavior and mechanisms of Se from wastewater with high salinity are unclear, a scenario that can be encountered in the flue-gas-desulfurization (FGD) blowdown at coal-fired power plants. In this study, we investigated the uptake behavior and mechanisms of Se(IV) and Se(VI) by a coal fly ash/cement composite at high ionic strengths (IS) of up to 3.0 M NaCl or CaCl2 using batch sorption experiments, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and X-ray absorption spectroscopy. NaCl, regardless of IS, only caused slight changes in Se(IV) and Se(VI) uptake. Presence of CaCl2 significantly enhanced Se(IV) uptake, but had minor effect at low IS (<= 03 M) and no effect at high IS (> 0.3 M) on Se(VI) uptake. Both Se(IV) and Se(VI) mainly formed outer-sphere surface complexes in the presence of NaCl. The enhanced Se(IV) uptake by CaCl2 is likely due to the formation of Ca-SeO3 precipitate(s). Outer-sphere complexation is the main mechanism for Se(VI) sorption in the presence of CaCl2, with additional formation of minor amounts of inner-sphere complex at IS > 03 M. The results added new mechanistic insights for Se removal from industrial wastewaters with high salinity and will be useful for immobilization of Se in the co-management of FGD blow down and coal fly ash wastes. (C) 2016 Published by Elsevier B.V.; China Scholarship Council [201206015012]; Environmental Research and Education Foundation; Argonne National Laboratory [DE-AC02-06CH11357]; SCI(E); ARTICLE; 76-83; 464
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/471584]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Sun, Weiling,Renew, Jay E.,Zhang, Wenlong,et al. Sorption of Se(IV) and Se(VI) to coal fly ash/cement composite: Effect of Cat(2+) and high ionic strength[J]. 20-Year Anniversary Symposium on Adsorption of Metals by Geomedia III held at the 251st National Spring Meeting of the American-Chemical-Society (ACS),2017.
APA	Sun, Weiling,Renew, Jay E.,Zhang, Wenlong,Tang, Yuanzhi,&Huang, Ching-Hua.(2017).Sorption of Se(IV) and Se(VI) to coal fly ash/cement composite: Effect of Cat(2+) and high ionic strength.20-Year Anniversary Symposium on Adsorption of Metals by Geomedia III held at the 251st National Spring Meeting of the American-Chemical-Society (ACS).
MLA	Sun, Weiling,et al."Sorption of Se(IV) and Se(VI) to coal fly ash/cement composite: Effect of Cat(2+) and high ionic strength".20-Year Anniversary Symposium on Adsorption of Metals by Geomedia III held at the 251st National Spring Meeting of the American-Chemical-Society (ACS) (2017).