Adsorption of Selenium and Strontium on Goethite: EXAFS Study and   Surface Complexation Modeling of the Ternary Systems

doi:10.1021/acs.est.6b06104

CORC > 北京大学 > 化学与分子工程学院

	Adsorption of Selenium and Strontium on Goethite: EXAFS Study and Surface Complexation Modeling of the Ternary Systems
	Nie, Zhe ; Finck, Nicolas ; Heberling, Frank ; Pruessmann, Tim ; Liu, Chunli ; Lutzenkirchen, Johannes
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2017
关键词	X-RAY-ABSORPTION CHARGE-DISTRIBUTION AMORPHOUS SILICA SORPTION SPECTROSCOPY INTERFACE OXYANIONS MECHANISM PHOSPHATE GEOMETRY
DOI	10.1021/acs.est.6b06104
英文摘要	Knowledge of the geochemical behavior of selenium and strontium is critical for the safe disposal of radioactive wastes. Goethite, as one of the most thermodynamically stable and commonly occurring natural iron oxyhydroxides, promisingly retains these elements. This work comprehensively studies the adsorption of Se(IV) and Sr(II) on goethite. Starting from electrokinetic measurements, the binary and ternary adsorption systems are investigated and systematically compared via batch experiments, EXAFS analysis, and CD-MUSIC modeling. Se(IV), forms bidentate, inner-sphere surface complexes, while Sr(II) is assumed to form, outer-sphere complexes at low and intermediate. pH and inner-sphere complexes at high pH. Instead of a direct interaction between Se(IV) and Sr(II),our results indicate an electrostatically,driven mutual enhancement of adsorption. Adsorption of Sr(II) is promoted by an average factor of 5 within the typical groundwater pH range from 6 to 8 for the concentration range studied here. However, the interaction between Se(IV) and Sr(II) at the surface is two-sided, Se(IV) promotes Sr(II) Outer-sphere adsorption, but competes for inner-sphere adsorption sites at high pH. The complexity.of surfaces is highlighted by the inability of adsorption models to predict isoelectric points without additional constraints.; China Scholarship Council (CSC); SCI(E); ARTICLE; 7; 3751-3758; 51
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/474091]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Nie, Zhe,Finck, Nicolas,Heberling, Frank,et al. Adsorption of Selenium and Strontium on Goethite: EXAFS Study and Surface Complexation Modeling of the Ternary Systems[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2017.
APA	Nie, Zhe,Finck, Nicolas,Heberling, Frank,Pruessmann, Tim,Liu, Chunli,&Lutzenkirchen, Johannes.(2017).Adsorption of Selenium and Strontium on Goethite: EXAFS Study and Surface Complexation Modeling of the Ternary Systems.ENVIRONMENTAL SCIENCE & TECHNOLOGY.
MLA	Nie, Zhe,et al."Adsorption of Selenium and Strontium on Goethite: EXAFS Study and Surface Complexation Modeling of the Ternary Systems".ENVIRONMENTAL SCIENCE & TECHNOLOGY (2017).