Surface spectroscopic studies of Cs+, and Ba2+ sorption on chlorite-illite mixed clay

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Surface spectroscopic studies of Cs+, and Ba2+ sorption on.pdf (121.06 KB)

Date

2000

Authors

Shahwan, T.
Sayan, S.
Erten, H. N.
Black, L.
Hallam, K. R.
Allen, G. C.

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Abstract

The sorption behavior of Cs+, and Ba2+ on natural clay was investigated using ToF-SIMS, XPS, and XRD. The natural clay was composed mainly of chlorite and illite in addition to quartz and calcite. Depth profiling up to 70 Å was performed at 10 Å steps utilizing ToF-SIMS to study the amount of sorbed Cs+ and Ba2+ as a function of depth in the clay matrix. The results suggest that Cs+ and Ba2+ ions were sorbed primarily by ion exchange coupled with hydrolytic sorption. According to ToF-SIMS and XPS results, the total sorbed amount of Ba2+ was larger than that of Cs+. Quantitative determination of the primary cations within the analyzed clay before and after sorption indicated that for Ba2+ sorption, Ca2+, Mg2+ and for Cs+ sorption Ca2+, K+ were the major exchanging ions. The XRD spectra of Ba-sorbed clay contained new peaks that were identified as BaCO3.

Source Title

Radiochimica Acta

Publisher

De Gruyter Oldenbourg

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Keywords

Ba2+, Chlorite, Cs+, Illite, Sorption, Tof-SIMS, XPS, XRD, Calcium carbonate, Cesium, Silicon dioxide, Sodium chlorite, Adsorption, Clay, Hydrolysis, Ion exchange, Radioactive waste, Spectroscopy, X ray analysis

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http://hdl.handle.net/11693/27634

Published Version (Please cite this version)

https://doi.org/10.1524/ract.2000.88.9-11.681

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Scholarly Publications - Chemistry

Language

English

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Article