Characterization of silver-kaolinite (AgK): an adsorbent for long-lived I-129 species

Sadasivam, Sivachidambaram and Rao, Sudhakar M (2016) Characterization of silver-kaolinite (AgK): an adsorbent for long-lived I-129 species. In: SPRINGERPLUS, 5 .

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Abstract

Bentonite is a preferred buffer and backfill material for deep geological disposal of high-level nuclear waste (HLW). Bentonite does not retain anions by virtue of its negatively charged basal surface. Imparting anion retention ability to bentonite is important to enable the expansive clay to retain long-lived I-129 (iodine-129; half-life = 16 million years) species that may escape from the HLW geological repository. Silver-kaolinite (AgK) material is prepared as an additive to improve the iodide retention capacity of bentonite. The AgK is prepared by heating kaolinite-silver nitrate mix at 400 degrees C to study the kaolinite influence on the transition metal ion when reacting at its dehydroxylation temperature. Thermo gravimetric-Evolved Gas Detection analysis, X-ray diffraction analysis, X-ray photo electron spectroscopy and electron probe micro analysis indicated that silver occurs as AgO/Ag2O surface coating on thermally reacting kaolinite with silver nitrate at 400 degrees C.

Item Type:	Journal Article
Publication:	SPRINGERPLUS
Publisher:	SPRINGER INTERNATIONAL PUBLISHING AG
Additional Information:	Copy right for this article belongs to the SPRINGER INTERNATIONAL PUBLISHING AG, GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND
Keywords:	Kaolinte; Silver; Thermal reaction; XPS; Radioactive waste
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	02 Apr 2016 05:45
Last Modified:	16 Oct 2018 07:33
URI:	http://eprints.iisc.ac.in/id/eprint/53592

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