Cesium and Strontium Retentions Governed by Aluminosilicate Gel in Alkali-Activated Cements.

Author(s) Jang, J.Gook; Park, S.Moi; Lee, H.Ki
Journal Materials (Basel)
Date Published 2017 Apr 23
Abstract

The present study investigates the retention mechanisms of cesium and strontium for alkali-activated cements. Retention mechanisms such as adsorption and precipitation were examined in light of chemical interactions. Batch adsorption experiments and multi-technical characterizations by using X-ray diffraction, zeta potential measurements, and the N₂ gas adsorption/desorption methods were conducted for this purpose. Strontium was found to crystalize in alkali-activated cements, while no cesium-bearing crystalline phases were detected. The adsorption kinetics of alkali-activated cements having relatively high adsorption capacities were compatible with pseudo-second-order kinetic model, thereby suggesting that it is governed by complex multistep adsorption. The results provide new insight, demonstrating that characteristics of aluminosilicate gel with a highly negatively charged surface and high micropore surface area facilitated more effective immobilization of cesium and strontium in comparison with calcium silicate hydrates.

DOI 10.3390/ma10040447
ISSN 1996-1944
Citation Jang JG, Park SM, Lee HK. Cesium and Strontium Retentions Governed by Aluminosilicate Gel in Alkali-Activated Cements. Materials (Basel). 2017;10(4).

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