Abstract
The effect of calcination on geopolymer for the adsorption of cesium and related change of microstructure were explored. The sorption results indicated that the cesium sorption amounts of geopolymers after calcination dramatically decreased. However, the specific surface areas of accordingly calcined geopolymers increased significantly. Aluminum tetrahedrons are the source of negative charges for the adsorption of cesium. It was found that approximately 10% of tetrahedrally coordinated aluminum was transformed to penta-coordinated aluminum and hexa-coordinated aluminum after thermal treatment. Furthermore, approximately 10% of aluminum on the surface of calcined geopolymers decreased compared to raw geopolymer. Therefore, calcination has a great influence on the cesium sorption due to the decrease of aluminum tetrahedrons on the surface of geopolymer.
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