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[PY-34] Synthesis and Characterization of Zeolite A from Coal Fly Ash for Stabilization of Cs+ and Sr2+
Keywords:Fly ash, Zeolite A, Cesium and strontium ions, Structure, Solidification
Zeolite A was synthesized from coal fly ash as a cation exchanger for removal of Cs+ and Sr2+ which were surrogates of radionuclides from aqueous solutions in batch operation. A series of adsorption experiments of Cs+ and Sr2+ were conducted as a function of pH, contact time and initial ion concentration. Kinetic and thermodynamic models were applied to the rate and isotherm sorption data, resulting in the relevant kinetic and thermodynamic parameters. Importantly, the structures of Cs-loaded and Sr-loaded zeolites were revealed by XRD structural refinement. Meanwhile, the properties of them were determined through Fourier transform infrared spectroscopy (FTIR), Thermogravimetric analysis (TG-DTA) and analysis of nitrogen adsorption-desorption isotherm with a comparison of original zeolite. On the other hand, the solidifications of Cs-loaded and Sr-loaded zeolites by thermal treatment and geopolymerization were evaluated. The results showed that fly ash-based zeolite can be an alternative material for immobilization of Cs+ and Sr2+. The zeolite structure changed after loading Cs+ or Sr2+. Both techniques including thermal treatment and geopolymerization can be applied for solidification of Cs+ and Sr2+.
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