Journal
ENVIRONMENTAL ENGINEERING RESEARCH
Volume 27, Issue 2, Pages -Publisher
KOREAN SOC ENVIRONMENTAL ENGINEERS - KSEE
DOI: 10.4491/eer.2020.662
Keywords
Cesium; Coal fly ash; Crystallization; Strontium; Zeolitic materials
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2017R1D1A1B03030350]
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Zeolitic materials prepared from fused coal fly ash (CFA) using a hydrothermal method were found to have superior crystallinity and were effective in adsorbing Sr2+ and Cs+ in aqueous solutions.
The adsoiptive aqueous removal of Sr2+ and Cs+ was performed using zeolitic materials prepared with fused coal fly ash (CFA) using a hydrothermal method. The influence of the mass ratio of NaOH to CFA of 0.3-1.2 in the synthesis of zeolitic material was evaluated its crystallization properties by X-ray diffraction (XRD) analysis. The zeolitic materials synthesized at the mass ratio of NaOH to CFA of 0.6-1.2 could be identified to have the same location as the XRD peaks of Na-A zeolite at 2 theta = 7.18 - 34.18. They appeared to be zeolitic materials which were crystalline particles with a cubic structure by scanning electron microscopy (SEM). The experimental adsorption data for Sr2+ and Cs+ using the zeolitic materials were estimated satisfactory using pseudo-2nd-order kinetics and Langmuir isotherm models. The highest maximum adsorption capacities (q(m)) of 147.6 mgig for Sr2+ and 160.2 mg/g for Cs+ were estimated by using the zeolitic material. This material demostrated superior crystallinity and was synthesized at a mass ratio of NaOH to CFA of 0.6. Consequently, the zeolitic material prepared from the fused CFA through the hydrothermal method could be used effectively for the adsorption of Sr2+ and Cs+ in aqueous solutions.
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