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DOI: https://doi.org/10.4491/eer.2020.662
Evaluation of Sr and Cs ions adsorption capacities with zeolitic materials synthesized from various mass ratios of NaOH to coal fly ash
Jeong-Hak Choi1, and Chang-Han Lee2
1Department of Environmental Engineering, Catholic University of Pusan, Busan 46252, Korea
2Department of Environmental Administration, Catholic University of Pusan, Busan 46252, Korea
Corresponding Author: Chang-Han Lee ,Tel: +82-51-510-0624 , Email: chlee@cup.ac.kr
Received: November 29, 2020;  Accepted: February 13, 2021.
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ABSTRACT
The adsorptive 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 2θ = 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 (qm) of 147.6 mg/g 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.
Keywords: Coal fly ash | Crystallization | Strontium | Cesium | Zeolitic materials
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