Comparison of Adsorption Capacity and Removal Efficiency of Strontium by Six Typical Adsorption Materials

Hu Li, Kexue Han, Jinhua Shang, Weihai Cai, Minghao Pan, Donghui Xu, Can Du and Rui Zuo
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Hu Li: Jinan Rail Transit Group Co., Ltd., Jinan 250000, China
Kexue Han: College of Water Sciences, Beijing Normal University, Beijing 100875, China
Jinhua Shang: Jinan Rail Transit Group Co., Ltd., Jinan 250000, China
Weihai Cai: College of Water Sciences, Beijing Normal University, Beijing 100875, China
Minghao Pan: College of Water Sciences, Beijing Normal University, Beijing 100875, China
Donghui Xu: College of Water Sciences, Beijing Normal University, Beijing 100875, China
Can Du: College of Water Sciences, Beijing Normal University, Beijing 100875, China
Rui Zuo: College of Water Sciences, Beijing Normal University, Beijing 100875, China

Sustainability, 2022, vol. 14, issue 13, 1-14

Abstract: The rapid development and application of nuclear technology have been accompanied by the production of large amounts of radioactive wastes, of which Sr is a typical nuclide. In this study, six typical materials with strong adsorption properties, namely activated carbon, kaolin, montmorillonite, bentonite, zeolite, and attapulgite, were selected. Their adsorption mechanisms were investigated by analyzing their adsorption isotherms, adsorption kinetics, micromorphologies, element contents, specific surface areas, crystal structures, and functional groups. The results showed that the adsorption efficiency of Sr by the six adsorbents can be ranked as zeolite, bentonite, attapulgite, montmorillonite, activated carbon, and kaolin, among which the maximum adsorption capacity of zeolite was 4.07 mg/g. Based on the adsorption kinetic and thermodynamic fitting results, the adsorption of Sr by zeolites, bentonite and attapulgite is consistent with Langmuir model, the pseudo-first-order and pseudo-second-order model, and the adsorption process of Sr (II) by montmorillonite, activated carbon and kaolinite is consistent with the Freundlich model and corresponds to non-uniform adsorption. The main mechanisms of the six materials are physical adsorption, ion exchange and complexation. In summary, zeolite, bentonite, and attapulgite, especially zeolite, are highly effective for the treatment of radioactive wastewater containing strontium and have great application value in the treatment of radioactive wastes.

Keywords: activated carbon; Kaolin; Montmorillonite; Bentonite; Zeolite; Attapulgite; Strontium; adsorption efficiency (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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