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DOI: https://doi.org/10.4491/eer.2022.010
Enhancing the adsorption function of F- by iron and zirconium doped zeolite: Characterization and parameter optimization
Bo Yang1, Chaomin Jia1, Guirong Sun1, Bingxu Quan1, Chunhui Zhang1, Qianqian Huo1, and Peidong Su2
1College of Chemistry and Environmental Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China
2Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
Corresponding Author: Chunhui Zhang ,Tel: 86 18518310996 , Fax: 010-6233 9331, Email: spd1194042797@gmail.com
Peidong Su ,Tel: 86 18518310996 , Fax: 010-6233 9331, Email: spd1194042797@gmail.com
Received: January 5, 2022;  Accepted: April 17, 2022.
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This study presented an original study on the F- removal by Fe and Zr doped Gismondine-dominated Zeolite. Various modified zeolites are prepared by systematically adjusting the synthesis variables, namely pH, mass ratio of zeolite to modify agent (mZeolite:m(Fe+Zr)), mass ratio of Fe to Zr (Fe:Zr) to investigate their effects on the F- adsorption. The performance of prepared Fe-Zr-Zeolite on F- removal was examined through both statistic adsorption and dynamic adsorption. Results indicated that when the modified pH was 7, the Fe:Zr ratio was 1:1 and mZeolite:m(Fe+Zr) was 1:2, the modified natural zeolites which was named Fe-Zr-Zeolite showed the best removal efficiency on F-. Fe-Zr-Zeolite could remove over 80% when the initial concentration was less than 20 mg/L and F- adsorption followed pseudo-second-order adsorption kinetic and Langmuir adsorption isotherm, indicating that F- adsorption by Fe-Zr-Zeolite was chemically dominated. Besides, Fe-Zr-Zeolite had better removal efficiency of F- under acidic conditions than that under alkaline conditions, and the competing anions, typically, Cl-, NO3- and SO42- had negligible effect on F- removal by Fe-Zr-Zeolite. The dynamic adsorption test demonstrated that in order to maintain the high removal efficiency of F-, the filling thickness of Fe-Zr-Zeolite should be at least 30 cm and the small the flow rate is, the higher the F- removal efficiency will be.
Keywords: Adsorption | Defluoridation | F- pollution | Zeolite | Zirconium
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