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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ABSTRACT |
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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