期刊
APPLIED SURFACE SCIENCE
卷 435, 期 -, 页码 920-927出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.11.108
关键词
Fluoride; Adsorption; Tri-metal hydroxide; Ion exchange; Ground water
类别
资金
- National Natural Science Foundation of China [21406182]
- Education Department of Sichuan Province [14ZA0104, 17ZB0443]
- Engineering Research Center for Biomass Resource Utilization and Modification of Sichuan Province [12zxsk11]
- Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory [15kffk02]
A novel layered Zr-Al-La tri-metal composite (AZL) was fabricated via co-precipitation method for fluoride removal. The as-prepared adsorbent was characterized by various technologies, and its adsorption behaviors to fluoride were thoroughly carried out to investigate the fluoride removal performance. The results showed that the layered structure existed and the AZL exhibited the maximum adsorption capacity of 90.48 mg g(-1) at 308 K and pH 3.0 from the Langmuir isotherm model. The adsorption kinetics was well fitted by the pseudo-second-order equation, and the adsorption isotherms were well described by the Langmuir equation. Adsorption thermodynamics result was indicative of endothermic reaction in the process of adsorption of AZL to fluoride. The as-prepared AZL composite has excellent fluoride removal performance for the practical ground water and satisfies the permissible limit of fluoride in drinking water recommended by Chinese Standard. In addition, based on the characterization, the adsorption mechanism of fluoride on AZL was proposed, including electrostatic interaction between the protonated surface of AZL and fluoride, as well as ion-exchange by hydroxyl group and fluoride. (c) 2017 Elsevier B.V. All rights reserved.
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