期刊
CHEMICAL ENGINEERING JOURNAL
卷 322, 期 -, 页码 246-253出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.03.155
关键词
Mg-Al-Zr triple-metal composite; Fluoride; Adsorption; Isotherm
资金
- National Natural Science Foundation of China [21407152, 31200439, 21590811]
- Guangdong Provincial Department of Science and Technology [2014B050505019]
Mg-Al-Zr triple-metal composite was fabricated by a facile co-precipitation method for fluoride removal. The as-prepared composite was characterized by various technologies. The adsorption experiment was carried out to investigate the fluoride removal performance. The results showed that the uncalcined Mg-Al-Zr composite exhibited the best fluoride removal capacity of 22.9 mg/g from the Langmuir isotherm model. The adsorption kinetics followed the pseudo-second-order model, and the adsorption isotherm could be better described by Langmuir and Freundlich isotherm model. In a wide pH range (3-10), the fluoride adsorption capacity of the composite was relatively high. Adsorption thermodynamics result indicated the adsorption process of fluoride onto Mg-Al-Zr composite was the endothermic reaction. The as-prepared composite exhibited the excellent fluoride removal ability in the real ground water and surface water. Based on the characterization, the fluoride removal mechanism onto the Mg-Al-Zr composite was proposed, including the ion-exchange by hydroxyl group and NO3 and the complexation by hydroxyl group. (C) 2017 Elsevier B.V. All rights reserved.
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