Adsorption of Fluoride by Natural Aluminosilicate Minerals

LU Chenglong; GOU Xiaoqin; HAN Haisheng; SUN Wei

doi:10.13779/j.cnki.issn1001-0076.2020.01.005

2020 Vol. 40, No. 1

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LU Chenglong, GOU Xiaoqin, HAN Haisheng, SUN Wei. Adsorption of Fluoride by Natural Aluminosilicate Minerals[J]. Conservation and Utilization of Mineral Resources, 2020, 40(1): 28-36. doi: 10.13779/j.cnki.issn1001-0076.2020.01.005

Citation:

LU Chenglong, GOU Xiaoqin, HAN Haisheng, SUN Wei. Adsorption of Fluoride by Natural Aluminosilicate Minerals[J]. Conservation and Utilization of Mineral Resources, 2020, 40(1): 28-36. doi: 10.13779/j.cnki.issn1001-0076.2020.01.005

Adsorption of Fluoride by Natural Aluminosilicate Minerals

School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China

Received Date: 25 October 2019

Publish Date: 25 February 2020

Abstract

Abstract

The fluorine-containing wastewater discharged from industrial production has great harm to the environment and human body. In this study, three kinds of natural aluminosilicate minerals, diaspore, gibbsite and kaolinite, are used as adsorbents to explore the feasibility of their adsorption of fluorine ions and the mechanism of defluorination. The single factor condition test showed that kaolinite had the best adsorption efficiency for fluoride ion. The removal rate of fluoride ion can reach 82.44% and the concentration of fluoride ion can be reduced from 150 mg/L to 26.34 mg/L under the optimum reaction conditions of granularity of Kaolinite -18 μm, dosage of 10 g/L, pH = 13, reaction time = 10 min and reaction temperature 25 ℃. Kinetic fitting showed that the removal of fluoride ion by kaolinite accorded with quasi-second-order kinetics with theoretical capacity value Q_e=8.0244 mg/g. The adsorption isotherms show that the reaction conforms to Freundlich model and belongs to single layer adsorption. XPS analysis shows that fluoride ion exchanges with hydroxyl groups in kaolinite, and Al-F bonds are formed on the surface of kaolinite, thus achieving the purification of fluoride-containing wastewater.
- fluorine-containing wastewater /
- natural aluminosilicate minerals /
- adsorption /
- dynamics simulation /
- XPS

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References

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