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Int. J. Environ. Res. Public Health 2018, 15(1), 101; https://doi.org/10.3390/ijerph15010101

Adsorption Behavior and Mechanism for the Uptake of Fluoride Ions by Reed Residues

1
Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang’an University, Xi’an 710054, China
2
School of Environmental Science and Engineering, Chang’an University, Xi’an 710054, China
3
Liaoning Zhongwang Group Co., Ltd., Liaoyang 111003, China
4
School of Geography and Tourism, Shaanxi Normal University, Xi’an 710054, China
*
Author to whom correspondence should be addressed.
Received: 3 November 2017 / Revised: 4 January 2018 / Accepted: 6 January 2018 / Published: 9 January 2018
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Abstract

The adsorption behavior and mechanism for the uptake of fluoride ions by untreated and desugared reed residues (roots, stems and leaves) were studied through adsorption experiments, elemental analysis, infrared spectroscopy and surface area analysis. The results showed that the adsorption capacity of untreated and desugared reeds followed the order: desugared roots 2136 mg/kg > desugared leaves 1825 mg/kg > desugared stems 1551 mg/kg > untreated roots 191 mg/kg > untreated stems 175 mg/kg > untreated leaves 150 mg/kg, so adsorption capacity of desugared reeds was larger than that of the untreated reeds. The adsorption kinetic of fluoride ions followed a pseudo-first-order model. A Langmuir model could be used to fit the isothermal adsorption process which was a spontaneous endothermic reaction involving mainly physical adsorption. The ΔG for the uptake of fluoride by the desugared reeds was more negative, so the degree of spontaneity was higher than for the use of the untreated reeds. After samples were desugared, the specific surface area and aromaticity of the reed increased, while the polarity and hydrophilicity decreased, which explained the adsorption amount of desugared reed was higher than that of the untreated. This study enriches techniques and methods of removing fluoride ions from water. View Full-Text
Keywords: fluoride; reed; adsorption; desugared fluoride; reed; adsorption; desugared
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Song, R.; Yang, S.; Xu, H.; Wang, Z.; Chen, Y.; Wang, Y. Adsorption Behavior and Mechanism for the Uptake of Fluoride Ions by Reed Residues. Int. J. Environ. Res. Public Health 2018, 15, 101.

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