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

Author

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  • Rong Song

    (Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang’an University, Xi’an 710054, China
    School of Environmental Science and Engineering, Chang’an University, Xi’an 710054, China)

  • Shengke Yang

    (Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang’an University, Xi’an 710054, China
    School of Environmental Science and Engineering, Chang’an University, Xi’an 710054, China)

  • Haiyang Xu

    (Liaoning Zhongwang Group Co., Ltd., Liaoyang 111003, China)

  • Zongzhou Wang

    (Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang’an University, Xi’an 710054, China
    School of Environmental Science and Engineering, Chang’an University, Xi’an 710054, China)

  • Yangyang Chen

    (Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang’an University, Xi’an 710054, China
    School of Environmental Science and Engineering, Chang’an University, Xi’an 710054, China)

  • Yanhua Wang

    (School of Geography and Tourism, Shaanxi Normal University, Xi’an 710054, China)

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.

Suggested Citation

  • Rong Song & Shengke Yang & Haiyang Xu & Zongzhou Wang & Yangyang Chen & Yanhua Wang, 2018. "Adsorption Behavior and Mechanism for the Uptake of Fluoride Ions by Reed Residues," IJERPH, MDPI, vol. 15(1), pages 1-12, January.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:1:p:101-:d:126119
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    Citations

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    Cited by:

    1. Min Zhou & Tao Zhu & Xiaohua Fei, 2018. "Enhanced Adsorption Performance of Oxytetracycline by Desugared Reed Residues," IJERPH, MDPI, vol. 15(10), pages 1-12, October.
    2. Ying Li & Shengke Yang & Qianli Jiang & Jie Fang & Wenke Wang & Yanhua Wang, 2018. "The Adsorptive Removal of Fluoride from Aqueous Solution by Modified Sludge: Optimization Using Response Surface Methodology," IJERPH, MDPI, vol. 15(4), pages 1-14, April.
    3. Li Liu & Shisuo Fan & Yang Li, 2018. "Removal Behavior of Methylene Blue from Aqueous Solution by Tea Waste: Kinetics, Isotherms and Mechanism," IJERPH, MDPI, vol. 15(7), pages 1-16, June.
    4. Haodong Zhang & Zhan Yang & Jiawang Tian & Changyi Liu & Zhe Qin, 2024. "Enhanced Nitrate Nitrogen Removal from Wastewater Using Modified Reed Straw: Adsorption Performance and Resource Utilization," Sustainability, MDPI, vol. 16(10), pages 1-17, May.

    More about this item

    Keywords

    fluoride; reed; adsorption; desugared;
    All these keywords.

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