Development of a nanosphere adsorbent for the removal of fluoride from water

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• 作者：Kaisheng Zhang^a ; ^b ; Shibiao Wu^a ; Junyong He^a ; ^b ; Liang Chen^a ; ^b ; Xingguo Cai^a ; ^b ; Kai Chen^a ; ^b ; Yulian Li^a ; ^b ; Bai Sun^a ; Dongyue Lin^a ; Guqing Liu^c ; Lingtao Kong^a ; ^{ltkong@iim.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Jinhuai Liu^a
• 关键词：CeCO3OH nanospheres ; Fluoride ; Adsorption ; Carbonate
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：1 August 2016
• 年：2016
• 卷：475
• 期：Complete
• 页码：17-25
• 全文大小：2783 K

文摘

A new uniform-sized CeCO₃OH nanosphere adsorbent was developed, and tested to establish its efficiency, using kinetic and thermodynamic studies, for fluoride removal. The results demonstrated that the CeCO₃OH nanospheres exhibited much high adsorption capacities for fluoride anions due to electrostatic interactions and exchange of the carbonate and hydroxyl groups on the adsorbent surface with fluoride anions. Adsorption kinetics was fitted well by the pseudo-second-order model as compared to a pseudo-first-order rate expression, and adsorption isotherm data were well described by Langmuir model with max adsorption capacity of 45 mg/g at pH 7.0. Thermodynamic examination demonstrated that fluoride adsorption on the CeCO₃OH nanospheres was reasonably endothermic and spontaneous. Moreover, the CeCO₃OH nanospheres have less influence on adsorption of F⁻ by pH and co-exiting ions, such as SO₄²⁻, Cl⁻, HCO₃⁻, CO₃²⁻, NO₃⁻ and PO₄³⁻, and the adsorption efficiency is very high at the low initial fluoride concentrations in the basis of the equilibrium adsorption capacities. This study indicated that the CeCO₃OH nanospheres could be developed into a very viable technology for highly effective removal of fluoride from drinking water.