Outstanding fluoride removal from aqueous solution by a La-based adsorbent

Weisen Yang; Fengshuo Shi; Wenlong Jiang; Yuhuang Chen; Kaiyin Zhang; Shaoju Jian; Shaohua Jiang; Chunmei Zhang; Jiapeng Hu

doi:10.1039/D2RA06284D

Outstanding fluoride removal from aqueous solution by a La-based adsorbent†

Weisen Yang,^a Fengshuo Shi,^a Wenlong Jiang,^a Yuhuang Chen,^a Kaiyin Zhang,^c Shaoju Jian,

*^a Shaohua Jiang,

^ab Chunmei Zhang*^d and Jiapeng Hu*^a

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* Corresponding authors

^a Fujian Key Laboratory of Eco-Industrial Green Technology, College of Ecology and Resources Engineering, Wuyi University, Wuyishan 354300, China
E-mail: jianshaoju@126.com, wyuwqhjp@163.com

^b Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China

^c College of Mechanical and Electrical Engineering, Wuyi University, Wuyishan 354300, China

^d Institute of Materials Science and Devices, School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
E-mail: cmzhang@usts.edu.cn

Abstract

A La-based adsorbent was prepared with La(NO₃)₃·6H₂O, 2-methylimidazole and DMF via amide-hydrolysis and used for fluoride decontamination from aqueous water. The obtained adsorbent was lanthanum methanoate (La(COOH)₃). The effects of pH value, initial F⁻ concentration and interfering ions on defluoridation properties of as-prepared La(COOH)₃ were assessed through batch adsorption tests. The adsorption kinetics, isotherm models and thermodynamics were employed to verify the order, nature and feasibility of La(COOH)₃ towards fluoride removal. The results imply that La(COOH)₃ is preferable for defluoridation over a wide pH range of 2 to 9 without interference. Simultaneously, the defluoridation process of La(HCOO)₃ accords to the pseudo-second order model and Langmuir isotherm, revealing chemical adsorption is the main control step. The maximum fluoride capture capacities of La(COOH)₃ at 30, 40 and 50 °C are 245.02, 260.40 and 268.99 mg g⁻¹, respectively. The mechanism for defluoridation by La(COOH)₃ was revealed by PXRD and XPS. To summarize, the as-synthesized La based adsorbent could serve as a promising adsorbent for defluoridation from complex fluoride-rich water.

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Outstanding fluoride removal from aqueous solution by a La-based adsorbent†

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Outstanding fluoride removal from aqueous solution by a La-based adsorbent

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