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Removal of Fluoride from Geothermal Water by Waste-Synthesized Al(OH)3-HAP@ZMS Composite Adsorbent: Sorption Capability and Mechanism

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Abstract

The use of industrial and biological waste to synthesize adsorbent materials for the treatment of high fluorinated geothermal water is a cost-effective way to address the fluorine pollution problem while also reusing waste resources. In this study, modified hydroxyapatite-loaded zeolite molecular sieve composites (Al(OH)3-HAP@ZMS) were synthesized using fly ash and shell as precursors, which were then cation doped and compound modified to ensure adsorption while remaining cost-effective. When the material ratio of ZMS to Al(OH)3-HAP was 1:6, the best adsorption material was obtained. Under the optimum adsorption conditions (dosage = 6 g/L, T = 50 °C), Al(OH)3-HAP@ZMS achieved a removal rate of 92.5% and an adsorption capacity of 1.56 mg/g for 10 mg/L F solution and can reduce the F concentration to below the national standard concentration of 1 mg/L. The fitting of kinetic, isothermal, and thermodynamic data revealed that F adsorption by Al(OH)3-HAP@ZMS followed the pseudo-second-order kinetics and Freundlich model, confirming that the adsorption process was primarily chemisorption and multilayer adsorption. The adsorption processes included electrostatic attraction, ion exchange between -OH and F, complexation of fluoro-aluminum, and co-precipitation of Ca2+ with F. At the same time, Al(OH)3-HAP@ZMS demonstrated good anti-interference performance in natural waters against co-existing ions and some heat resistance. Therefore, the composite adsorbent Al(OH)3-HAP@ZMS, as an effective and environmentally friendly low-cost adsorbent, is expected to achieve the practical engineering application of geothermal water defluoridation in Guanzhong, maximizing the dual benefits of “fluoride remove” and “waste resource reuse.”

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Funding

This work was supported by the National Natural Science Foundation of China (41302206); Provincial Natural Science Foundation of Shaanxi Province, China (2023-JC-YB-130); and the Fundamental Research Funds for the Central Universities, CHD (300102299205).

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Fei Wang: methodology, formal analysis, investigation, data curation, and writing—original draft preparation and revision. Yuyun Chen: conceptualization, project administration, and funding acquisition. Yanxia Dong: validation and data curation. Hongli Zhang: writing—review and editing. Rongrong Yun: writing—review and editing. Zengyu Liu: writing—review and editing.

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Correspondence to Yuyun Chen.

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Wang, F., Chen, Y., Dong, Y. et al. Removal of Fluoride from Geothermal Water by Waste-Synthesized Al(OH)3-HAP@ZMS Composite Adsorbent: Sorption Capability and Mechanism. Water Air Soil Pollut 234, 411 (2023). https://doi.org/10.1007/s11270-023-06448-9

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  • DOI: https://doi.org/10.1007/s11270-023-06448-9

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