WANGAi-he,CHINian-ping,SHENGJian-wu,et al.Defluoridation Capability of Granular Ca-Fe-La Ternary Metal Oxide Composites[J].China Water & Wastewater,2025,41(23):118-123.
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Defluoridation Capability of Granular Ca-Fe-La Ternary Metal Oxide Composites

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第41卷 Number: 第23期 Page: 118-123 Column: Date of publication: 2025-12-01
Author(s):
WANG　Ai-he1; 2;  CHI　Nian-ping1; 2;  SHENG　Jian-wu1; 2;  ZHANG　Wei1; 2;  SHU　Jin-kai2;  WANG　Cun-pei2;  LIAO　Zi-yuan2
（1. Hunan Provincial Village Drinking Water Quality Safety Engineering Technology Research Center， Yiyang 413000， China； 2. School of Municipal and Mapping Engineering， Hunan City University， Yiyang 413000， China）
Keywords:
ternary metal oxide composite;  fluoride ion;  adsorption;  removal mechanism
Abstract:
A granular fluoride removal material (PVA-SA-CCFL) was synthesized by immobilizing powder Ca-Fe-La ternary metal oxide composites using polyvinyl alcohol and sodium alginate as embedding agents, so as to address the challenge of poor separation associated with powdered ternary metal oxides in the treatment of fluoride-containing wastewater. The adsorption performance of the PVA-SA-CCFL toward fluoride ions was systematically evaluated using simulated wastewater. The morphological and structural characteristics of the adsorbent before and after adsorption were comprehensively analyzed using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X?ray photoelectron spectroscopy (XPS), based on which the potential adsorption mechanism was proposed and discussed. The initial pH of the solution exerted a relatively minor influence on the defluoridation performance of PVA-SA-CCFL, which maintained a high adsorption efficiency across a pH range of 2 to 8. The presence of coexisting anions, particularly PO43-, SO42-, and NO3-, significantly affected the material’s fluoride removal efficiency, whereas HCO3- and CO32- exhibited a comparatively minor influence. The experimental data exhibited a high degree of consistency with the results derived from the pseudo-second-order kinetic model, the Langmuir and the Freundlich adsorption isotherm models. Temperature elevation promoted the adsorption process. At 323 K, the maximum theoretical adsorption capacity of PVA-SA-CCFL reached 46.66 mg/g. Fluoride ions were primarily removed via electrostatic interactions and hydroxyl group exchange. After four cycles of regeneration, PAV-SA-CCFL maintained a fluoride adsorption efficiency of 78.16%.
Last Update: 2025-12-01