HUANGYuan-yuan,YANGQing-wei,LEIXiao-ling,et al.Hydroxyapatite Adsorption Treatment of High Fluoride Source Water：Effect, Influencing Factors and Mechanism[J].China Water & Wastewater,2024,40(17):49-56.
Hydroxyapatite Adsorption Treatment of High Fluoride Source Water：Effect, Influencing Factors and Mechanism
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第17期
Page:
49-56
Column:
Date of publication:
2024-09-01
- Keywords:
- （1. College of River and Ocean Engineering; Chongqing Jiaotong University; Chongqing 400074; China; 2. Chongqing Academy of Science and Technology; Chongqing 401123; China）
- Abstract:
- The excessive fluorine content in water has an impact on human health and the ecological environment. To effectively remove fluoride from the water source, the environmentally friendly hydroxyapatite (HAP) was employed as an adsorption material to investigate its efficiency and mechanism in fluoride removal. When the pH was 3, the dosage of HAP was 5.5 g/L, with shaking for 20 minutes and static sedimentation for 10 minutes, the removal rate of fluorine reached the maximum of 94.61%, and the removal efficiency was affected by CO32-, HCO3-, SO42- and Cl-. Additionally, the adsorption performance of the adsorption column packed with granular HAP was superior, yet it was less potent than that of powdered HAP. The adsorption thermodynamics and kinetics revealed that the adsorption of F- by HAP conformed to the Freundlich model and the pseudo-second-order kinetic model, and was classified as an endothermic reaction. The process was dominated by multilayer chemisorption, and the adsorption rate was not merely influenced by intraparticle diffusion. The Zeta potential, FT?IR characterization, and XPS analysis indicated that electrostatic interaction and ion exchange between hydroxyl and fluoride ions constituted the main mechanisms of fluoride ions adsorption by HAP.
Last Update:
2024-09-01