Chinese Journal of Applied Chemistry ›› 2024, Vol. 41 ›› Issue (2): 297-307.DOI: 10.19894/j.issn.1000-0518.230319

• Full Papers • Previous Articles    

Performance of Granular Lanthanum Oxycarbonate in Removing Fluorine from Water

Tao ZHANG1, Si-Ying LI1, Jun-Le LI1, Si-Yu SHAO1, Chuan-Dong WU2,3, Mei LING1, Dong-Wei LYU1, Wei WANG2()   

  1. 1.School of Environment,Harbin Institute of Technology,Harbin 150090,China
    2.Harbin Institute of Technology National Engineering Research Center of Urban Water Resources Co. ,Ltd. ,Harbin 150090,China
    3.Guangdong Yuehai Water Investment Co. ,Ltd. ,Shenzhen 518021,China
  • Received:2023-10-13 Accepted:2024-01-18 Published:2024-02-01 Online:2024-03-05
  • Contact: Wei WANG
  • About author:wangweirs@hit.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(51678181)

Abstract:

To address the issue of low adsorption capacity for fluoride ions in traditional adsorbents, granular lanthanum oxycarbonate (La2O2CO3) materials are prepared by activating lanthanum oxide (La2O3). La2O2CO3 exhibits strong adsorption performance for fluoride ions and effectively removes fluoride over a wide pH range of 3.0 to 10.0, achieving a fluoride ion removal rate of 94.5% to 98.0%. The adsorption behavior of La2O2CO3 for fluoride ions follows the Langmuir model and is characterized as an endothermic process. At 25 ℃, it reaches a saturated adsorption capacity of 22.47 mg/g, which is approximately five times higher than that of traditional La2O3 materials. The adsorption kinetics adhere to a pseudo-second-order kinetic model, primarily involving chemical adsorption. La2O2CO3 can be regenerated using a sodium hydroxide solution, with a desorption rate of 90.3% achieved at a sodium hydroxide concentration of 1.0 mol/L, enabling the reuse of the adsorbent.

Key words: Lanthanum oxycarbonate, Adsorbent, Defluorination in water, Thermodynamics, Kinetics, Regeneration

CLC Number: