颗粒状碳酸氧镧去除水体中氟的性能

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 La₂O₃materials. 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.