人工晶体学报, 2020, 49 (9): 1705, 网络出版: 2020-11-11
Ce-La@Fe3O4吸附剂制备及其除氟性能研究
Fabrication of Ce-La@Fe3O4 Adsorbents and Its Property for Defluorination
吸附剂 水热法 除氟 动力学 热力学 adsorbent Ce-La@Fe3O4 Ce-La@Fe3O4 hydrothermal method defluorination dynamic thermodynamic
摘要
采用水热法合成了Ce-La@Fe3O4复合吸附剂,并将其应用于水溶液中氟离子的去除研究。扫描电镜发现Ce-La@Fe3O4吸附剂呈方块状颗粒,大小为(1.22±0.35) μm,吸附氟离子后颗粒出现了一定程度黏连。Ce-La@Fe3O4吸附剂对氟离子的吸附动力学遵循拟二级动力学反应模型,整个吸附反应为多级控制过程; 相比于Freundlich 模型,Ce-La@Fe3O4吸附剂对氟离子的吸附更加符合Langmuir模型,该吸附过程为放热反应,温度越高越有利于吸附容量提高。吸附剂Ce-La@Fe3O4具有磁性,吸附氟离子后,易于采用普通磁铁将其吸附回收重复使用。
Abstract
Ce-La@Fe3O4 composite adsorbents were fabricated by hydrothermal method and it was used to remove fluoride from aqueous solution. SEM images show that Ce-La@Fe3O4 adsorbents are square particle with diameter of (1.22±0.35) μm, and a certain extent adhesion are observed after the adsorption fluoride. The pseudo-second-order has been found suitable for describing the kinetics process of the fluoride absorption on Ce-La@Fe3O4 adsorbents while the net rate can thus be sequentially controlled in a multi-stage condition. The fitness of adsorption data by Langmuir model is superior to Freundlich model.The fluoride adsorption capacity would increase obviously when the reactive temperature rises. Ce-La@Fe3O4 adsorbents are magnetic, and are easy to be recovered and reused by ordinary magnets after adsorption fluoride.
赵瑨云, 苏丽鳗, 徐婕, 刘俊劭, 穆寄林, 胡家朋, 林皓, 付兴平, 刘瑞来. Ce-La@Fe3O4吸附剂制备及其除氟性能研究[J]. 人工晶体学报, 2020, 49(9): 1705. ZHAO Jinyun, SU Liman, XU Jie, LIU Junshao, MU Jilin, HU Jiapeng, LIN Hao, FU Xingping, LIU Ruilai. Fabrication of Ce-La@Fe3O4 Adsorbents and Its Property for Defluorination[J]. Journal of Synthetic Crystals, 2020, 49(9): 1705.