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

采用水热法合成了Ce-La@Fe 3O 4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@Fe 3O 4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@Fe 3O 4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@Fe 3O 4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@Fe 3O 4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。

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.