La@SiO_(2)负载天然沸石对F^(-)的吸附研究

Adsorption of F^(-) with La@SiO_(2)-loaded Natural Zeolites

以天然沸石为载体,制备了La@SiO_(2)负载天然沸石材料La@Si-NZ,并用于水中氟离子(F^(-))的吸附,对材料的吸附动力学、等温吸附性能、再生能力和吸附机理进行了探究。结果表明,La@Si-NZ对F-的吸附,符合拟二级动力学模型和Langmuir模型,在298K下,理论最大吸附量为14.2 mg·g^(-1)。动态吸附中,经过5次循环再生后,La@Si-NZ对F-的吸附量降低了10%。

Applied natural zeolite as a carrier,La@SiO_(2)-loaded(La@Si-NZ)was prepared and used for the adsorption of fluoride ions(F^(-))in water,and its adsorption kinetics,isothermal adsorption performance,regeneration capacity and adsorption mechanism were investigated.The results showed that the adsorption of La@Si-NZ on F-was in accordance with the proposed secondary kinetic model and Langmuir model,and the theoretical maximum adsorption capacity was 15.4 mg/g at 298K.The adsorption capacity of La@Si-NZ on F-decreased by 10%after five cycles of regeneration in dynamic adsorption.