Study on Preparation and Properties of Aluminum-based Lithium Adsorbents Doped with Magnetic Particles Fe3O4@SiO2
A layered magnetic aluminum-based adsorbents(MLDHs)were prepared by combining Fe3O4@SiO2 magnetic particles and aluminum-based adsorbents.The structure and morphology of MLDHs were characterized by XRD and SEM.The adsorption performance of MLDHs for lithium ions in solution was investigated,and the adsorption isotherm,adsorption kinetics and cycle stability of the adsorption process were studied.The results showed that MLDHs were suitable for lithium adsorption in the pH range of 3-5,and their adsorption capacity can reach up to 12.42 mg/g.In mixed-ion solutions,MLDHs exhibited good selectivity and preferential adsorption for lithium ions.After five adsorption-desorption cycles,the adsorption capacity of MLDHs did not change significantly.The adsorption isotherms and adsorption kinetics fit the Langmuir model and the pseudo-second-order kinetic model,respectively.
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