Preparation of Fe3O4@SiO2 magnetic adsorbents and their adsorption properties for Er(Ⅲ) and Ho(Ⅲ)
The mining of rare earth resources is accompanied by the emission of rare earth ions,which causes serious pollution to water resources.The adsorption method is an efficient technology to deal with aqueous rare earth ion pollution,and the magnetic adsorbent can quickly realize the solid-liquid separation,which is with high research value.In this study,FeCl3·6H2O,glycol,sodium acetate and polyethylene glycol(PEG2000)were used as raw materials,and Fe3O4 magnetic nanoparticles with a particle size of about 230 nm were prepared by solvothermal method at 200 ℃,and a Fe3O4@SiO2 magnetic adsorbent material with a particle size of about 300 nm was formed by adding Fe3O4 magnetic nanoparticles to ethyl orthosilicate and hydrolyzed and polymerized by ammonia hydrolysis.The prepared composite material is a core-shell structure,including Fe3O4 and SiO2 crystal structures.The coating of SiO2 did not have a great effect on the phase structure of Fe3O4,and Fe3O4 could show certain magnetic properties even when coated.The maximum adsorption capacity of this composite for Er(Ⅲ)and Ho(Ⅲ)was as high as 10.03 mg/g and 5.25 mg/g,respectively.
Fe3O4 magnetic nanoparticlesFe3O4@SiO2core-shell structureEr(Ⅲ)Ho(Ⅲ)
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