Fe3O4@SiO2@IL was prepared by immobilizing imidazole based ionic liquids on the surface of magnetic nanoparticles with impregnation method,and was then used to remove Hg2+in the water.The effects of pH value,adsorption time,and adsorbent dosage on the Hg2+removal rate were investigated.The results show that Fe3O4@SiO2@IL can have a wide application,and Hg2+removal rate can exceed 99.1％with pH of 7.2-9.5.Fe3O4@SiO2@IL presents a high rate of Hg2+adsorption,and the adsorption can reach equilibrium within 90 minutes.For 25 mL Hg2+solution with a concentration of 2 μg/mL,Hg2+can be completely removed by adding 20 mg of adsorbent.The adsorption isotherms of Fe3O4@SiO2@IL indicate that the saturated adsorption capacity of the adsorbent for Hg2+is 548.37 mg/g.
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