A novel magnetic chromium(Ⅵ) ion-imprinted polymer [Cr(Ⅵ)-IIPs] was prepared by the surface imprinting technique with Fe3O4@mSiO2 as magnetic carrier,Cr2O2-7 as template ion,salicylaldehyde oxime as functional monomer,α-methacrylic acid as comonomer and ethylene glycol dimethacrylate (EGDMA) as crosslinking agent.The polymer was characterized by fourier transform infrared spectroscopy(FT-IR),transmission electron microscopy(TEM),thermogravimetric analysis (TGA) and zeta potential characterization.The adsorption properties of the polymer were investigated by designing single factor adsorption experiments.The results showed that at room temperature,when the pH of the solution was 2,the imprinted polymer could reach the adsorption equilibrium in 2 h,and the maximum adsorption capacity was 145mg/g.The relative selectivity coefficients of Cr(Ⅵ)-IIPs for CrO2-4,Cr3+,Pb2+ and Cu2+ were 6.32,4.21,3.00 and 3.30,respectively,indicating that Cr(Ⅵ)-IIPs had strong selective ability for target ions.After being reused for 6 times,there were no obvious changes in adsorption capacity of the polymer.
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基金资助
国家重点研发计划项目(2018YFC1603200/2018YFC1603202)
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