Preparation of Ag/AgCl/MIL-100(Fe)/PAN composite and its performance of removing Cr(Ⅵ)in water
Iron-based metal organic framework material[MIL-100(Fe)]was loaded onto polyacrylonitrile(PAN)at room temperature using in-situ growth method,and then Ag/AgCl nanoparticles were deposited on the surface of MIL-100(Fe)/PAN by photo-reduction deposition to obtain Ag/AgCl/MIL-100(Fe)/PAN composites.The crystal structure,morphology and optical absorption performance of the composites were characterized by a series of methods.The effects of initial concentration,initial pH,light and H2O2 on the photocatalytic removal performance of Cr(Ⅵ)by composite materials were explored,and the photocatalytic reaction mechanism was analyzed.The results showed that the introduction of Ag/AgCl could significantly improve the absorption capacity of the composites for visible light.Under the condition of 1000W xenon lamp illumination for 60min,15mg/L Cr(Ⅵ)solution added 0.32mL/L 30%H2O2 and initial pH=3,the removal rate of 6g/L composite for Cr(Ⅵ)reached 93%.After 5 times reuse,the removal rate of composite for Cr(Ⅵ)could still reach 74%.During the photocatalytic process,e-and·O2-played reducing roles.
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