In order to improve the photogenerated electron-hole separation and recycling ability of single semicon-ductor powder material,based on the functionally synergistic effect,magnetic graphene aerogel(Fe3O4-BiOBr/graphene)modified by Fe3O4-BiOBr had been facilely prepared by one-step hydrothermal process by dispersing Fe3O4-BiOBr composite in aqueous solution of graphene oxide containing lysine.The Fe3O4-BiOBr composite was synthesized in non-miscible solvent system under room-temperature,in which nano Fe3O4,firstly prepared by co-precipitation method using Fe3+/Fe2+ salt under the action of ammonia water with a certain concentration,was dispersed in n-octane containing hexadecyl trimethyl ammonium bromide(CTAB)for providing Br-,interacting with an aqueous solution containing bismuth nitrate and citric acid adding drop by drop.The crystal structure,morphology and catalytic activity of the samples were characterized by XRD,Raman,XPS,SEM,TEM,and UV-Vis spectra.Fe3O4-BiOBr/graphene composites,in which spherical Fe3O4 with a size of 10-25 nm are evenly embedded in layered BiOBr flakes,and they interact with graphene,overall,have showed a sphere-sheet-cavity structure.Fe3O4-BiOBr/graphene composites have favorable visible light absorption efficiency and Cr(VI)photocatalytic activity.The photocatalytic activity of Cr(VI)could achieve about 100%within 30 min,which is higher than that of single magnetic Fe3O4.This phenomenon maybe origin from the introduction of Fe3O4-BiOBr heterostructure and conductive graphene as well as their good interfacial interaction within them,effectively promoting the separation efficiency of photogenerated electrons and holes between Fe3O4-BiOBr/graphene composite.
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