Preparation And Photocatalytic Performance Of Magnetic Bismuth Oxyhalide Composite

The development of modern industrial technology is becoming more and more rapid,the environment is seriously polluted,and the high attention of the people around the world is caused.It is urgent to find a green and efficient way to solve the current environmental problems.In recent years,the semiconductor photocatalysis material has attracted wide attention in the field of environmental pollution control.Among them,bismuth halide oxide?BiOX,X=Cl,Br,I?is the hot spot of the research at home and abroad with its unique layered structure,stable performance,indirect transition mode and low toxicity.However,there are some defects in the halide oxidation process,such as low visible light utilization rate,easy recombination of photo-generated carriers,low cycle utilization rate and difficult recovery.Therefore,the photocatalytic performance of bismuth halide needs to be improved by some modification methods.In order to overcome the shortcomings of BiOX photocatalyst,the BiOX photocatalyst with excellent photocatalytic activity was prepared by using rare earth doping and loading methods,which realized the efficient degradation of organic pollutants in water and expanded the application of BiOX photocatalyst in the field of environmental pollution control.The main research contents of this paper include the following three parts:?1?Flake structure Fe₃O₄/Pr-BiOCl photocatalyst was synthesized by combustion method.Because rare earth ion Pr can capture the electrons produced by photocatalyst,the photocatalytic activity of the photocatalyst was enhanced by reducing the recombination rate of photogenerated electrons and holes.Then Fe₃O₄/Pr-BiOCl was loaded onto the natural bio-material luffa by 1-allyl-3-methylimidazole chloride ionic liquids,and the high specific area of luffa was used to increase the adsorption capacity of the photocatalyst.Fe₃O₄/Pr-BiOCl/Luffa photocatalyst was obtained.The goal of degradation of rhodamine B under visible light was achieved.?2?Disk-like Sc-BiOBr photocatalysts were prepared by solvothermal method.And then the prepared Sc-BiOBr photocatalyst was loaded on the natural biological material palm bark with the aid of 1-methyl-detomidine chloride ion liquid to obtain the Sc-BiOBr/palm bark photocatalyst.Under the dual action of rare earth ion Sc and natural biomaterial palm bark,the photocatalytic activity of photocatalyst was improved,and the efficient degradation of estradiol under visible light was achieved.?3?Nd-BiOI photocatalysts with three-dimensional globular structure were synthesized by hydrothermal method.Then the Nd-BiOI photocatalyst was loaded on the natural biological material luffa by using 1-methyl-imidazole chloride ionic liquids as solvant,and the Nd-BiOI/luffa photocatalyst was obtained.The photocatalytic activity was enhanced by the capture of electrons by rare earth ion Nd and the increase of specific surface area by luffa complexes.Thus,the degradation of organic pollutant malachite green in water under visible light was realized.