BiOX(X=Cl,Br)-based Nanomaterials:Preparation And Visible-light-driven Photocatalytic Property

In the decades,the environmental pollution is worsening,especially the water pollution and drug-resistant bacteria pollution caused by the abuse of antibiotics.Semiconductor photocatalytic nanomaterials have become the focus of recent research on polluted water treatment,because it is a green and efficient technology,compared to conventional techniques.As a new type of semiconductor photocatalyst,Bismuth oxyhalides BiOX(X=C1,Br)has been paid a great deal of attention for its superior photocatalytic performance in contaminant decomposition,the excellent photocatalytic performance is due to its peculiar layer structure characterized by[Bi2O2]slabs interleaved by double slabs of iodine atoms and indirect transition band-gap semiconductor feature.BiOBr has suitable band gap and response to UV-visible light,fast recombination of photogenerated electron-hole pairs limit the further improvement of its photocatalytic activity.Whereas,the shortcomings of wide-bandgap BiOCl is low visible light utilization efficiency and limit the use of the solar energy.Based on these problems,we adopt a simple and feasible chemical method to prepare visible-light-driven BiOX(X=Cl,Br)-based nanomaterials.As to the different solubility product of BiOBr and BiOCl,Bi is in-situ reduced from the BiOBr and oxygen vacancies is introduced in BiOCl,attributting to the reducibility of DEG.The main contents were discussed as follows.1.Bi/BiOBr flower-like nanomaterial has been prepared via a facile hydrothermal reaction with a high visible-light photocatalytic activity.The in situ formed Bi nanoparticles is attributed to the reducibility of DEG.Because of the surface plasma resonance of the in situ Bi nanoparticle,Bi/BiOBr has a highly increased absorption about the UV and visible light.Bi/BiOBr exhibit high visible-light-driven photocatalytic property for the degradation of antibiotics include tetracycline hydrochloride and sulfisoxazole.In the visible light 92%tetracycline hydrochloride was degradated just after 2min.The flower-like nanostructures also have been proved to work as effective photocatalysts because of the excellent photocatalytic activity towards the degradation of single and mixed dyes under visible light irradiation.And the photocatalyst is sufficiently stable after five recycling runs in the photodegradation of organic dye.The photo-induced hole h+are suggested to play a critical role in the photocatalytic degradation over the Bi/BiOBr.2.Oxygen deficient BiO1-xCl flower-like nanomaterial with high visible-light photocatalytic activity has been prepared via a facile hydrothermal reaction.The oxygen vacancies is introduced,attributting to the reducibility of DEG.Because of the introducing oxygen vacancies,oxygen deficient BiO1-xCl shows a deeper gray color and has a highly increased absorption about the UV and visible light,and its band gap narrows.The flower-like nanostructures oxygen deficient BiO1-xC has been proved to work as effective photocatalysts because of the excellent photocatalytic activity towards the degradation of single and mixed dyes under visible light irradiation.92%dye RhB was degradated just after 3min visible light irradation.Oxygen deficient BiO1-xCl also exhibits high visible-light-driven photocatalytic property for the degradation of antibiotic tetracycline hydrochloride.And the oxygen deficient BiO1-xCl photocatalyst shows good antibacterial activities against staphylococcus aureus.The photo-induced hole h+are suggested to play a critical role in the photocatalytic degradation over the oxygen deficient BiO1-xCl.3.As to improve the antibacterial activities of the oxygen deficient BiO1-xCl photocatalyst,we synthesize Ag/BiOCl flower-like nanomaterial loaded with different wt%Ag nanoparticles with a facile hydrothermal reaction.The loading of Ag nanoparticles on BiOCl significantly enhanced absorption about the visible light and the.photocatalytic antibacterial activities of BiOCl because of the SPR effect of nanosized Ag.And the increasing of wt%Ag nanoparticles makes the better photocatalytic antibacterial activities Ag/BiOCl flower-like nanomaterial.