Preparation And Antibacterial Activity Of SnO_2-x/BiOX（X=I,Br） Photocatalytic Material

With the speedy development of science and technology and society,human health has become a serious issue of worldwide concern.Concurring to the World Health Organization（WHO）,80%of human irresistible illnesses are related to organism sullied drinking water.Therefore,effective antimicrobial strategies such as chlorination,ozonation,reactive oxygen species,ultraviolet radiation,and photocatalytic disinfection have become the focus of attention.Photocatalytic sterilization could be a tough and compelling sterilization strategy since photocatalyst has the preferences of attainable blend,moo fetched,great warm solidness,and so on.In this paper,SnO_2-x/BiOBr,SnO_2-x/BiOI,and CQDs/SnO_2-x/BiOI composites were prepared from SnO_2-x,Bismuth oxyhalide（BiOX）,and carbon quantum dots（CQDs）with oxygen vacancies as raw materials.By introducing component vacancies,the recombination rate of electron-hole pairs was reduced and conjointly the photocatalytic bactericide performance was improved.Meanwhie,the morphology,structure,physical phenomenon properties,and medicament properties of the materials were analyzed,and therefore the photocatalytic medicament element was processed by capturing tests.The particular inquire about substance of this paper are as takes after:（1）The SnO_2-x/BiOBr composite photocatalytic material was prepared by hydrothermal method,and then by in situ synthesis at a constant temperature.The morphology and structure of the composite were analyzed by XRD,FT-IR,BET,TEM,HRTEM,and XPS.The results showed that the SnO_2-x/BiOBr composite was successfully prepared.PT and EIS show that SnO_2-x/BiOBr composite has better photoelectric properties.The antibacterial activity against E.coli and S.aureus showed that the SnO_2-x/BiOBr complex could completely kill E.coli and S.aureus within 40minutes and the bactericidal effect was better than that of SnO_2-x and BiOBr.SEM and LSCM results showed that the structure and morphology of E.coli were gradually destroyed during the photocatalytic sterilization process.The results of capture experiments and energy band structure analysis of active species indicated that h⁺played a major role in the antibacterial process,and the system followed a double charge transfer mechanism（2）SnO_2-x/BiOI composite photocatalytic material was prepared by replacing BiOBr with BIOI with better light absorption performance.The composition,morphology,and structure of the composite were characterized by XRD,FT-IR,BET,TEM,HRTEM,and XPS.The results showed that the SnO_2-x/BiOI composite was with success ready.PT and EIS show that the photoelectric properties of SnO_2-x/BiOI composite are good.The antibacterial experiments under LED light showed that the SnO_2-x/BiOI composite could kill E.coli and S.aureus within 40 minutes and its antibacterial activity was better than that of monotonous SnO_2-x and BiOI and was similar to that of SnO_2-x/BiOBr.The LSCM results showed that E.coli was bit by bit destroyed throughout the photocatalytic method.The capture experiment results of active species and energy band structure analysis indicated h⁺contend a serious role within the bactericide method.The system followed a double charge transfer mechanism.（3）based on the above chapter,CQDS with the good conductive property was introduced to further synthesizing CQDs/SnO_2-x/BiOI composite photocatalytic material.The composition,morphology,and structure of the composite were characterized by XRD,Ram,BET,TEM,HRTEM,and XPS.The results showed that the CQDs/SnO_2-x/BiOI composite was successfully prepared.PT and EIS showed that CQDs/SnO_2-x/BiOI composite had better photoelectric properties.The results of antibacterial experiments under LED light showed that CQDs/SnO_2-x/BiOI composite could kill E.coli and S.aureus within 20 minutes and the antibacterial effect was significantly better than that of monotonous SnO_2-x,BiOI,SnO_2-x/BiOBr and SnO_2-x/BiOI.SEM and LSCM results showed that the structure and morphology of E.coli were gradually destroyed as the photocatalytic process proceeded.The photocatalytic antibacterial mechanism of CQDs/SnO_2-x/BiOI was elucidated by the capture experiment of active species and the analysis of energy band structure.h⁺plays a major role in the antibacterial process,and the system follows a double charge transfer mechanism.