Preparation And Performance Of Bismuth Iodide Oxide Composite Photocatalytic Antibacterial Material

With the abuse of antibiotics,more and more bacteria have developed resistance,so,it is urgent to find new antimicrobial agents.Inorganic photocatalytic antibacterial agent has become a research hotspot because of its high activity,good thermal stability,long duration of antibacterial,less toxic side effects and low price.g-C₃N₄/BiOI,GO/g-C₃N₄/BiOI and Cdots/g-C₃N₄/BiOI composites were prepared by combining inorganic photocatalytic material BiOI with organic polymer material g-C₃N₄,conductive material GO and Cdots,respectively.The composition,morphology,structure,photoelectric performance and photocatalytic antibacterial performance were studied systematically,and the antibacterial mechanism was described through capture experiment.The specific research contents of this paper are as follows:?1?First,g-C₃N₄ was prepared by calcination method,and then g-C₃N₄/BiOI composites were prepared by in situ synthesis method.The composition,morphology and structure of the composites were analyzed by XRD,TEM,SEM,XPS and FT-IR;PT and EIS results showed that the e^-and h⁺separation efficiency of g-C₃N₄/BiOI composites was high;The antibacterial properties of E.coli and S.aureus were tested under visible light,the results showed that g-C₃N₄/BiOI composites could kill E.coli and S.aureus completely within 30 min,and its bactericidal effect was significantly higher than that of g-C₃N₄ and BiOI;SEM further confirmed the structure and morphological changes of the bacteria during the killing process;Finally,the mechanism of g-C₃N₄/BiOI composites in the bactericidal process was further revealed through capture experiment.The results showed that·O₂^-,H₂O₂ and h⁺were the active species in the photocatalytic sterilization process,and h⁺played a major role in the system.The antibacterial mechanism of g-C₃N₄/BiOI composites was the double-charge transfer mechanism.?2?First,g-C₃N₄ was prepared by calcination method,and then GO/g-C₃N₄/BiOI composites were prepared by in-situ synthesis method.The composition,morphology and structure of the composites were analyzed by XRD,TEM,SEM,XPS,FT-IR and Raman;PT and EIS results showed that the e^-and h⁺separation efficiency of GO/g-C₃N₄/BiOI composites was high;The antibacterial properties of E.coli and S.aureus were tested under visible light,the results showed that GO/g-C₃N₄/BiOI composites could kill E.coli and S.aureus completely within 30 min,and its bactericidal effect was significantly higher than that of g-C₃N₄,BiOI and g-C₃N₄/BiOI composites;LSCM further verified the photocatalytic antibacterial effect of GO/g-C₃N₄/BiOI composites;Finally,the mechanism of GO/g-C₃N₄/BiOI composites in the bactericidal process was further revealed by capture experiment.The results showed that h⁺was the only active species in the photocatalytic sterilization process and the antibacterial mechanism of GO/g-C₃N₄/BiOI composites was the double-charge transfer mechanism.?3?First,g-C₃N₄ was prepared by calcination method,Cdots was prepared by hydrothermal method,and then Cdots/g-C₃N₄/BiOI composites were prepared by in-situ synthesis method.The composition,morphology and structure of the composites were analyzed by XRD,TEM,SEM,XPS and FT-IR;PT and EIS results showed that the e^-and h⁺separation efficiency of Cdots/g-C₃N₄/BiOI composites was high;The antimicrobial properties of E.coli and S.aureus were tested under visible light,the results showed that Cdots/g-C₃N₄/BiOI composites could kill E.coli and S.aureus completely within 30 min,and the bactericidal effect was significantly higher than that of g-C₃N₄,BiOI,g-C₃N₄/BiOI and GO/g-C₃N₄/BiOI composites;LSCM further verified the photocatalytic antibacterial effect of Cdots/g-C₃N₄/BiOI composites;Finally,capture experiment was used to further reveal the mechanism of Cdots/g-C₃N₄/BiOI composites in the bactericidal process.The results showed that the active species were·OH,·O₂^-,H₂O₂ and h⁺,and h⁺has main antibacterial effect.The antibacterial mechanism of Cdots/g-C₃N₄/BiOI composites was Z-type mechanism.