Semiconductor / graphene composite photocatalyst can be photocatalyzed for sterilization

Compared with general sterilization methods such as chlorination and ultraviolet light irradiation, semiconductor photocatalytic technology has strong oxidation capability, non-toxic, long-term optical stability, and almost no need for any maintenance. Most semiconductor photocatalysts can be used as bactericidal antimicrobial agents under suitable light irradiation. Graphene and semiconductor combination can further improve bactericidal antimicrobial activity.

Liu et al. with TiO2 nanodella/GO and TiO2 nanowatell/GO photocatalytic inactivation E. coli, SEM photos before and after sunlight are shown in Figure 15. Photocatalytic sterilization involving graphene oxides, E. coli The survival rate reached almost 100 %, Without photocatalytic sterilization involving graphene oxides, the survival rate of E. coli is very low. The possible reason is that the presence of graphene oxides greatly accelerates the separation of TiO2 photocarriers and effectively inhibits their recombination.

Akhavan et al. evaluated the photocatalytic inactivation efficiency of bacteriophage MS2 virus under visible light conditions of WO3/GO composite films by measuring the outflow of RNA from the viral protein layer Messenger and the damage of the protein capsid. The results showed that after lighting 3h at room temperature, Almost all viral proteins were destroyed, and RNA outflow increased rapidly. After each cycle, RNA outflow decreased by less than 10 %, showing good photocatalytic stability.

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