Preparation of Cu-modified Perovskite LaFeO3 and Its Photocatalytic Antibacterial Properties
Due to the low toxicity,safety,bactericidal broad-spectrum,effective against fungi and bacteria,and environmental friendly,copper has been used as an alternative to silver antibacterial agents.The Cu-modified perovskite LaFeO3(LFO)was prepared by the presubstitution and in-situ exsolution methods,and its crystal structure,light absorption characteristics and morphology were characterized by X-ray diffraction(XRD),UV-Vis diffuse reflection spectroscopy(UV-Vis DRS),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and other characterization methods.The antibacterial properties were evaluated and the possible antibacterial mechanism of photocatalysis was proposed.The addition of molar fraction 0.2%of Cu2+can significantly improve the antibacterial performance of LaFeO3 antibacterial agent against Escherichia coli and Staphylococcus aureus at room temperature,and the antibacterial properties of Cu-modified LFO were further enhanced after Cu2+reduction,and almost all Escherichia coli and Staphylococcus aureus were killed within the specified contact time,and the antibacterial rate was close to 100%,which shows that the Cu-modified perovskite LFO has excellent photocatalytic antibacterial effect.
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