Abstract
Bacteria are mostly everywhere, some of them affect health safety of human beings, plants and animals all the time. Photocatalytic antibacterial technology has entered people's field of vision due to their high-efficiency and sustainability. In this study, LaCoO3 precursors were prepared by solvothermal synthesis, and then calcined to obtain self-assembled LaCoO3 microspheres. Subsequently, LaCoO3/Ag3PO4 microspheres were synthesized by in-situ precipitation method. Compared with pure LaCoO3 microspheres, the introduction of Ag3PO4 nanoparticles can effectively enhance the antibacterial performance of LaCoO3/Ag3PO4 nanocomposites. LaCoO3/Ag3PO4 nanocomposites' Minimum Inhibitory Concentrations (MICs) against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) were tested to be 0.1 mg mL−1 and 0.15 mg mL−1, respectively. Under visible light irradiation for 20 min, the antibacterial rate of nanocomposites against E. coli and S. aureus was 99.9 % and 98.3 %, correspondingly. This can be attributed to the fact that LaCoO3/Ag3PO4 heterojunction significantly improves the responsiveness of visible light, carrier separation and migration efficiency of LaCoO3, which promotes the nanocomposite to produce a large number of ROS under visible light. In addition, LaCoO3/Ag3PO4 nanocomposites had a strong oxidation effect on glutathione (GSH), resulting in the failure of the antioxidant defense system of bacteria. Also, the release of Ag+ and plasma effect of Ag are also important reasons for the high antibacterial performance of LaCoO3/Ag3PO4 nanocomposites. The photoresponse of LaCoO3-based nanomaterials under visible light is effectively improved by constructing heterojunctions, the separation efficiency of photogenerated electron-hole pairs is increased, and the carrier transport is accelerated, thus achieving high efficiency and broad spectrum antibacterial effect. This research shows that LaCoO3 nanocomposites can be used as a prospective photocatalytic antibacterial material, enhances the value of practical applications.
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