Microemulsion–Assisted Synthesis of Ag2CrO4@MIL–125(Ti)–NH2 Z–Scheme Heterojunction for Visible–Light Photocatalytic Inactivation of Bacteria

Metal–organic frameworks (MOFs) are new porous materials composed of metal centers and organic ligand bridges, which received great attention in the field photocatalysis. In this work, Ag2CrO4@MIL–125(Ti)–NH2 (denoted as AgCr@M125) Z–scheme heterojunctions were synthesized via a simple microemulsion method, by highly dispersed nano–sized Ag2CrO4 can be anchored uniformly on surfaces MIL–125(Ti)–NH2 M125). Compared with pure M125 Ag2CrO4, as–prepared AgCr@M125 hybrids show significant photocatalytic efficiency against inactivated Staphylococcus aureus (S. aureus), reaching over 97% inactivation bacteria after 15 min visible light irradiation. Notably, activity obtained 20%AgCr@M125 is about 1.75 times higher than that AgCr–M125, was prepared traditional precipitation method. The enhanced antibacterial system strongly ascribed to direct mechanism, carefully discussed based energy band positions time–dependent electron spin response (ESR) experiments. Our work highlights way enhance effect coupling microemulsion–assisted strategy affords an ideal example for developing MOFs–based photocatalysts excellent photoactivity.