Step-scheme (S-scheme) photocatalysts have been proposed for highly efficient charge separation and strong redox activity in the photocatalysis field. Here, we reported a facile strategy to obtain the S-scheme heterojunction composite TiO 2 / chlorophyll (Chl). The S-scheme heterojunction enables the significant improvement of electron transfer efficiency at the interfacial heterojunction of TiO 2 /Chl. Also, the lifted conduction band and valence band of TiO 2 /Chl resulted in more than 1.61 times generation of reactive oxidizing species, compared to that of bare TiO 2 . In addition, TiO 2 /Chl was applied as a photocatalytic bactericidal material to fabricate commercial masks for prolonged life span of the mask. The TiO 2 /Chl-coated mask filter exhibited excellent bactericidal effect on Escherichia coli under light illumination (2.94 × 10 7 cfu E. coli were killed by 1 cm −2 coated mask filters within illumination of 3 h), while commercial mask filters showed no bactericidal effect. After three circulation-sterilization tests, the TiO 2 /Chl-made mask filter maintained the initial bactericidal effect, which greatly extended the life span of the mask that presents a promising strategy to alleviate the supply stress of masks.

No abstract

The increasing application of carbon dots (CDs) inevitably lead to environmental leakage. To be environmentally friendly, degradable CDs will be the mainstream on agricultural application in the future. Our study...