Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 33, Pages 39446-39457Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c10892
Keywords
charge transfer; S-scheme heterojunction; reactive oxidizing species; photocatalytic sterilization; mask filter
Funding
- National Natural Science Foundation of China [21671070]
- Project of GDUPS
- Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams [2020KJ122]
- Special Scientific Research Project of Guangdong Universities [2020KZDZX1035]
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The study introduced a strategy to prepare S-scheme photocatalyst TiO2/chlorophyll, which significantly improved electron transfer efficiency. Under light illumination, TiO2/chlorophyll showed excellent bactericidal effect and extended the lifespan of masks.
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 TiO2/chlorophyll (Chl). The S-scheme heterojunction enables the significant improvement of electron transfer efficiency at the interfacial heterojunction of TiO2/Chl. Also, the lifted conduction band and valence band of TiO2/Chl resulted in more than 1.61 times generation of reactive oxidizing species, compared to that of bare TiO2. In addition, TiO2/Chl was applied as a photocatalytic bactericidal material to fabricate commercial masks for prolonged life span of the mask. The TiO2/Chl-coated mask filter exhibited excellent bactericidal effect on Escherichia coli under light illumination (2.94 x 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 TiO2/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.
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