Site-Selective Loading of Single-Atom Pt on TiO2 for Photocatalytic Oxidation and Reductive Hydrodefluorination
- Seunghyun WeonSeunghyun WeonDepartment of Chemical and Environmental Engineering and Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), Yale University, New Haven, Connecticut 06511, United StatesSchool of Health and Environmental Science, Korea University, Seoul 02841, Republic of KoreaMore by Seunghyun Weon,
- Min-Jeong SuhMin-Jeong SuhDepartment of Chemical and Environmental Engineering and Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), Yale University, New Haven, Connecticut 06511, United StatesMore by Min-Jeong Suh,
- Chiheng ChuChiheng ChuDepartment of Chemical and Environmental Engineering and Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), Yale University, New Haven, Connecticut 06511, United StatesDepartment of Environmental Science, Zhejiang University, Hangzhou 310058, ChinaMore by Chiheng Chu,
- Dahong Huang ,
- Eli StavitskiEli StavitskiNational Synchrotron Light Source-II, Brookhaven National Laboratory, Upton, New York 11973, United StatesMore by Eli Stavitski, and
- Jae-Hong Kim*Jae-Hong Kim*Phone: +1 (203) 432-4386. E-mail: [email protected]More by Jae-Hong Kim
Separating the redox sites of photocatalysts is one of most promising strategies to promote an efficient photoinduced charge transfer of semiconductor photocatalysis. Herein, we present a site-selective loading of single-atom Pt (Pt1) on facet-engineered TiO2 to achieve decomposition of recalcitrant halogenated water pollutants, including perfluorooctanoic acid (PFOA). Positively charged Pt1 are atomically dispersed catalytic sites that are selectively loaded onto the reductive sites of tailored TiO2 to attract the photoinduced electrons efficiently. This enhances the number of holes, and consequently hydroxyl radicals, remaining on the sites of facet-engineered TiO2, confirmed by the enhancement of degradation of sulfamethoxazole and 2,4-dichlorophenoxyacetic acid. While Pt nanoparticle cocatalysts consume photoinduced electrons for the reduction of oxygen molecules, site-specifically loaded Pt1 produce surface hydrogen atoms and enhance hydrogen spillover onto the TiO2 surface, to achieve efficient hydrodefluorination of PFOA via the cleavage of the C–F bond with the Ti–H bond. The site-selective loading of Pt1 on facet-engineered TiO2 serves as a versatile platform that harnesses both reductive and oxidative degradation of emerging aqueous pollutants.
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