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High-efficiency photocatalyst based on Au nanoparticles loaded on defective ZnO nanorods.
- Source :
-
Vacuum . Jul2024, Vol. 225, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- Optimizing the semiconductor-metal interaction is the key to developing metal single-atom cocatalysts with 100 % metal atom utilization and unique electronic properties. Metal atom sites are exclusively coordinated with semiconductor, featuring a chemical-bond-driven tunable interaction. Here vacancy defect-rich ZnO nanorods (NRs) are fabricated by a facile hydrothermal approach. Au nanoparticles (NPs) are preferentially anchored on surface zinc vacancy sites of ZnO NRs in an ultra-low concentration (10−4 mol/L) of HAuCL 4 solution. The Au/ZnO nanohybrids exhibit an excellent photocatalytic activity toward removal of Rhodamine B and levofloxacin. Combining ferromagnetism and valence-band XPS spectra analysis, it is demonstrated that the strong interaction of surface vacancy defects in ZnO and Au generates a distinct upshift of the valence band edge, resulting from the antibonding interaction between O 2p and Au 5d orbitals which significantly weakens the Au–O bonds. This facilitates the release of the lattice oxygen and thus generates more oxygen vacancies. The remarkable photoactivity of defective Au/ZnO is due to the synergistic interaction between the intrinsic oxygen vacancy and Au. Optimizing the hybridization of transition metal d and O 2p states at the atomic scale can induce more active-sites, improve atomic utilization efficiency and thus provide a new approach for enhancing photoactivity. • ZnO nanorods with vacancy defects were fabricated. • Au nanoparticles were anchored on surface zinc vacancy sites of ZnO nanorods. • Defective Au/ZnO achieved photocatalytic removal of rhodamine B and levofloxacin. • The Au–O antibonding orbital interactions enhance the photocatalytic activity. [ABSTRACT FROM AUTHOR]
- Subjects :
- *GOLD nanoparticles
*NANORODS
*ZINC oxide
*ORBITAL interaction
*RHODAMINE B
Subjects
Details
- Language :
- English
- ISSN :
- 0042207X
- Volume :
- 225
- Database :
- Academic Search Index
- Journal :
- Vacuum
- Publication Type :
- Academic Journal
- Accession number :
- 177372575
- Full Text :
- https://doi.org/10.1016/j.vacuum.2024.113236