Poly(4-vinylphenol) as a new stable and metal-free sensitizer of titania for visible light photocatalysis through ligand-to-metal charge transfer process
| Autor: | Wonyong Choi, Chuhyung Kim, Guan Zhang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Catalysis 0104 chemical sciences Metal Electron transfer chemistry visual_art Poly-4-vinylphenol visual_art.visual_art_medium Photocatalysis 0210 nano-technology Platinum HOMO/LUMO Visible spectrum |
| Zdroj: | Catalysis Today. 281:109-116 |
| ISSN: | 0920-5861 |
| DOI: | 10.1016/j.cattod.2016.06.048 |
| Popis: | In this study, poly (4-vinylphenol) (denoted as PVP) was firstly used as a stable and low-cost sensitizer of titania for visible light photocatalysis. The PVP thin-layer was readily grafted on TiO 2 (PVP/TiO 2 ) through surface complexation between the multiple hydroxyl groups of PVP and the surface titanol groups (Ti-OH), via simple dispersion of PVP and TiO 2 powders in organic solvent. We have demonstrated that the PVP layer sensitizes TiO 2 under visible light through the ligand-to-metal charge transfer (LMCT) mechanism. The PVP/TiO 2 (with platinum as co-catalyst) composite exhibited a visible light activity of H 2 production in the presence of suitable electron donors, whereas phenol-complexed TiO 2 (compared as a control) did not generate H 2 in the identical condition. Furthermore, PVP/TiO 2 exhibited efficient photocatalytic degradation of organic pollutant (4-cholorophenol) under visible light irradiation. In addition, the photoelectrochemical measurements for PVP/TiO 2 -coated electrodes (PVP/TiO 2 /FTO) supported the visible light-induced LMCT process on PVP/TiO 2 , which involves the direct electron transfer from the highest occupied molecular orbital (HOMO) of PVP to the conduction band of TiO 2 as the origin of the visible light photocatalytic activity. |
| Databáze: | OpenAIRE |
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