Phenol–TiO2 complex photocatalysis: visible light-driven selective oxidation of amines into imines in air
| Autor: | Huimin Hao, Ji-Long Shi, Xianjun Lang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Renewable Energy
Sustainability and the Environment Chemistry Energy Engineering and Power Technology 02 engineering and technology Surface complexation 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Fuel Technology Photocatalysis Phenol Irradiation 0210 nano-technology Visible spectrum |
| Zdroj: | Sustainable Energy & Fuels. 3:488-498 |
| ISSN: | 2398-4902 |
| DOI: | 10.1039/c8se00527c |
| Popis: | Strong interfacial charge-transfer (ICT) has been observed between phenol and TiO2. It was demonstrated that a single Ph–O–Ti linkage could induce ICT transitions in the visible light region. By utilizing the surface complexation of phenol with TiO2, we, herein, present a new photocatalytic protocol for the selective oxidation of amines to imines in air. Our success depended on merging the phenol–TiO2 complex photocatalyst with (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO), so called cooperative photocatalysis, which improved stability of the surface-complexed phenol under the oxidative circumstance and promoted the selective conversion of amines. With 5 mol% of TEMPO as a co-catalyst and phenol–TiO2 complex (containing 0.8 mol% of phenol) as a photocatalyst, amines could be efficiently oxidized into imines with atmospheric O2 under blue light-emitting diode (LED) irradiation. In addition, a mechanism is proposed to explain the visible-light photocatalytic performance of the present system. |
| Databáze: | OpenAIRE |
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