Phenol-TiO2 complex photocatalysis: visible light-driven selective oxidation of amines into imines in air

作者：Shi, Ji-Long; Hao, Huimin; Lang, Xianjun^*

来源：Sustainable Energy and Fuels, 2019, 3(2): 488-498.

DOI：10.1039/c8se00527c

• SINGLE-ATOM CATALYST
• DYE-SENSITIZED TIO2
• AEROBIC OXIDATION
• ELECTRON-TRANSFER
• CARBON
• DEGRADATION
• TITANIA
• ACID

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 O-2 under blue light-emitting diode (LED) irradiation. In addition, a mechanism is proposed to explain the visible-light photocatalytic performance of the present system.

• 出版日期2019-2-1
• 单位武汉大学; 南开大学