Issue 2, 2019

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

Abstract

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
30 oct. 2018
Accepted
07 déc. 2018
First published
07 déc. 2018

Sustainable Energy Fuels, 2019,3, 488-498

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

J. Shi, H. Hao and X. Lang, Sustainable Energy Fuels, 2019, 3, 488 DOI: 10.1039/C8SE00527C

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