Issue 2, 2012
From the journal:

RSC Advances

Characteristics of the charge transfer surface complex on titanium(iv) dioxide for the visible light induced chemo-selective oxidation of benzyl alcohol†

Shinya Higashimoto,*a   Kohei Okada,a   Masashi Azuma,a   Hiroyoshi Ohue,a   Tadamasa Teraia  and  Yoshihisa Sakatab  

* Corresponding authors

a College of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka, Japan
E-mail: higashimoto@chem.oit.ac.jp
Fax: +81 6-6957 2135
Tel: +81 6 6954 4283

b Graduate School of Science and Engineering, Yamaguchi University, 2-16-1 Tokiwadai Ube, Japan

Abstract

This paper deals with the oxidation of benzyl alcohol by O2 on pure TiO2 under visible light irradiation, and it was found that the benzyl alcohol is converted into benzaldehyde with high selectivity (>99%). In order to understand the origins of the visible light induced photocatalysis, surface characterizations of the charge transfer complex formed by the interaction of benzyl alcohol with the TiO2 was extensively performed by investigating the effect of heat-treatment on TiO2 or its chemical modification with hydrofluoric acid. Moreover, the study of the kinetic isotope effect (KIE) for the oxidation of benzyl alcohol showed that the α-deprotonation from benzyl alcohol is the rate determining step (RDS), the process of which is assisted by the terminal OH groups of TiO2. Photo-electrochemical investigations were also incorporated to demonstrate the reaction mechanism behind the visible light induced photocatalytic reaction.

Graphical abstract: Characteristics of the charge transfer surface complex on titanium(iv) dioxide for the visible light induced chemo-selective oxidation of benzyl alcohol

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Article information

DOI
https://doi.org/10.1039/C1RA00417D
Article type
Paper
Submitted
07 Jul 2011
Accepted
02 Oct 2011
First published
17 Nov 2011

RSC Adv., 2012,2, 669-676

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Characteristics of the charge transfer surface complex on titanium(IV) dioxide for the visible light induced chemo-selective oxidation of benzyl alcohol

S. Higashimoto, K. Okada, M. Azuma, H. Ohue, T. Terai and Y. Sakata, RSC Adv., 2012, 2, 669 DOI: 10.1039/C1RA00417D

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