Probing paramagnetic species in titania-based heterogeneous photocatalysis by electron spin resonance (ESR) spectroscopy—A mini review

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2011-06, Vol.170 (2), p.353-362
• Main Authors: Wang, Zhaohui, Ma, Wanhong, Chen, Chuncheng, Ji, Hongwei, Zhao, Jincai
• Format: Article
• Language: English
• Subjects: Chemical engineering; Electron paramagnetic resonance; electron paramagnetic resonance spectroscopy; Electron spin resonance; Electron spin resonance (ESR); Monitoring; N doped-TiO 2; Organoperoxy radical; Photocatalysis; photolysis; Radicals; reactive oxygen species; Spectra; Spin trap; Titanium dioxide
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2010.12.002

Many paramagnetic species such as active surface sites, reactive oxygen species (ROS) and organic radicals derived from the photodegradation of organics were involved in the heterogeneous photocatalysis. Identification and characterization of these paramagnetic species are essentially conducted using electron spin resonance (ESR) techniques, which can provide a detailed understanding of the radical composition and structure on the basis of the unique feature of g, hyperfine, and superhyperfine tensors for each kind of radicals of interest. In the present review, the basic theoretical principles of the ESR technique and its application in the field of TiO 2-based heterogeneous photocatalysis are generally summarized. Two experimental approaches typical of ESR-direct monitoring of paramagnetic species or sites and spin-trapping technique have been described with particular attention to the choices of spin traps. The general features of the ESR spectra of photoinduced charges, inorganic and organic radicals in photocatalytic events are presented and discussed. In addition, some remarks will be made about the use of ESR in revealing the origin of enhanced photocatalytic activities in the mixed phase titania (P25) and visible-light-response N-doped TiO 2.