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Langmuir

Title:		DRIFTS evidence for facet-dependent adsorption of gaseous toluene on TiO2 with relative photocatalytic properties
Author(s):		Wang M; Zhang F; Zhu X; Qi Z; Hong B; Ding J; Bao J; Sun S; Gao C;
Address:		"CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science & Technology of China , Hefei, Anhui 230026, China"
Journal Title:		Langmuir
Year:		2015
Volume:		20150128
Issue:		5
Page Number:		1730 - 1736
DOI:		10.1021/la5047595
ISSN/ISBN:		1520-5827 (Electronic) 0743-7463 (Linking)
Abstract:		"Effective adsorption is of great importance to the photocatalytic degradation of volatile organic compounds. Herein, we succeeded in the preparation of anatase TiO2 with clean dominant 001 and 101 facets. By using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) equipped with a homemade reaction system and a coupling gas-dosing system, we found that TiO2 with dominant 001 facets exhibits higher toluene adsorption capacity than TiO2 with dominant 101 facets, which may be attributed to the different number of unsaturated 5c-Ti capable of forming the main active adsorption sites (terminal Ti-OH species). TiO2 with dominant 001 facets shows a significantly high photocatalytic degradation performance, with its degradation rate being 6 times higher than that of dominant 101 facets. Combined with simulation results, it is suggested that the synergetic effects of the formation of specific active adsorption sites, the low adsorption energy for toluene, and preservation of the free molecularly adsorbed water on the surface promote the degradation of gaseous toluene on the dominant 001 facets. This study exemplifies that the facet-dependent adsorption of volatile organic compounds is one of the most important factors to effectively engineer photocatalysts for air purification"
Keywords:
Notes:		"PubMed-not-MEDLINEWang, Mengjiao Zhang, Fan Zhu, Xiaodi Qi, Zeming Hong, Bin Ding, Jianjun Bao, Jun Sun, Song Gao, Chen eng 2015/01/21 Langmuir. 2015 Feb 10; 31(5):1730-6. doi: 10.1021/la5047595. Epub 2015 Jan 28"