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Acta Physico-Chimica Sinica  2011, Vol. 27 Issue (07): 1751-1756    DOI: 10.3866/PKU.WHXB20110701
CATALYSIS AND SURFACE SCIENCE     
Effects of Surface Areas and Adsorption Strength on the Photoactivity and Decomposition Kinetics of Acid Red 27 over TiO2-Coated/Activated Carbon Composites
LI You-Ji, CHEN Wei, LI Lei-Yong
College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, Hunan Province, P. R. China
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Abstract  

TiO2-coated/activated carbon composites (TCS) were prepared by supercritical pretreatment and sol-gel processing. The prepared TCS were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption-desorption analysis. The photocatalytic performances of the composites were evaluated by the decolorization of an acid red 27 solution. The results show that the TCS have higher photocatalytic activity than bare TiO2 because of the smaller crystalline size of TiO2 and the higher amount of adsorbed acid red 27 as well as hydroxyl radicals. The photocatalytic activity of TCS increased and then decreased with an increase in surface area. The kinetic behavior of the photocatalytic degradation of acid red 27 over various composites is described in terms of a modified Langmuir-Hinshelwood model. The kinetic results clearly indicate differences in the photocatalytic activity of TCS, which is mainly attributed to interactions between the surface areas and the adsorption strength. TCS3 gave the highest photocatalytic activity with an optimal adsorption strength resulting from its moderate surface areas.



Key wordsPhotocatalysis      Titanium dioxide      Carbon      Supercriticalness      Sol-gel      Kinetics     
Received: 16 December 2010      Published: 13 May 2011
MSC2000:  O643  
Fund:  

The project was supported by the National Natural Science Foundation of China (50802034) and Natural Science Foundation of Hunan Province, China (09JJ6101).

Corresponding Authors: LI You-Ji     E-mail: bcclyj@163.com
Cite this article:

LI You-Ji, CHEN Wei, LI Lei-Yong. Effects of Surface Areas and Adsorption Strength on the Photoactivity and Decomposition Kinetics of Acid Red 27 over TiO2-Coated/Activated Carbon Composites. Acta Physico-Chimica Sinica, 2011, 27(07): 1751-1756.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20110701     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2011/V27/I07/1751

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