Citation: 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[J]. Acta Physico-Chimica Sinica, ;2011, 27(07): 1751-1756. doi: 10.3866/PKU.WHXB20110701 shu

Effects of Surface Areas and Adsorption Strength on the Photoactivity and Decomposition Kinetics of Acid Red 27 over TiO₂-Coated/Activated Carbon Composites

1.
College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, Hunan Province, P. R. China

Received Date: 16 December 2010
Available Online: 13 May 2011
Fund Project: 国家自然科学基金(50802034) (50802034)湖南省自然科学基金(09JJ6101)资助项目 (09JJ6101)

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.
- Photocatalysis,
- Titanium dioxide,
- Carbon,
- Supercriticalness,
- Sol-gel,
- Kinetics
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沈阳化工大学材料科学与工程学院沈阳 110142

Effects of Surface Areas and Adsorption Strength on the Photoactivity and Decomposition Kinetics of Acid Red 27 over TiO2-Coated/Activated Carbon Composites

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通讯作者: 陈斌, bchen63@163.com

Effects of Surface Areas and Adsorption Strength on the Photoactivity and Decomposition Kinetics of Acid Red 27 over TiO₂-Coated/Activated Carbon Composites