比表面积和吸附强度对TiO2/活性炭复合体光催化降解酸性红27 活性和动力学的影响

doi:10.3866/PKU.WHXB20110701

Abstract

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 words: Photocatalysis, Titanium dioxide, Carbon, Supercriticalness, Sol-gel, Kinetics

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 Phys. -Chim. Sin., 2011, 27(07): 1751-1756.

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