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Photocatalysis of Size Quantized TiO2 and Fe2O3 Prepared in Clay Interlayers and Nafion

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Microcrystalline TiO2 prepared in the interlayer spacings of sodium montmorillonite showed size-quantization effects and exhibited higher photocatalytic activities than a TiO2 bulk powrler used as a reference for decarboxylation of n-aliphatic carboxylic acids covering the number of carbons of a molecule from 2 to 8. The high activities of the TiO2 microcrystals exceeded the surface area difference between the two kinds of photocatalysts, and the difference observed is discussed in terms of differences in energy diagrams. Similar results were obtained for microcrystalline Fe2O3 prepared in sodium montmorillonite. The use of a cation exchange polymer Nafion allowed the preparation of size-quantized TiO2, but it was found that apparent photocatalytic activities for decarboxylation of acetic acid in acidic solutions were low compared to those of the bulk TiO2 due to specific adsorption of sulfonate groups of Nafion onto the active sites of the TiO2 microcrystals.

Affiliations: 1: Department of Applied Chemistry, Faculty of Engineering Osaka University 2-1, Yamada-oka, Suita, Osaka 656, JAPAN


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