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

Author: Yoneyama, H.

Source: Research on Chemical Intermediates, Volume 15, Number 2, 1991 , pp. 101-111(11)

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Abstract:

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.

Document Type: Research article

DOI: http://dx.doi.org/10.1163/156856791X00011

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

Publication date: 1991-01-01