Morphological control of anodic crystalline TiO 2 nanochannel films for use in size-selective photocatalytic decomposition of organic molecules

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Abstract

We report the size-selective photocatalytic decomposition of organic molecules using crystalline anodic TiO 2 nanochannel films as the photocatalyst. The porous TiO 2 films were formed by anodizing titanium at 20 V in glycerol electrolyte containing various amounts of K 3 PO 4 , K 2 HPO 4 , and KH 2 PO 4 at 433 K. Regardless of the electrolyte composition, the as-formed TiO 2 films had a crystalline anatase structure. The basicity of the electrolyte markedly influenced the morphology of the TiO 2 nanochannel films; more regular nanochannels developed with increasing basicity of the electrolyte. Because the diameter of the nanochannels in the films formed in a basic electrolyte was as small as ∼10 nm, the anodic TiO 2 nanochannel films with a thickness of 5 μm revealed a selective photocatalytic decomposition of methylene blue (MB) in a mixture of MB and direct red 80 (DR) kept under UV irradiation. The importance of the diameter of the nanochannels and their uniformity for size-selective decomposition of organic molecules were investigated. © 2014 Elsevier B.V. All rights reserved.

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Tsuji, E., Taguchi, Y., Aoki, Y., Hashimoto, T., Skeldon, P., Thompson, G. E., & Habazaki, H. (2014). Morphological control of anodic crystalline TiO 2 nanochannel films for use in size-selective photocatalytic decomposition of organic molecules. In Applied Surface Science (Vol. 301, pp. 500–507). Elsevier B.V. https://doi.org/10.1016/j.apsusc.2014.02.113

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