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Photocatalytic activities and mechanism of the supercritically treated TiO2-activated carbon composites on decomposition of acetaldehyde

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Abstract

The supercritically treated TiO2-activated carbon (Sc-TiO2-AC) composites were studied for their adsorption and subsequent photocatalytic activities for acetaldehyde. Sc-TiO2-AC composites showed much higher decomposing ability for acetaldehyde compared to a noncomposite comprising a simple mixture of activated carbon and TiO2. This indicates that Sc-TiO2-AC composites have a synergetic effect of adsorption and photocatalytic decomposition of acetaldehyde. Meanwhile, acetaldehyde was found to be decomposed to CO2 as final product by Sc-TiO2-AC composites through the conversion to methanol, formaldehyde and acetic acid as intermediates. It was also found that many OH groups exist on the Sc-TiO2-AC composites. These OH groups can be assumed to take part in the photocatalytic degradation of acetaldehyde.

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Authors and Affiliations

  1. Department of Socio-Environmental Energy Science, Graduate School of Energy Science, Kyoto University, Kyoto, 606-8501, Japan

    Hongmei Hou, Hisashi Miyafuji & Shiro Saka

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  1. Hongmei Hou
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  2. Hisashi Miyafuji
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  3. Shiro Saka
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Correspondence to Shiro Saka.

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Hou, H., Miyafuji, H. & Saka, S. Photocatalytic activities and mechanism of the supercritically treated TiO2-activated carbon composites on decomposition of acetaldehyde. J Mater Sci 41, 8295–8300 (2006). https://doi.org/10.1007/s10853-006-1009-4

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  • DOI: https://doi.org/10.1007/s10853-006-1009-4

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