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Photocatalytic degradation of dichloroacetyl chloride adsorbed on TiO2

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Abstract

Dichloroacetyl chloride (DCAC) attracted our attention as an intermediate product of the photocatalytic degradation of trichloroethylene (TCE). The adsorption and photocatalytic reaction of DCAC on TiO2 have been investigated by FTIR spectroscopy. The influence of the surface structure of several TiO2s on the reaction mechanism was discussed in order to understand the complete degradation mechanism of TCE as well as DCAC. DCAC was transformed into dichloroacetic acid (DCAA) on the relatively hydrophobic TiO2 surface by the small amount of the water molecules weakly adsorbed on the surface. This DCAA was degraded to phosgene, CO2, and CO during UV irradiation. For the hydrophilic TiO2, DCAC was mainly transformed into the dichloroacetate anion. UV irradiation allowed this species to produce chloroform in addition to phosgene, CO2, and CO. It is suggested that DCAC easily reacts with the Ti–OH group on the hydrophilic TiO2 and forms the bidentate titanium chelate of dichloroacetate, which efficiently degrades into chloroform.

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Authors and Affiliations

  1. Department of Environmental Science and Technology, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano, 380-8553, Japan

    Hiromasa Nishikiori, Makoto Tagahara, Leo Mukoyama & Tsuneo Fujii

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  1. Hiromasa Nishikiori
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  2. Makoto Tagahara
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  3. Leo Mukoyama
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  4. Tsuneo Fujii
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Correspondence to Hiromasa Nishikiori.

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Nishikiori, H., Tagahara, M., Mukoyama, L. et al. Photocatalytic degradation of dichloroacetyl chloride adsorbed on TiO2 . Res Chem Intermed 36, 947–957 (2010). https://doi.org/10.1007/s11164-010-0207-5

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  • DOI: https://doi.org/10.1007/s11164-010-0207-5

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