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In Situ ATR-FTIR Investigation of Photodegradation of 3,4-Dihydroxybenzoic Acid on TiO2

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Abstract

The catalytic photo-oxidation of 3,4-dihydroxybenzoic acid on TiO2 has been studied by in situ ATR-FTIR in flowing water and in flowing wet air/nitrogen gas. In flowing water it was difficult to observe photodegradation intermediates despite photocatalytic action during UV illumination. In the flowing wet air/nitrogen system carboxylic acids and carbonates were observed. It was shown that water plays an important role in the formation of oxidation active species. Oxygen shows a prominent role for carboxylic acid degradation, but the photogenerated hole plays the important role for the 3,4-dihydroxybenzoic acid ring cleavage.

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Acknowledgments

The generous financial support by the National Science Foundation of China (nos. 41076040 and 41230858) is gratefully acknowledged.

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Correspondence to Xuefeng Hu.

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Hu, X., Bürgi, T. In Situ ATR-FTIR Investigation of Photodegradation of 3,4-Dihydroxybenzoic Acid on TiO2 . Catal Lett 146, 2215–2220 (2016). https://doi.org/10.1007/s10562-016-1838-y

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  • DOI: https://doi.org/10.1007/s10562-016-1838-y

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