In Situ ATR-FTIR Investigation of Photodegradation of 3,4-Dihydroxybenzoic Acid on TiO2
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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.
KeywordsIn situ spectroscopy Photocatalysis Attenuated total reflection TiO2 3,4-dihydroxybenzoic acid
The generous financial support by the National Science Foundation of China (nos. 41076040 and 41230858) is gratefully acknowledged.
- 9.Borah JM, Sarma J, Mahiuddin S, Colloid Surf A 387:50Google Scholar