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Gallic acid adsorbs onto TiO 2 films deposited onto an ATR crystal in two steps, both described by the kinetic Langmuir equation, as shown by measuring the spectral changes due to adsorbed species. Both pathways lead to species with the same spectral signature.Upon irradiation for preset times, integrated spectral absorbance profiles (log(A/A 0 ) vs time) for the adsorbate peaks coincides...
The catalytic photo-oxidation on TiO 2 (Degussa P-25) of oxalic acid at pH 3.7 and of catechol at pH 6.2 has been studied by in situ ATR–FT-IR. In the case of catechol, both FT-IR and HPLC demonstrate the formation of an intermediate, the accumulation of carbonate, and the depletion of the ligand on the illuminated surface. Ligand depletion is also demonstrated by the spectral evolution of...
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