T. Tran, A. Nosaka, Y. Nosaka
Dec 15, 2007
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Influential Citations
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Journal
Journal of Photochemistry and Photobiology A-chemistry
Abstract
Abstract The adsorption and photodecomposition of a dipeptide, alanyl-tryptophan (Ala-Trp) on a TiO 2 surface were investigated by zeta potential measurements and 1 H NMR spectroscopy in TiO 2 aqueous suspension systems. The photodecomposition rate of Ala-Trp was lower than that of Trp but higher than that of Ala (Ala 2 . The adsorptions of the molecule on the basic terminal OH sites through the carboxyl group or the peptide bond, or on the acidic bridged OH sites through NH 2 group were also suggested. However, the photocatalytic reactivities for such adsorptions are considered to be lower. A plausible adsorption scheme is presented with the decomposition efficiency.