Photocatalytic degradation of trans-cinnamic, dihydro cinnamic, trans-caffeic, and dihydrocaffeic acids and characterization of the products

Catalysed degradation of aqueous solutions of cinnamic 1, dihydrocinnamic 2, dihydrocaffeic 3 and trans-caffeic 4 acids in the presence of (TiO(2)) and UV radiation and the products identified by HPLC, and after treatment with diazomethane by GC-MS have been studied. A pH range of 3 to 11 was used. The four acids, in the presence of TiO(2) in the dark, underwent little degradation. Extended irradiation of all the acids in the presence of TiO(2) produced complete degradation as shown by TOC measurements. initially the volume of carbon dioxide produced rose steadily to a constant value.