Search results for "Energy transfer proce"

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Photochemical and photocatalytic isomerization of trans -caffeic acid and cyclization of cis -caffeic acid to esculetin

2016

Abstract The photoisomerization of trans-caffeic acid to cis-caffeic acid has been studied in the presence of N2 in homogeneous aqueous solutions and in suspensions of various TiO2 catalysts. The results supported the hypothesis of an energy transfer process from TiO2 to the substrate due to the recombination of the photogenerated electron–hole pairs. The differences among the measured photostationary [cis]/[trans] ratios have been attributed to the different physico-chemical properties of the catalysts. In particular, the lowest ratio measured in the presence of Merck TiO2 was ascribed to the very low adsorption of trans-caffeic acid onto the surface of this sample. In the presence of O2 a…

Esculetin formationPhotoisomerization02 engineering and technology010402 general chemistryPhotochemistry01 natural sciencesCatalysisCatalysiCatalysischemistry.chemical_compoundAdsorptionPhotoisomerizationCaffeic acidTiO2General Environmental ScienceCaffeic acidSettore ING-IND/24 - Principi Di Ingegneria ChimicaAqueous solutionChemistryProcess Chemistry and Technologyfood and beveragesSubstrate (chemistry)021001 nanoscience & nanotechnology0104 chemical sciencesPhotocatalysisSettore CHIM/07 - Fondamenti Chimici Delle Tecnologie0210 nano-technologyIsomerizationEnergy transfer proceApplied Catalysis B: Environmental

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