Photochemical and photocatalytic degradation of trans-resveratrol.
Photochemical and photocatalytic degradation of the emerging pollutant trans-resveratrol has been studied under different irradiation wavelengths and using different TiO2 catalysts. trans-Resveratrol was more easily degraded when irradiated using the whole spectral range (UV-Vis) rather than with UV and near-UV to visible irradiation. The main intermediate of trans-resveratrol phototransformation was identified as its isomer cis-resveratrol. Different TiO2 catalysts were used to carry out the photocatalytic degradation of trans-resveratrol. Catalysts properties such as crystallite dimensions, surface area and presence of hydroxy surface groups are shown to be crucial to the photocatalytic efficiency of the materials tested. From the point of view of trans-resveratrol abatement, the photocatalytic process was more efficient than the pure photochemical one resulting in higher degradation rates and higher organic content removal. Six photoproducts of trans-resveratrol phototransformation were identified mainly resulting from the attack of the hydroxyl radical to the organic molecule.
Laboratory of Catalysis an Materials, Associate Laboratory, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal. cgsilva@fe.up.pt
Cláudia Gomes
CG
Silva
Judith
J
Monteiro
Rita R N
RR
Marques
Adrián M T
AM
Silva
Cristina
C
Martínez
Moisés
M
Canle
Joaquim Luís
JL
Faria
D002384:Catalysis; D007536:Isomerism; D007700:Kinetics; D008027:Light; D010782:Photolysis; D000077185:Resveratrol; D017550:Spectroscopy, Fourier Transform Infrared; D013267:Stilbenes / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry; D014466:Ultraviolet Rays
D013267:Stilbenes; C009495:titanium dioxide; D014025:Titanium; D000077185:Resveratrol