Photocatalytic degradation of pentachlorophenol on TiO2 sol-gel catalysts.
The photocatalytic degradation of pentachlorophenol (PCP) in aqueous solution was investigated using TiO2 catalysts. The samples were prepared by the sol-gel method using different gelation pH and different calcination temperatures. The solids were characterized by specific surface area, X-ray diffraction, UV-Vis absorbance, FTIR and pentachlorophenol adsorption. The catalytic activity of the solids was evaluated in a conventional photoreactor at 298 K using 30 ppm of pentachlorophenol. It was found that the reaction follows a first-order reaction and the kinetic constant values change slightly with the pH of gelation and more significantly with the calcination temperature.
Pecchi
G
G
Departamento de Físico-Química, Facultad de Ciencias Químicas, Universida de Conceptión, Chile. gpecchi@udec.cl
Reyes
P
P
Sanhueza
P
P
Villaseñor
J
J
D000327:Adsorption / Q000187:drug effects; D002384:Catalysis / Q000187:drug effects / Q000528:radiation effects; D004785:Environmental Pollutants / Q000528:radiation effects; D006863:Hydrogen-Ion Concentration; D017745:Incineration; D008027:Light; D009584:Nitrogen / Q000493:pharmacokinetics; D010416:Pentachlorophenol / Q000737:chemistry* / Q000528:radiation effects; D017319:Photosensitizing Agents / Q000494:pharmacology*; D013056:Spectrophotometry, Ultraviolet; D014025:Titanium / Q000494:pharmacology*; D014961:X-Ray Diffraction
D004785:Environmental Pollutants; D017319:Photosensitizing Agents; C009495:titanium dioxide; D014025:Titanium; D010416:Pentachlorophenol; D009584:Nitrogen