title: Photocatalytic reactions of pyrene at TiO2/water interfaces.
abstract: The photocatalytic oxidation of pyrene preadsorbed on TiO2 is examined in aqueous suspension under UV irradiation. Chemical oxygen demand measurements, UV-VIS spectrophotometer, infrared spectrometer and GC-MS analytical techniques were used to monitor the formed intermediates. During the oxidation processes, the ring-open reaction, hydroxylation and ketolysis occurred to produce some intermediate products (4-oxapyrene-5-one, 1,6- or 1,8-pyrenediones, 4,5-phenanthrenedialdehyde, cyclopenta[def]phenanthrene). Some factors affecting the photodegradation rate were also studied. The results were different from other studies: The pH of the dispersion, ratio of Py/TiO2:water had little effect on the photooxidation rate of pyrene catalyzed by TiO2, while the surface coverage, addition of Fe3+ affected it greatly.
authors.affiliation: State Key Laboratory of Organic Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Wen
authors.forename: Jincai
authors.initials: J
authors.lastname: Zhao
authors.forename: Guoying
authors.initials: G
authors.lastname: Sheng
authors.forename: Jiamo
authors.initials: J
authors.lastname: Fu
authors.forename: Ping'an
authors.initials: P
authors.lastname: Peng
mesh_terms: D000327:Adsorption; D002384:Catalysis; D008401:Gas Chromatography-Mass Spectrometry; D010084:Oxidation-Reduction; D010782:Photolysis; D011721:Pyrenes / Q000737:chemistry* / Q000528:radiation effects; D012995:Solubility; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D011721:Pyrenes; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C030984:pyrene; D014025:Titanium