title: The comparative photodegradation activities of pentachlorophenol (PCP) and polychlorinated biphenyls (PCBs) using UV alone and TiO2-derived photocatalysts in methanol soil washing solution.
abstract: Photochemical treatment is increasingly being applied to remedy environmental problems. TiO2-derived catalysts are efficiently and widely used in photodegradation applications. The efficiency of various photochemical treatments, namely, the use of UV irradiation without catalyst or with TiO2/graphene-TiO2 photodegradation methods was determined by comparing the photodegadation of two main types of hydrophobic chlorinated aromatic pollutants, namely, pentachlorophenol (PCP) and polychlorinated biphenyls (PCBs). Results show that photodegradation in methanol solution under pure UV irradiation was more efficient than that with either one of the catalysts tested, contrary to previous results in which photodegradation rates were enhanced using TiO2-derived catalysts. The effects of various factors, such as UV light illumination, addition of methanol to the solution, catalyst dosage, and the pH of the reaction mixture, were examined. The degradation pathway was deduced. The photochemical treatment in methanol soil washing solution did not benefit from the use of the catalysts tested. Pure UV irradiation was sufficient for the dechlorination and degradation of the PCP and PCBs.
authors.affiliation: Department of Environmental Science and Engineering, Tsinghua University, Beijing, P.R. China.
authors.forename: Zeyu
authors.initials: Z
authors.lastname: Zhou
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Hunan, P.R. China.
authors.forename: Yaxin
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Environmental Science and Engineering, Tsinghua University, Beijing, P.R. China.
authors.forename: Hongtao
authors.initials: H
authors.lastname: Wang
authors.affiliation: Department of Environmental Science and Engineering, Tsinghua University, Beijing, P.R. China.
authors.forename: Tan
authors.initials: T
authors.lastname: Chen
authors.affiliation: Department of Environmental Science and Engineering, Tsinghua University, Beijing, P.R. China.
authors.forename: Wenjing
authors.initials: W
authors.lastname: Lu
mesh_terms: D002384:Catalysis / Q000528:radiation effects; D006863:Hydrogen-Ion Concentration; D000432:Methanol / Q000737:chemistry*; D010416:Pentachlorophenol / Q000737:chemistry*; D010777:Photochemistry / Q000379:methods; D011078:Polychlorinated Biphenyls / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012996:Solutions; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D012987:Soil; D012996:Solutions; C009495:titanium dioxide; D014025:Titanium; D010416:Pentachlorophenol; D011078:Polychlorinated Biphenyls; D000432:Methanol