title: Photocatalytic degradation of quinoline in aqueous TiO2 suspension.
abstract: Anatase TiO(2) nanoparticles with an average size of 16 nm were synthesized via a modified sol-gel method and were employed to degrade quinoline under UV irradiation (λ=365 nm). The influence of reaction parameters such as TiO(2) dosage, initial quinoline concentration and pH was investigated. Under the optimized reaction condition, 91.5% photodegradation efficiency of quinoline was achieved. When the TiO(2) nanoparticles were reused for four times, the photodegradation efficiency was still as high as 90.6%. The analysis of the organic intermediates suggested that superoxide radical (O(2)) predominantly attacked the pyridine ring of quinoline leading to the formation of 2-aminobenzaldehyde, 2-quinolinone, 4-quinolinone; while the hydroxyl radical (OH) contributed much less by attacking benzene rings resulting in the formation of 5-hydroxyquinoline. The photocatalytic performance of the as-synthesized TiO(2) nanoparticles was comparable to the commercial P25. A tentative mechanism was postulated for the photodegradation of quinoline over TiO(2) nanoparticles.
authors.affiliation: Key Laboratory of Coal Science and Technology of Shanxi Province and Ministry of Education, Taiyuan University of Technology, Shanxi 030024, China.
authors.forename: Jieying
authors.initials: J
authors.lastname: Jing
authors.forename: Wenying
authors.initials: W
authors.lastname: Li
authors.forename: Adina
authors.initials: A
authors.lastname: Boyd
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Vicki L
authors.initials: VL
authors.lastname: Colvin
authors.forename: William W
authors.initials: WW
authors.lastname: Yu
mesh_terms: D002384:Catalysis; D007700:Kinetics; D010782:Photolysis; D011804:Quinolines / Q000737:chemistry* / Q000528:radiation effects; D013481:Superoxides / Q000737:chemistry; D013535:Suspensions; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D011804:Quinolines; D013535:Suspensions; D013481:Superoxides; C009495:titanium dioxide; D014025:Titanium; C037219:quinoline