期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 237, 期 -, 页码 247-255出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2012.08.037
关键词
Photodegradation; Quinoline; Titanium dioxide; Nanoparticle
资金
- Shanxi Returned Scholarship
- Program for Changjiang Scholars
- Innovative Research Team in University of MOE [IRT0517]
- 863 Project [2011AA050509]
- Center for Biological and Environmental Nanotechnology through NSF [EEC-0647452]
- China Scholarship Council (CSC) [2009693001]
Anatase TiO2 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 (lambda = 365 nm). The influence of reaction parameters such as TiO2 dosage, initial quinoline concentration and pH was investigated. Under the optimized reaction condition, 91.5% photodegradation efficiency of quinoline was achieved. When the TiO2 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-center dot(2)) predominantly attacked the pyridine ring of quinoline leading to the formation of 2-aminobenzaldehyde, 2-quinolinone, 4-quinolinone: while the hydroxyl radical ((OH)-O-center dot) contributed much less by attacking benzene rings resulting in the formation of 5-hydroxyquinoline. The photocatalytic performance of the as-synthesized TiO2 nanoparticles was comparable to the commercial P25. A tentative mechanism was postulated for the photodegradation of quinoline over TiO2 nanoparticles. 2012 Elsevier B.V. All rights reserved.
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