title: Application of porous nickel-coated TiO₂ for the photocatalytic degradation of aqueous quinoline in an internal airlift loop reactor.
abstract: P25 film, prepared by a facile dip-coating method without any binder, was further developed in a recirculating reactor for quinoline removal from synthetic wastewater. Macroporous foam Ni, which has an open three-dimensional network structure, was utilized as a substrate to make good use of UV rays. Field emission scanning electron microscopy and X-ray diffraction analysis showed that the coated/calcinated P25 films consisted of two crystal phases, and had a number of uniform microcracks on the surface. The effects of initial quinoline concentration, light intensity, reaction temperature, aeration, and initial pH were studied. Increased reaction time, light intensity, environmental temperature, and gas aeration were found to significantly improve the quinoline removal efficiency. The aeration effect of oxygen dependency on the quinoline degradation had the trend pure oxygen > air > no gas > pure nitrogen with free O₂. The solution pH crucially affected quinoline photodegradation; the high electrostatic adsorption of quinoline molecules on the TiO₂ surface was strongly pH dependent. 2-Pyridine-carboxaldehyde, 3-pyridinecarboxaldehyde, and 2(1H)-quinolinone were identified as the major intermediates of quinoline degradation. Based on these intermediates, a primary degradation mechanism was proposed. This reusable P25 film benefits the photodegradation of water contaminants and has potential in other various applications.
authors.affiliation: Department of Environmental Science and Engineering, Northeast Normal University, Changchun 130024, China.
authors.forename: Suiyi
authors.initials: S
authors.lastname: Zhu
authors.forename: Xia
authors.initials: X
authors.lastname: Yang
authors.forename: Wu
authors.initials: W
authors.lastname: Yang
authors.forename: Leilei
authors.initials: L
authors.lastname: Zhang
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Mingxin
authors.initials: M
authors.lastname: Huo
mesh_terms: D002384:Catalysis; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry*; D010777:Photochemistry; D011804:Quinolines / Q000737:chemistry*; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D014867:Water; D014961:X-Ray Diffraction
chemical_list: D011804:Quinolines; D014867:Water; C009495:titanium dioxide; D009532:Nickel; D014025:Titanium; C037219:quinoline