title: Synthesis of mesoporous β-Ga2O3 nanorods using PEG as template: preparation, characterization and photocatalytic properties.
abstract: Mesoporous wide bandgap semiconductors offer high photocatalytic oxidation and mineralization activities. In this study, mesoporous β-Ga(2)O(3) diamond nanorods with 200-300 nm in diameter and 1.0-1.2 μm in length were synthesized via a urea-based hydrothermal method using polyethylene glycol (PEG) as template agent. The UV photocatalytic oxidation activity of β-Ga(2)O(3) for gaseous toluene was evaluated, and 7 kinds of intermediates were monitored online by a proton transfer reaction mass spectrometry. Photoluminescence spectra manifested that the dosage and molecular weight of PEG are crucial for formation of vacancies and photocatalytic oxidation activities. A PEG-assisted hydrothermal formation mechanism of mesoporous β-Ga(2)O(3) diamond nanorods was proposed. Based on the health risk influence index (η) of the intermediates, the calculated health risks revealed that the β-Ga(2)O(3) nanorods with a η value of 9.6 are much safer than TiO(2) (η = 17.6).
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China. weirong@mail.hz.zj.cn
authors.forename: Weirong
authors.initials: W
authors.lastname: Zhao
authors.forename: Yong
authors.initials: Y
authors.lastname: Yang
authors.forename: Rui
authors.initials: R
authors.lastname: Hao
authors.forename: Feifei
authors.initials: F
authors.lastname: Liu
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Min
authors.initials: M
authors.lastname: Tan
authors.forename: Jing
authors.initials: J
authors.lastname: Tang
authors.forename: Daqing
authors.initials: D
authors.lastname: Ren
authors.forename: Dongye
authors.initials: D
authors.lastname: Zhao
mesh_terms: D002384:Catalysis; D004777:Environment; D005708:Gallium / Q000737:chemistry*; D008027:Light; D013058:Mass Spectrometry / Q000379:methods; D046529:Microscopy, Electron, Transmission / Q000379:methods; D015233:Models, Statistical; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D010777:Photochemistry / Q000379:methods; D011092:Polyethylene Glycols / Q000737:chemistry*; D011522:Protons; D012306:Risk; D014050:Toluene / Q000737:chemistry; D014508:Urea / Q000737:chemistry
chemical_list: D011522:Protons; D014050:Toluene; D011092:Polyethylene Glycols; C038863:gallium oxide; D014508:Urea; D005708:Gallium; D010100:Oxygen