Photocatalytic oxidation of cyclohexane over TiO2 nanoparticles by molecular oxygen under mild conditions
发表时间：2019-11-01
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- 论文类型：
- 期刊论文
- 第一作者：
- Li, XY
- 通讯作者：
- Li, XY (reprint author), Dalian Univ Technol, Sch Environm & Biol Sci & Technol, Dalian 116023, Peoples R China.
- 合写作者：
- Chen, GH,Po-Lock, Y,Kutal, C
- 发表时间：
- 2003-12-01
- 发表刊物：
- JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
- 收录刊物：
- SCIE
- 文献类型：
- J
- 卷号：
- 78
- 期号：
- 12
- 页面范围：
- 1246-1251
- ISSN号：
- 0268-2575
- 关键字：
- photocatalytic selective oxidation; cyclohexane; titanium dioxide; oxide semi-conductors; nanosize particles
- 摘要：
- The structure, physical characteristics and photocatalytic selective oxidation properties of nanometer-size TiO2 particles produced by a sol-gel method were studied by X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR) and photocatalytic selective oxidation measurements. Analysis of the XRD results shows that sol-gel-produced TiO2 nanoparticles have the anatase structure at annealing temperatures less than or equal to973 K, that the rutile structure begins to emerge at annealing temperatures greater than or equal to973 K and the particles have the pure rutile structure at 1023 K. DRS indicates that the obtained TiO2 nanoparticles exhibit a blue shift with decreasing crystallite size. Analysis of the XPS results shows that the TiO2 nanoparticles have a lot of oxygen vacancies. The EPR spectrum of TiO2 at 77 K is composed of a strong isotropic EPR Surface-Ti3+ signal(l) at g = 1.926 and a weak broad Bulk-Ti3+ signal (11) at g = 1.987. Quantitative EPR indicates that both signals show a size and temperature dependence. Photocatalytic oxidation of cyclohexane into cyclohexanol with high selectivity and activity has been obtained by activation of molecular oxygen over sol-gel-produced TiO2 nanoparticles under mild conditions in dry solvent, which reveals that the quantum size effect and surface state effect of nanoparticles are key points for governing the selective photocatalytic reaction. The photocatalytic oxidation mechanism under dry solvent is different from that in aqueous solutions. (C) 2003 Society of Chemical Industry.
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