Hydrothermal Synthesis of TiO2 Nanostructured Arrays and Their Photocatalytic Activity for Methylene Blue Degradation in Microreactor
Oriented titanium dioxide (TiO2) thin film arrays were directly synthesized on a titanium plate by hydrothermal method. A titanium plate was put into 50 ml solution of 10 M NaOH in a 50 ml teflon-lined stainless steel autoclave and heated to temperature of 180°C for 3-48 h in an oven. The sample was completely washed with distilled water and dried in the oven at 80°C. The resulting sample consisted of sodium titanate thin film on the plate. To transform sodium titanate into hydrogen titanate, the sample was washed with 100 ml of 0.1 M HCl. Thereafter, the distilled water was used to remove excess HCl on the sample. After dried, the sample was calcined at 600°C for 2 h to transform the hydrogen titanate into titanium dioxide. The samples were characterized by scanning electron microscope (SEM, Hitachi S-3400N TypeII), transmission electron microscope (TEM, Hitachi H-9000UHR III), and X-ray diffraction (XRD, Bruker D8 Advance) to observe morphology, crystal structure, and crystalline phase, respectively, of the TiO2 thin film. The photocatalytic activity of the samples was tested by means of methylene blue (MB) degradation in a microreactor equipped with UV lamp (wavelength of 253.7 nm). As the result, the control of morphology, size and structure of TiO2 thin film was achieved by varying the hydrothermal time and calcination temperature. After 3 h of hydrothermal reaction at 180°C, the TiO2 thin film was observed on the surface of the titanium plate. As the hydrothermal time was increased from 3 to 48 h, the roughness of the film was increased by the sequential formation of titanate nanosheets, nanotubes and nanofibers, respectively. Upon the calcination at 600°C for 2 h, the TiO2 nanotubes deformed into lumpshaped aggregates, while the form of nanofibers could withstand the thermal transformation.
TiO2 thin film Hydrothermal process Degradation
N. Dech-rat N. Viriya-empikul K. Faungnawakij V. Pavarajarn
Center of Excellence in Particle Technology,Faculty of Engineering,Chulalongkorn University,Bangkok, National Nanotechnology Center,National Science and Technology Development Agency Thailand Science P
国际会议
西安
英文
1130-1137
2011-08-17（万方平台首次上网日期，不代表论文的发表时间）