In:
Journal of Spectroscopy, Hindawi Limited, Vol. 2015 ( 2015), p. 1-8
Abstract:
The undoped and Mo-doped TiO 2 nanoparticles were synthesized by sol-gel method. The as-prepared samples were characterized by X-ray diffraction (XRD), diffuse reflectance UV-visible absorption spectra (UV-vis DRS), X-ray photoelectron spectra (XPS), and transmission electron microscopy (TEM). The photocatalytic activity was evaluated by photocatalytic degradation of methylene blue under irradiation of a 500 W xenon lamp and natural solar light outdoor. Effects of calcination temperatures and Mo doping amounts on crystal phase, crystallite size, lattice distortion, and optical properties were investigated. The results showed that most of Mo 6+ took the place of Ti 4+ in the crystal lattice of TiO 2 , which inhibited the growth of crystallite size, suppressed the transformation from anatase to rutile, and led to lattice distortion of TiO 2 . Mo doping narrowed the band gap (from 3.05 eV of TiO 2 to 2.73 eV of TiMo 0.02 O) and efficiently increased the optical absorption in visible region. Mo doping was shown to be an efficient method for degradation of methylene blue under visible light, especially under solar light. When the calcination temperature was 550°C and the Mo doping amount was 2.0%, the Mo-doped TiO 2 sample exhibited the highest photocatalytic activity.
Type of Medium:
Online Resource
ISSN:
2314-4920
,
2314-4939
Language:
English
Publisher:
Hindawi Limited
Publication Date:
2015
detail.hit.zdb_id:
2068433-2
SSG:
11
