Journal
APPLIED SURFACE SCIENCE
Volume 263, Issue -, Pages 254-259Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2012.09.039
Keywords
La/TiO2; Graphene; Composites; Visible-light; Photocatalysis
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Funding
- Natural Science Foundation of China [51072180]
- China Postdoctoral Science Foundation [20110491764]
- Fundamental Research Funds for the Central Universities [2009QNA4005]
- State Key Laboratory of Silicon Materials at Zhejiang University [SKL2009-14]
- Higher Education Commission of Pakistan for IRSIP scholarship
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La/TiO2-graphene composites used as photocatalyst were prepared by two-step hydrothermal method. The as-prepared composites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance spectroscopy (DRS) and photoluminescence spectroscopy (PL). The results of optical properties of La/TiO2-graphene composites exhibit extended light absorption in visible-light region and possess better charge separation capability as compared to pure TiO2. The photocatalytic activity measurement demonstrate that La/TiO2-graphene composites exhibited an enhanced photocatalytic activity for methylene blue (MB) degradation under visible-light irradiation compared to pure TiO2, which was attributed to greater adsorptivity of dyes, extended light absorption and increased charge separation efficiency due to excellent electrical properties of graphene and the large surface contact between graphene and La/TiO2 nanoparticles. (C) 2012 Elsevier B. V. All rights reserved.
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