• 文献标题:   Synthesis and photocatalytic properties of visible light responsive La/TiO2-graphene composites
  • 文献类型:   Article
  • 作  者:   KHALID NR, AHMED E, HONG ZL, AHMAD M
  • 作者关键词:   la/tio2, graphene, composite, visiblelight, photocatalysi
  • 出版物名称:   APPLIED SURFACE SCIENCE
  • ISSN:   0169-4332 EI 1873-5584
  • 通讯作者地址:   Zhejiang Univ
  • 被引频次:   61
  • DOI:   10.1016/j.apsusc.2012.09.039
  • 出版年:   2012

▎ 摘  要

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.