Graphene-wrapped hierarchical TiO2 nanoflower composites with enhanced photocatalytic performance

This study reports the synthesis of hierarchical TiO2 nanoflowers using a facile solvothermal method with significantly improved photocatalytic degradation of methylene blue under UV irradiation

Gregory Lui; Jin-Yun Liao; Aoshu Duan; Zisheng Zhang; Michael Fowler; Aiping Yu

2013

Scholarcy highlights

  • As the world faces growing concerns regarding environmental issues and energy sources, the scientific community is looking for cleaner solutions to existing problems
  • Graphene has the potential for providing certain benefits to pure TiO2 photocatalysis: i) the highly conjugated surface of graphene allows for preferential adsorption of aromatic compounds through π–π stacking; ii) the addition of graphene has been shown to produce a red-shift in light absorption; iii) and, the presence of two-dimensional graphene can improve the electrical conductivity of the overall material and act as an electron acceptor to reduce recombination
  • This study reports the synthesis of hierarchical TiO2 nanoflowers using a facile solvothermal method with significantly improved photocatalytic degradation of methylene blue under UV irradiation
  • This study reports the synthesis of graphene-wrapped hierarchical TiO2 nanoflowers using a facile hydrothermal method with significantly improved photocatalytic degradation of MB under UV irradiation
  • Using BET and Electrochemical Impedance Spectroscopy analysis, this improvement is on the basis of improved charge transport along the hierarchical structure as opposed to increased surface area
  • Diffuse Reflectance UV-Vis Spectroscopy showed that the TiO2 nanoflower had a slightly smaller band gap than P25

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