rGO Functionalized ZnO–TiO2 Core-Shell Flower-Like Architectures for Visible Light Photocatalysis

Catalysts

Spyros Dokianakis¹  Evangelia Vasilaki¹  Nikos Katsarakis¹  Maria Vamvakaki² 

[1] Center of Materials Technology and Photonics, Hellenic Mediterranean University, 714 10 Heraklion, Crete, Greece;Department of Materials Science and Technology, University of Crete, 700 13 Heraklion, Crete, Greece;

关键词: titanium dioxide;    zinc oxide;    photocatalysis;    hybrid materials;    reduced graphene oxide;    complex architectures;   

DOI  :  10.3390/catal11030332

来源: DOAJ

【 摘 要 】

Core-shell heterostructures with a complex, flower-like morphology, comprising a ZnO core and a TiO₂ shell decorated with reduced graphene oxide (rGO) sheets by hydrothermal wrapping, are reported to extend the absorption properties of the semiconductors toward the visible light range. The ternary photocatalysts were characterized by X-ray diffraction, field emission scanning electron microscopy, Raman spectroscopy, diffuse reflectance UV–Vis, and attenuated total reflectance-Fourier transform infrared spectroscopy. Its photocatalytic performance was evaluated under visible light irradiation using methylene blue dye as a model pollutant. The rGO-modified ZnO–TiO₂ photocatalyst exhibited superior photoactivity compared to that of the parent ZnO–TiO₂ core-shell structures, which was dependent on its graphene content. The enhanced photocatalytic response was attributed to the higher absorption in the visible light range, as well as the pronounced electron and hole separation in the ternary system.

【 授权许可】

Unknown