Abstract
Graphite carbon (GC)/TiO2 composites were synthesized though a facile one-step thermal heating method. Degussa P25 TiO2 was employed as main precursor and commercial available tryptone was used as pore-forming carbon source. X-ray diffraction, Raman spectroscopy, transmission electron microscopy, nitrogen adsorption-desorption analysis and X-ray photoelectron spectroscopy demonstrated the presence of a GC layer and a unique core@shell structure of TiO2/GC composites. The novel TiO2@GC catalysts, which possessed abundant mesopores, exhibited strong catalytic activities in Cr6+ photoreduction under visible light irradiation. The TP-550 photocatalyst showed 7-fold higher activity compared with P25 TiO2, which can be ascribed to the formation of TiO2@GC heterojunction and its unique mesoporous structure.
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