Chemical Physics Letters, Vol.730, 391-398, 2019
Fabrication of carbon quantum dots/TiO2/Fe2O3 composites and enhancement of photocatalytic activity under visible light
Carbon quantum dots/TiO2/Fe2O3 photocatalytic composite was prepared through multi-step hydrothermal method. The CQDs/TiO2/Fe2O3 composite showed enhanced photocatalytic performance for methylene blue dye photodegration when compared with TiO2/Fe2O3 and pure TiO2 under the visible light irradiation. The mechanism of the improved photocatalytic activity over CQDs/TiO2/Fe2O3 were also investigated. The CQDs can better capture and transfer photogenerated electrons through the Ti-O-C and Fe-O-C bonds. What's more, CQDs can improve the utilization of photogenerated electrons and the electrons in CQDs are captured by O-2 to produce O-center dot(2)- radicals and the role of O-center dot(2)- radicals in the photocatalytic process is significantly improved.