Study on carbon quantum dots/BiFeO3 heterostructures and their enhanced photocatalytic activities under visible light irradiation
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Carbon quantum dots/Bismuth ferrite (CQDs/BiFeO3) composite materials were successfully synthesized by a facile hydrothermal treatment of Fe(NO3)3·9H2O, Bi(NO3)3·5H2O and CQDs solutions. The structural and optical characteristics of the composite materials were characterized by X-ray diffraction, Fourier transform infra-red spectroscopy, transmission electron microscopy and ultraviolet–visible absorption, respectively. The photocatalytic activities of pure BiFeO3, CQDs and CQDs/BiFeO3 composite materials had also been carried out by using Rhodamine B as test stuff. The experimental results indicated that for QDs/BiFeO3 composite materials, the CQDs were attached to the surfaces of BiFeO3 materials, CQDs and BiFeO3 belong to different phase. Owing to the heterojunction formed at the interface between CQDs and BiFeO3 materials together with CQDs as an electron reservoir, the photocatalytic activities of CQDs/BiFeO3 composite materials were significantly improved. Especially, the CQDs/BiFeO3 composite sample with 3.3 wt% CQDs has the highest degradation rate, which was about 7.3, 3.7 times higher than those of pure BiFeO3 and CQDs, respectively. Moreover, the mechanism of RhB degradation catalyzed by CQDs/BiFeO3 composite materials was also thoroughly explained.
KeywordsPhotocatalytic Activity Composite Sample BiFeO3 Visible Light Irradiation BiVO4
This study is financed by the priority academic program development of Jiangsu Higher Education Institutions (PAPD), China.