Abstract：In this study, CQDs/g-C3N4 was prepared by using ascorbic acid and urea as precursors. The characterizations of CQDs/g-C3N4 were carried out by X-ray diffraction (XRD), ultraviolet visible light diffuse reflection (UV-vis), transmission electron microscopy (TEM), fluorescence spectrum (PL), X-ray photoelectron spectroscopy (XPS). The results showed that carbon quantum dots were well loaded onto the surface of graphite phase carbon nitride bringring about the active sites of g-C3N4 increase. The CQDs modification could effectively improve the visible light absorbance of g-C3N4, as well as decrease its band gap. At the same time, the addition of carbon quantum dots could inhibit the recombination of photogenerated electron-hole pair in catalyst. Under simulated light irradiation, the RhB photodegradation ability of CQDs/g-C3N4 was significantly higher than that of single g-C3N4. 56.7% of RhB could be degraded over 0.01g of CQDs/g-C3N4 at 80℃ in 3h. Capture agent experiment result showed that superoxide radical played a major role in the photodegradation reaction system.
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