Synthesis and Photocatalytic Properties of CuS/CQDs/g-C3N4

CQDs (Carbon quantum dots) were obtained by hydrothermal method with lemon juice as the carbon source. CuS/CQDs/g-C3N4 was synthesized using copper trihydrate nitrate (Cu(NO3)2·3H2O), thiourea(CH4N2S) and lemon juice as starting materials via ultrasonic shock method. CuS/CQDs/g-C3N4 three-phase composite photocatalyst with p-n-type heterojunction structure was obtained successfully. The structure and morphology of the material were analyzed by various methods, such as XRD, SEM, TEM, XPS, PL, BET and UV-Vis. The results showed that the interface structure is well constructed with high purity and uniform distribution. In the photocatalytic degradation experiment, the best photocatalytic degradation of the CuS/CQDs/g-C3N4 composite was achieved at approximately 72.1% when the CuS content was 10wt%. After the RhB degradation in 4 cycles, the photocatalytic degradation efficiency of the composite material was not significantly reduced, and it still remained at 65.2%. Finally, it is clear that ·O2-radical is the main factor in photocatalytic degradation, and h+ radical is the second factor. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.