PREPARATION OF MOS2/G-C3N4 COMPOSITE PHOTOCATALYST AND ITS VISIBLE LIGHT CATALYTIC PERFORMANCE
In this study,hydrothermal synthesis and ultrasonic method were used to construct MoS2/g-C3N4 composite catalyst.The structure of the composite catalyst was characterized by X-ray powder diffraction(XRD),scanning electron microscopy(SEM),infrared spectroscopy(IR)and UV-Vis.The photocatalytic degradation of Rhodamine B(RhB)was investigated by using MoS2/g-C3N4 composite catalyst with different mass ratio as a probe.The results showed that the degradation rate of 10 mg/L RhB solution was 96.7％when MoS2 load was 30％and photocatalyzed for 80 min.Compared with pure g-C3N4,MoS2/g-C3N4 composite catalyst significantly improved the degradation effect of MoS2 on RhB.The improvement of photocatalytic degradation performance can be attributed to the fact that the heterojunction interface of MoS2 and g-C3N4 between the two semiconductors effectively inhibits the recombination of photogenerated electrons(e)and holes(h+).Finally,by reasoning the photocatalytic degradation mechanism of the composite photocatalyst,the charge transfer mechanism of MoS2/g-C3N4 is the same as that of type Ⅱ heterojunction,so it can be concluded that the composite belongs to type Ⅱheterojunction.
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