In situ self-assembly of 3D hierarchical 2D/2D CdS/g-C3N4 hereojunction with excellent photocatalytic performance

摘要

A novel hierarchical 2D/2D CdS/g-C3N4 hybridarchitecture was synthesized via a hydrothermal method and then characterized by XRD, FTIR, SEM, EDS, UV-vis DRS, PL, BET, and EIS. The results showed the combination of CdS and g-C3N4 changed the growth orientation of dendritic CdS nanocrystallines and promoted the high degree of exfoliation of g-C3N4, which provided the close nanosheet/nanosheet 2D/2D contact interface and large specific surface area, resulting in the effective separation of the photo-generated carrier pairs. The photocatalytic activity of CdS/g-C3N4 was 6.93 and 3.64 times higher than that of the pure g-C3N4 and CdS samples, respectively, in the degradation of RhB under visible light irradiation. The CdS/g-C3N4 showed no obvious loss of the photocatalytic activity and little change of structure after three repeated runs, which is vital in the application of photocatalyst. This could be contributed to the reinforced hierarchical 3D architecture constructed through the dendritic CdS nanosheet penetrating into g-C3N4 interlayers. The possible mechanism for formation and photocatatlytic activity of the CdS/g-C3N4 architecture was proposed.