Two‐Step Self‐Assembly CdS/g‐C₃N₄ Heterostructure Composites with Higher Photocatalytic Performance Under Visible Light Irradiation

Abstract

Different percentages of CdS/g-C 3 N 4 heterostructure composite photocatalysts are fabricated to promote the visible light-driven photocatalytic performance via a two-step self-assembly procedure. The prepared samples are studied by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-Vis diffuse reflection spectra (DRS), steady-state and timeresolved photoluminence. In the photocatalytic experiment, the CdS/g-C 3 N 4 heterostructure composites display higher photocatalytic performance, which is proved by considering Rhodamine B (RhB) under visible light irradiation. The g-C 3 N 4 mass ratios of CdS/g-C 3 N 4 are adjusted, 5 wt% of g-C 3 N 4 as sample CdS/g-C 3 N 4 -5 (CN5) displayed excellent photocatalytic performance. The degradation of RhB reaches 95% within 150 min under visible light irradiation. The photocatalytic performance of the CdS/g-C 3 N 4 heterostructure composites are increased because of the cooperative effects between CdS and g-C 3 N 4 and the well-matched band gap structure. These facilitate effective separation of charges and effectively reduced electron-hole recombination, resulting in the higher photocatalytic performance.

2D Amorphous CoO Incorporated g‐C3N4 Nanotubes for Improved Photocatalytic Performance

“…[27] The morphology control and energy band engineering synergistically construct 2D/2D type-II heterojunction is an effective method. [28][29][30][31] It can achieve effective separation of carriers while shortening the distance of the carriers participating in the reaction, and provide a larger specific surface area and a large amount of reactive site. [32][33][34][35] Considering the lone pair of N/O at the edge of CN, it is reasonable to be applied to anchor cobalt ions with empty orbitals on the surface of CN, so as to construct 2D/2D CN/a-CoO heterojunction, which not only inhibits the aggregation of CoO but also promotes the formation of a-CoO.…”