In-situ synthesis of CdS/g-C3N4 hybrid nanocomposites with enhanced visible photocatalytic activity

Abstract

A novel and simple in situ synthetic strategy was used to fabricate CdS/g-C 3 N 4 hybrid nanocomposite catalysts with visible-light-driven photocatalytic activity from cadmium-containing carbon nitride compounds. X-ray diffraction measurements, high-resolution transmission electron microscopy images, and Fourier transform infrared spectra showed heterojunctions with a close interface between the g-C 3 N 4 and the CdS nanoparticles and nanorods in the composite. Ultraviolet visible diffuse reflectance spectra exhibited a red shift that further presented the CdS in the polymer g-C 3 N 4 skeleton, which allowed the efficient utilization of the solar spectrum for creating photogenerated electrons and holes. The photoluminescence spectra of the nanocomposites suggested charge transfer from g-C 3 N 4 to CdS. The photocurrent intensity of hybrid nanocomposites was 2.3 times than that of pure g-C 3 N 4 sample, and photocatalytic activity for the photodegradation of methyl orange was 2.5 times, and hydrogen evolution reaction was 2.8 times. Enhanced photocatalytic activity and photocurrent for the CdS/g-C 3 N 4 hybrid nanocomposites were achieved.

Photocatalytic Performance and Degradation Pathway of Rhodamine B with TS-1/C3N4 Composite under Visible Light

“…Although C 3 N 4 presents considerable photocatalytic performance, it is limited by its high recombination of photoexcited electron-hole pairs and low specific surface area. Many strategies have been employed to enhance its photocatalytic activity, such as doping nonmetal elements (B, S, F) [27][28][29], loading graphene and noble metal Pt [30,31] or transition-metal oxide (NiO) [32], combining other semiconductor photocatalysts (SiC [33], CdS [34], TiO 2 [35]) and fabricating mesoporous C 3 N 4 [36]. Due to the high specific surface area of TS-1 and good photocatalytic performance of C 3 N 4 , it is interesting to investigate the photocatalytic performance of TS-1/C 3 N 4 composites under visible light.…”

CdS nanospheres hybridized with graphitic C3N4 for effective photocatalytic hydrogen generation under visible light irradiation

“…Taking 5CSCN (Figure c) as an example, CdS nanospheres were relatively uniformly dispersed on the surface of g‐C 3 N 4 . Moreover, an interplanar spacing of 0.357 nm was observed from the high‐resolution TEM image of 5CSCN in Figure d, which was attributed to the (100) plane of CdS nanospheres and further demonstrated the successful loading of CdS nanospheres on the surface of g‐C 3 N 4 .…”

Facile synthesis of interlocking g-C3N4/CdS photoanode for stable photoelectrochemical hydrogen production

“…The XPS peaks for Cd 3d appear at 404.9 eV (3d 5/2 ) and 411.7 eV (3d 3/2 ), which are attributed to Cd 2+ ions in CdS (Fig. 2E)[30]. The S 2p peaks at 161.5 eV (S 2 p3/2 ) and 162.6 eV (S 2 P1/2 ) shown inFig.…”

“…crystal planes of cubic crystalline structure of CdS (JCPDS: 41-1049)[30], respectively. After loading CdS nanoparticles, the peaks of FTO decrease and the peak of g-C 3 N 4 even disappears because CdS attached on the FTO/g-C 3 N 4 , which blocks the detection ability of X-ray to FTO and g-C 3 N 4 .…”