Study on preparation, photocatalytic performance and degradation mechanism of polymeric carbon nitride/Pt/nano-spherical MoS2 composite

In this paper, a visible light-driven polymeric carbon nitride (PCN)/(Pt)/nano-spherical MoS2 photocatalysts was prepared using a self-assembly method. The structure of photocatalysts was explored by FT-IR, XPS, XRD, BET, SEM and TEM. Meanwhile, the energy band structure and electron hole separation efficiency were also analyzed by UV-Vis and PL spectra. In addition, the photocatalytic performance of photocatalysts were tested by photocatalytic degradation of Rhodamine B and photocatalytic hydrogen evolution. The results showed that PCN/ 2.0%MoS2 showed the best photocatalytic performance, and the degradation rate of Rhodamine B could reach 98.39% within 150 min. Besides, the introduction of Pt nanoparticles significantly improved the photocatalytic activity. The degradation rate of Rhodamine B reached 100% within 150 min, and the rate of photocatalytic hydrogen production of PCN/Pt/MoS2 system was increased by 21.3% over the PCN/2.0%MoS2 system. The separation mechanism of electron and hole is Z-scheme mechanism and the main active substances for photo catalytic degradation were .O-2(-) and h(+).

Automated summary

This paper presents the preparation and characterization of a visible light-driven polymeric carbon nitride (PCN)/(Pt)/nano-spherical MoS2 photocatalyst. The structure and energy band structure of the photocatalyst were investigated, and the photocatalytic performance was evaluated for the degradation of Rhodamine B and hydrogen evolution. The introduction of Pt nanoparticles greatly enhanced the photocatalytic activity, leading to higher degradation rate and increased hydrogen production rate compared to the PCN/2.0%MoS2 system.