Fabrication of Ternary MoS2/CdS/Bi2S3-Based Nano Composites for Photocatalytic Dye Degradation

Abstract

The synthesis and design of low-cost visible-light-active catalysts for the photodegradation of organic dyes have been regarded as an efficient way to use solar energy in addressing environmental issues. We report the fabrication of MoS2/CdS nanoparticles functionalized with Bi2S3 nanoflakes. The ternary composites of “MoS2/CdS/Bi2S3” were synthesized in situ by a hydrothermal method at different temperatures. The changes in structural, optical, and morphological properties of the synthesized CdS/MoS2/Bi2S3 were explored. The effects of Bi2S3 on CdS/MoS2 were thoroughly studied by performing an X-ray diffractometer (XRD), a scanning electron microscope (SEM), an ultra-violet–visible spectrometer (Uv–vis), and Fourier transform infrared spectroscopic (FT-IR) studies of the nanoparticles. XRD confirms the cubical crystal structure of the nanoparticles. SEM studies possess the modulation in the surface morphology with the tenability in volume ratios of “MoS2/CdS/Bi2S3” composites. It was observed that the bandgaps calculated using absorption measurements could be manipulated from 2.40 eV to 0.97 eV with varying Bi2S3 in the MoS2/CdS nanostructures. FT-IR confirmed the synthesis of “MoS2/CdS/Bi2S3” nanoparticles. On allowing the visible light to fall for 120 min, it was observed that “MoS2/CdS/Bi2S3” degrades the methylene blue up to 90%. The calculated results of “MoS2/CdS/Bi2S3” suggest that the synthesized material could be a strong candidate for photodegradation applications. This research work explains the synthesis of MoS2/CdS/Bi2S3-based nanocomposites for the degradation of dye using a photocatalytic process. The final results show that this catalyst effectively degrades the dye.

Covalently Linking Reduced Graphene Oxide Facilitated Electrodeposition of MoS2 on Silicon Pyramidal Photocathode To Enhance Hydrogen Evolution

“…As indicated in Figure S3a, MoS 2 shows multiple characteristic peaks, and the stretching vibration peaks near 1045 and 817 cm –1 correspond to the vibration mode of the S–Mo–S chain and S–Mo–S layer, respectively . In addition, the Mo–S–Mo vibration peaks are located near 670 and 486 cm –1 . The result of Raman spectra confirms the successful loading of rGO and MoS 2 multilayers .…”

“…Since the peak signal of the base Si and rGO is too strong in the Raman spectra, it is difficult to capture the peak signal of MoS 2 loaded on it, so the infrared spectrum of Si/rGO/MoS 2 is provided to support the successful loading of MoS 2 . As indicated in Figure S3a, MoS 2 shows multiple characteristic peaks, and the stretching vibration peaks near 1045 and 817 cm –1 correspond to the vibration mode of the S–Mo–S chain and S–Mo–S layer, respectively . In addition, the Mo–S–Mo vibration peaks are located near 670 and 486 cm –1 .…”