TMDC based nanocomposite as efficient photocatalyst

Sanni Kapatel and Dr. C. K. Sumesh

P. D. Patel University of Applied Sciences, Charotar university of science and technology - CHARUSAT, Changa 388 421

Abstract: In this work, we report the creation of binary semiconductor nanocomposite (NC) comprising spherical ZnO nanoparticles stacked with two-dimensional (2D) MoS2 nanosheets, utilizing a facile microwave assisted synthesis technique. The fabricated product was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy instrument (HR-TEM), Scanning electron microscopy (SEM), Raman spectroscopy (RS), Energy-dispersive X-ray spectroscopy (EDAX), Inductively coupled plasma (ICP) analysis and Fourier transform infrared spectroscopy (FTIR) to distinguish the structure and morphology of arranged NC. Ultraviolet-Visible (UV-Vis) spectroscopy was used to understand the optical properties of MoS2.ZnO NC. Optical transmission spectra gave a distinct red shift in the band gap of ZnO after making composition with MoS2 nanosheets which eventually shows higher retention of visible light. This occurs due to effective separation of photogenerated charge carriers and rapid charge transfer to reactions sites of conduction band potentials of both ZnO and MoS2 both. We plot that MoS2.ZnO NC has a band gap of 2.73 eV which is fundamentally a long way from the band gap of ZnO (~3.3eV). The outcomes recommended the effective fading out of methylene blue (MB) (more than 95%) in 1 hour on the illumination of visible light. Besides, the association of MoS2 prevents photo-corrosion of the ZnO bringing about upgraded photostability of the catalyst during the reaction. Moreover, we presented a recyclability test of the photocatalyst for five subsequent times to get the efficient dye degradation. A straightforward, easy and powerful technique to build up binary NC (heterostructure) that add to the change of visible light determined photocatalytic execution is proposed.

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