Abstract Among different types of semiconductor photocatalysts, MoS 2 hybridized with graphitic carbon heterojunction has developed the most promising “celebrity” due to its static chemical properties, suitable band structure, and facile synthesis. Physiochemical and surface characterizations were revealed with XRD, SEM, TEM, DRS, and FTIR analysis. DRS evidenced the energy band gap tailoring from 2.62 eV for pure g-C 3 N 4 and 1.68 eV for MoS 2 to 2.12 eV for the hybridized heterojunction nanocomposite. Effective electron/hole pair separation, rise in redox species and great utilization of solar range because of band gap modifying leading to greater degradation efficacy of g-C 3 N 4 /MoS 2 heterojunction. The photocatalytic degradation with MoS 2 /g-C 3 N 4 heterojunction catalyst to remove methylene blue dye was enriched surprisingly which was much higher in comparison with g-C 3 N 4 . By carefully examining the stimulus aspects, a probable mechanism is suggested, assuming that the concurring influence of MoS 2 and g-C 3 N 4 , the lesser crystallite size, and more solubility in aquatic solution furnish the efficient e − - h + pairs separation and tremendous photocatalytic degradation activity. This work delivers a novel idea to improve the efficient MoS 2 /g-C 3 N 4 heterojunction for improved photocatalytic degradation in environmental refinement.
Abstract In this work, Nickel (Ni) and sulfur (S) codoped TiO 2 nanoparticles were prepared by a sol-gel technique. The as-prepared catalyst was characterized using X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), FT-Raman spectroscopy, scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectra (DRS) for investigating crystal structure, crystal phase, particle size and bandgap energy of these samples. The photocatalytic performances of all the prepared catalysts have been investigated for the degradation of methylene blue (MB) under visible light irradiation. It was noticed that Ni-S codoped TiO 2 (Ni-S/TiO 2 ) nanoparticles exhibited much higher photocatalytic activity compared with pure, Ni and S doped TiO 2 due to higher visible light absorption and probable decrease in the recombination of photo-generated charges. It was decided that the great visible light absorption was created for codoped TiO 2 by the formation of impurity energy states near both the edges of the collection, which works as trapping sites for both the photogenerated charges to decrease the recombination process.
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