Recyclable photocatalysts for treating the organically polluted water, occupies significant research space globally, in order to address the water security problems. Here, we report a novel, efficient and recyclable ZnS nanoparticles (NPs) ‐ WO3 nanosheet hybrid photocatalysts prepared with different mass ratios (20 & 40 wt. %) of ZnS NPs on WO3 nanosheets. The formation of hybrid photocatalysts was investigated by various analytical techniques. The photocatalytic performances of all the as prepared catalysts were evaluated by the photodegradation of Methylene Blue (MB) dye under UV‐Vis light irradiation. Amongst, 20 wt. % ZnS ‐ WO3 nanosheet hybrid showed higher photocatalytic degradation activity than the other samples. The increased absorption of light in the visible region and simultaneous suppression of carrier recombination effected the enhancement in the photocatalytic degradation efficiency. A possible reaction mechanism for improvement of photocatalytic activity of ZnS ‐ WO3 nanosheet hybrid has been proposed.
Semiconductor hybrids based photocatalytic reaction is one of the prominent methods to treat wastewater, containing the organic pollutants. In the present work, we report the development of ZnS QDs-LDH hybrid structure for the photocatalytic treatment of methylene blue (MB) dye. The as-synthesized ZnS QDs-LDH hybrid structure was characterized by XRD, FESEM, HRTEM, EDX, XPS, and FTIR to analyze the formation, morphology and chemical structure. The UV-Vis DRS was used to investigate the optical absorption characteristics of the ZnS QDs-LDH hybrid. The photocatalytic performance of the asprepared samples was investigated against the methylene blue dye molecule under UV-Vis light irradiation. The scavenging experiments were carried out in order to probe the radical formation by using EDTA, benzoquinone, and 2-proponal. The cycling experiments were performed to check the stability of the ZnS QDs-LDH hybrid photocatalyst after repeated photodegradation experiments.
We examine the photocatalytic activity (PCA) of ZnO/graphitic carbon nitride g-C3N4 (g-CN) composite material for methylene blue (MB) degradation under visible-light irradiation (VLI). The polymeric g-CN materials were fabricated by the pyrolysis of urea and thiourea. More importantly, ZnO/g-CN nanostructured composites were fabricated by adding the different mounts (60, 65, 70, and 75 wt.%) of g-CN into ZnO via the simple hydrothermal process. Among fabricated composites, the 75% ZnO/g-CN nanocomposites displayed a superior PCA for MB degradation, which were ~three-fold an enhancement over the pure ZnO nanoparticles. The fabricated materials have been evaluated by X-ray diffraction (XRD), UV-Vis, Fourier transform infrared (FT-IR) spectroscopy, and electron microscopy. More importantly, the photodegradation of MB could get 98% in ZnO/g-CN could be credited to efficient separation of photo-induced charge carriers between ZnO and g-CN. Also, the recycling efficiency of the as-prepared composites was studied for multiple cycles, which shows that the photocatalysts are stable and suitable to carry out photocatalytic degradation in the logistic mode. Additionally, the probable photocatalytic mechanism has also discussed. The synthetic procedure of ZnO/g-CN based materials can be used in numerous fields such as environmental and in energy storage applications.
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