Enhanced Photocatalytic Degradation of Brilliant Green and Indigo Carmine Dyes Using Bismuth Oxychloride‐molybdenum Disulfide Hybrid Nanocomposites Under UV Light Irradiation

ABSTRACT In this present study, the Bismuth Oxychloride‐Molybdenum Disulfide nanocomposite was successfully synthesized via the hydrothermal synthesis method. After hydrothermal synthesis, the obtained BiOCl‐MoS 2 nanocomposite was washed, dried, and calcined at 500°C to remove residual impurities and enhance crystallinity and phase purity, and characterized by various confirmation techniques, which include Field Emission Scanning Electron Microscopy, X‐ray Diffraction, Fourier Transform Infrared Spectroscopy and Ultraviolet‐Visible Spectroscopy. The result of Field Emission Scanning Electron Microscopy micrographs exhibits a well‐dispersed and uniform spherical structure with a particle size range of 59.52 ± 1.73 nm. For X‐ray Diffraction analysis confirmed the crystalline structure of the BiOCl‐MoS 2 nanocomposite by observing major diffraction peaks at 2θ angles 14.48°, 34.77°,39.14°, 48.20°, 58.89°, and 66.47°, which correspond to the (002), (100), (103, 105, 110), and (114) planes of Bismuth Oxychloride‐Molybdenum Disulfide. As a result, Fourier Transform Infrared Spectroscopy verified the presence of both Bismuth Oxychloride‐Molybdenum Disulfide phases (Bi‐O and Bi‐Cl stretching vibrations at 771 cm − 1 and 1129 cm − 1 , respectively, along with Mo‐S and S‐S vibrations at 523 cm − 1 and 493 cm − 1 .The Ultraviolet‐Visible Spectroscopy analysis observed the strong absorption shift towards longer wavelengths, which enhances the visible light utilization and the plotted bandgap of BiOCl was estimated at 3.0 eV, which is reduced to 1.84 eV in the BiOCl‐MoS 2 , confirming the efficient charge transfer between the two phases. The light absorption and charge carrier separation were enhanced by a narrowed bandgap, through this process, the photocatalytic efficiency was boosted. Degradation study of Brilliant Green and Indigo Carmine dye achieved 86.03% and 87.10% efficiency by the nanocomposite under UV light. These findings emphasize the novelty of the BiOCl‐MoS 2 nanocomposite, which has shown high photocatalytic activity, an eco‐friendly approach to synthesize it, and is potentially suited for wastewater treatment applications.