Methylene Blue Dye Removal in Aqueous Solution Using Synthesized MnCuO₂ Nanocomposite: Thermodynamic and Kinetic Studies

This work reports the preparation of manganese and cupper Hybrid Oxide nanocomposites by a green synthesis method. The material was characterized by X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), and Transmission Electron Microscopy (TEM). Brunauer–Emmett–Teller (BET) surface area measurements The synthesized materials were examined for their dye adsorption performance through the removal of basic methylene blue (MB) as a model compound from water. Various adsorption parameters were investigated, such as adsorbent dosage, contact time, solution pH, and temperature. Mesoporous MnCuO2 nanocomposites displayed satisfactory results, with rapid adsorption occurring and the use of low-concentration sorbents and contact times [60] within 60 minutes. Analysis of the adsorption behavior showed a good fit with the Freundlich (R2 = 0.9761, P<0.05) and Temkin isotherms, and also with a pseudo-second-order kinetic model (R2 = 0.9998). This was followed by detailed thermodynamic studies that corroborated these findings. This study will provide new insights into the utilization of copper–manganese dioxide nanocomposites as a promising candidate for the highly efficient removal of methylene blue dye.