فهرست نشریات علمی دسترسی آزاد ایران

This research presents the development of an innovative MIL-100(Cr)@Fe₂O₃ composite, designed to effectively eliminate Methylene Blue (MB) from wastewater through a combined mechanism of adsorption and photocatalysis. The material leverages the large specific surface area and strong adsorption properties of amine-functionalized MIL-100(Cr), a Metal-Organic Framework (MOF), in conjunction with the photocatalytic functionality of Fe₂O₃ nanoparticles. Structural and morphological characterization was carried out using FT-IR, SEM, BET, and UV-Vis techniques, verifying the composite's successful synthesis and surface engineering. BET results confirmed the presence of mesopores ranging from 2 to 50 nm, which are ideal for adsorption and catalytic reactions. A factorial Design of Experiments (DoE) methodology was employed to systematically investigate the influence of crucial operational parameters—MOF dose (0.02–0.06 g/L), initial MB concentration (30–50 mg/L), contact time (30–90 min), and pH level (6–10)—on removal efficiency. Under optimized conditions of 0.06 g/L MOF, 30 mg/L MB, pH 10, and 90 minutes of reaction, complete dye removal (100%) was achieved. Kinetic modeling revealed that the adsorption behavior followed a pseudo-second-order kinetic model (R² = 0.9467, k₂ = 0.085 min⁻¹), suggesting a chemisorption-driven process with an adsorption capacity of 51.2 mg/g. The composite maintained high performance in real wastewater samples, with removal efficiency exceeding 85%, and demonstrated acceptable reusability over six successive cycles, although some decline in activity occurred afterward. These findings underscore the material's potential as a robust, efficient, and sustainable candidate for practical dye removal applications in wastewater treatment systems, optimized through statistical design.