Ferric ion modified nano-MOF-5 synthesized by a direct mixing approach: A highly efficient adsorbent for methylene blue dye

In this study, the adsorption of Methylene Blue (MB) dye was studied with modied Fe-MOF-5 and MOF-5 synthesized at room temperature by a direct mixing approach. The morphological and physicochemical properties of the prepared catalysts were characterized by Scanning Electron Microscopy (SEM), X-Ray Diraction (XRD), and Fourier transform infrared spectroscopy (FT-IR). The removal rate of Fe-MOF-5 was considerably greater than that of MOF-5, showing that the adsorption performance of MOF-5 can improve through necessary modications. The in uence of various parameters on the adsorption interaction of the prepared compounds was considered in pH value, contact time, temperature, adsorbent dosage, and concentration of MB. Consequently, the adsorption kinetics, thermodynamics, and isotherms were explored consistently. To predict the adsorption isotherms and specify the characteristic parameters for the process design, four isotherm models, such as Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich (D-R), were applied. The experimental isotherm data were found to t the Langmuir model properly. Additionally, adsorption kinetic data were tested using pseudo-rst-order, pseudo-second-order, and Elovich models and were found to t pseudo-second-order model. The thermodynamic parameters illustrated that the adsorption was a spontaneous and endothermic process