High Resolution Image Download MS PowerPoint Slide The remediation of dye-contaminated wastewater is increasingly important due to the growing global dye industry, particularly in developing countries. In this context, porous and amorphous modified metal–organic frameworks have gained significant attention for their potential to remove methylene blue (MB) dye. However, the current challenge is to achieve a delicate balance between maintaining structural stability and ensuring high porosity while deliberately inducing disorder. To address this, an amorphous Zn-doped Fe-MOF, specifically FZM-10:2, was synthesized using a modified hydrothermal method, which involved adjusting the iron-to-zinc ratio to enhance MB removal. The maximum adsorption capacity for MB was determined to be 208.3 mg g –1 at an Fe/Zn ratio of 10:2 (FZM-10:2). Consequently, the Langmuir isotherm model was used to explain adsorption equilibrium, while the pseudo-second-order model was used to investigate adsorption kinetics. Thermodynamic analysis revealed a positive enthalpy change (+107.6 kJ mol –1 ), indicating that the process is endothermic and dominated by chemisorption. Negative Gibbs free energy (ΔG°) values confirmed the spontaneous nature of adsorption. The FZM-10:2 adsorbent exhibited excellent selectivity and stability toward MB in mixed-dye systems. Furthermore, an MB removal efficiency of 98% was achieved in wastewater at pH 8, suggesting a scalable adsorption method.
Belayneh et al. (Wed,) studied this question.
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