فهرست نشریات علمی دسترسی آزاد ایران

Dyes are hazardous contaminants present in industrial effluents, and developing efficient, low-cost, and sustainable methods for their removal remains a pressing challenge. In this study, ethylenediaminetetraacetic acid (EDTA)-modified montmorillonite (Mt), as an economical and accessible adsorbent, was synthesized for the removal of rhodamine B (Rh B) from aqueous solutions. The adsorbent characteristics were identified by Field Emission Scanning Electron Microscopy (FE-SEM), Energy-Dispersive X-ray (EDX spectroscopy, Transmission Electron Microscopy (TEM), Fourier Transform InfraRed (FT-IR) spectroscopy, and X-Ray Diffraction (XRD). To optimize factors such as pH, adsorbent dosage, initial concentration, and shaking rate, a Central Composite Design (CCD) was applied. The CCD analysis obtained the optimum conditions at a pH of 6, an adsorbent dosage of 0.032 g, an initial concentration of 10 mg/L, and a shaking rate of 400 rpm for the maximum removal efficiency (97.86 %). Three adsorption isotherms (Langmuir, Freundlich, and Temkin) were considered for the adsorption procedure, and the Freundlich model with R2=0.9625 showed the best description for adsorption. The maximum adsorption capacity (qmax) was estimated as 147.05 mg/g. The adsorption kinetics outcomes were aligned well with a pseudo-second-order model with R2 of 0.9933. The results obtained from thermodynamic parameters proved that the adsorption process was spontaneous and exothermic. Beyond demonstrating excellent performance, this work highlights the novelty of EDTA-functionalized Mt as a promising alternative to conventional adsorbents. Owing to its low cost, high efficiency, and environmentally friendly nature, the Mt-EDTA nanocomposite holds great potential for large-scale wastewater treatment applications in dye-polluted industrial sectors.