Application of Silica-Coated Magnetic Nanoparticles in the Treatment of Dye-Contaminated Water

الملخص

The treatment of wastewater contaminated with industrial dyes remains a significant environmental challenge due to the high chemical stability and low biodegradability of these pollutants. This study aimed to synthesize and evaluate silica-coated magnetic nanoparticles functionalized with amino groups for the efficient removal of Chicago Sky Blue dye from aqueous media. The hybrid nanomaterial, Fe₃O₄@SiO₂–Epoxy–NH₂, was successfully prepared via the sol–gel method and characterized using Fourier Transform Infrared Spectroscopy (FTIR) and Field Emission Scanning Electron Microscopy (FESEM). The influence of key operational parameters, including solution pH, adsorbent dosage, contact time, and initial dye concentration, was systematically investigated. The highest removal efficiency (~90%) was achieved under optimized conditions of pH 5, adsorbent dosage of 40 mg, contact time of 40 min, and initial dye concentration of 40 mg/L. The enhanced adsorption performance is attributed to the synergistic effect of the magnetic core, silica shell, and surface amino-functionalized active sites, which promote strong electrostatic interactions and hydrogen bonding with dye molecules. These findings demonstrate that the synthesized hybrid material is a promising and reusable adsorbent for the efficient treatment of dye-contaminated industrial wastewater.