Fabrication and properties of magnetic nanocomposites for cationic dye adsorption

This study explores the synthesis and application of a pectin-coated magnetic nanocomposites (MNCs) as an efficient adsorbent for the removal of cationic dyes, specifically methylene blue (MB). Magnetic nanoparticles were synthesized using a straightforward coprecipitation method and coated with pectin to form MNCs. The adsorption performance of the MNCs was systematically evaluated under different pH, contact time, and initial dye concentration. Adsorption test results showed that MNCs is well-described by the pseudo-second-order kinetic and Langmuir isotherm model, with a maximum adsorption capacity of q_m = 63.27 mg/g toward MB molecules. Additionally, MNCs showed exceptional efficiency in the removal of MB, achieving a removal rate exceeding 95 %. Plus, recycling removal efficiency remains high throughout the experiment, with over 88 % of the adsorption capacity retained after three cycles. These findings suggest that pectin-coated magnetic nanocomposites are a sustainable and effective material for the remediation of cationic dyes in wastewater treatment systems.