Pectin-Functionalized Magnetic Nanoadsorbent for Efficient Mn²⁺ Removal and Reuse

Abstract

To address the environmental pollution caused by Mn²⁺-containing industrial wastewater, this study successfully synthesized a novel, efficient, and magnetically separable composite adsorbent by Immobilizing natural biomass pectin onto the surface of aminated core-shell magnetic nanoparticles (Fe₃O₄@SiO₂@NH₂). This study systematically investigated the adsorption behavior and desorption-regeneration performance of this material for Mn²⁺ in wastewater, aiming to provide theoretical and experimental basis for its practical application.

The composite magnetic nanocomposite adsorbent exhibited excellent Mn²⁺ adsorption performance under optimal conditions (dosage 10.0 mg, adsorption time 6.0 h, solution pH 6.0). In 20.0 mL of 100.0 mg/L Mn²⁺ solution, its removal efficiency reached 78.02%, and the equilibrium adsorption capacity was as high as 156.03 mg/g. Furthermore, the adsorbent demonstrated outstanding reusability, with a desorption efficiency of 90.04% in the first cycle, highlighting its great potential for practical applications.