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<p>This research examines the removal of the fungicide metalaxyl from water using chitosan-carbon nanoparticle composites (Cs/CaCO₃-NC). The Cs/CaCO₃-NC composite was synthesized by integrating chitosan, a biodegradable polymer, with calcium carbonate nanoparticles (CaCO₃-NPs), enhancing its structural stability and adsorption capabilities. Characterization using FTIR, XRD, and TEM confirmed the synergistic integration of components, providing a high surface area and functional group availability. Adsorption experiments demonstrated that Cs/CaCO₃-NC exhibited superior performance compared to its individual components, and its adsorption capacity was competitive with values reported in the literature for conventional adsorbents such as activated carbon and biochar. Kinetic analysis demonstrated that metalaxyl adsorption conforms to a pseudo-second-order model, implying that chemisorption is the rate-limiting step. Additionally, the equilibrium data aligned with the Langmuir isotherm, indicating that adsorption occurs as a homogeneous monolayer on the adsorbent surface. The composite exhibited high removal efficiency over a range of concentrations and environmental parameters, highlighting its promise as an effective and environmentally sustainable material for mitigating pesticide pollution in water systems. This study bridges the gap in pesticide remediation using eco-friendly materials, offering insights into scalable applications for environmental cleanup.</p>

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Efficient removal of metalaxyl from water using chitosan-CaCO3 nanoparticle composites: kinetics, isotherms, and environmental implications

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Ayman N. Saber,
  • Abd El-Salam Fayez,
  • Tamer M. Abd El-Aziz El-Mergawy,
  • Ridha Djellabi

摘要

This research examines the removal of the fungicide metalaxyl from water using chitosan-carbon nanoparticle composites (Cs/CaCO₃-NC). The Cs/CaCO₃-NC composite was synthesized by integrating chitosan, a biodegradable polymer, with calcium carbonate nanoparticles (CaCO₃-NPs), enhancing its structural stability and adsorption capabilities. Characterization using FTIR, XRD, and TEM confirmed the synergistic integration of components, providing a high surface area and functional group availability. Adsorption experiments demonstrated that Cs/CaCO₃-NC exhibited superior performance compared to its individual components, and its adsorption capacity was competitive with values reported in the literature for conventional adsorbents such as activated carbon and biochar. Kinetic analysis demonstrated that metalaxyl adsorption conforms to a pseudo-second-order model, implying that chemisorption is the rate-limiting step. Additionally, the equilibrium data aligned with the Langmuir isotherm, indicating that adsorption occurs as a homogeneous monolayer on the adsorbent surface. The composite exhibited high removal efficiency over a range of concentrations and environmental parameters, highlighting its promise as an effective and environmentally sustainable material for mitigating pesticide pollution in water systems. This study bridges the gap in pesticide remediation using eco-friendly materials, offering insights into scalable applications for environmental cleanup.