Efficient removal of organophosphate insecticide employing magnetic chitosan-derivatives

• Published in: International journal of biological macromolecules Vol. 279; no. Pt 1; p. 134992
• Main Authors: Bouzidi, Mohamed, Alwadai, Norah, Al Huwayz, Maryam, Tronco, Rafael, de Oliveira, Miguel, da Rosa Salles, Theodoro, Saidani, Taoufik, Nunes, Franciane Batista, Westermann, Bernhard, Fagan, Solange Binotto, Ramos, Claudete Gindri, Silva, Luis Felipe Oliveira, Dotto, Guilherme Luiz, Rhoden, Cristiano Rodrigo Bohn
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.11.2024
• Subjects: Emergent pollutants; Magnetite; Water remediation; Water remediation; Magnetite; Emergent pollutants
• ISSN: 0141-8130; 1879-0003; 1879-0003
• DOI: 10.1016/j.ijbiomac.2024.134992

Herein, this work reports an efficient acephate adsorption using chitosan (CS) incorporating varying amounts of magnetite. A co-precipitation methodology was employed for the functionalization of chitosan with iron nanoparticles, using Fe2+ as the sole iron source and with a low energy requirement. The adsorbents were characterized by FTIR, XRD, VSM, and nitrogen porosimetry techniques. The CS∙Fe3O4 1:1 NPs showed the highest acephate removal percentage (74.96 %) at pH 9 and ambient temperatures. The adsorption process exhibited high dependencies on pH, adsorbent dosage, initial concentration of adsorbate, and ionic strength. Sips and pseudo-second-order kinetics models best adjusted the experimental data, suggesting that the process occurs on a heterogeneous surface. Thermodynamic evaluation showed that the adsorption was exothermic, favorable, and predominately through chemical interactions. Finally, the CS∙Fe3O4 showed no significant decrease after several cycles of adsorption/desorption, avoiding centrifugation-filtration steps.