AI Article Synopsis
- This study explores the effective adsorption of the pesticide acephate using chitosan modified with varying amounts of magnetite through a simple co-precipitation method.
- The best results were achieved with a 1:1 chitosan to iron oxide ratio, achieving a 74.96% removal rate at pH 9.
- The process parameters such as pH, adsorbent dosage, and initial concentration significantly influenced the effectiveness, and the adsorption was confirmed to be exothermic and primarily chemical in nature, with high stability over multiple cycles.
Article Abstract
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 Fe 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∙FeO 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∙FeO showed no significant decrease after several cycles of adsorption/desorption, avoiding centrifugation-filtration steps.
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| http://dx.doi.org/10.1016/j.ijbiomac.2024.134992 | DOI Listing |
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