Efficient removal of acetochlor pesticide from water using magnetic activated carbon: Adsorption performance, mechanism, and regeneration exploration

In this study, MnFe2O4 supported activated carbon magnetic adsorbent (MnFe2O4@AC) was successfully prepared by a simple one-pot solvothermal method and used for the adsorption and removal of acetochlor from aqueous media. Results showed that MnFe2O4@AC with a MnFe2O4/AC mass ratio of 1:2 was characterized by good magnetism and high acetochlor adsorption capacity over a wide ranging pH, ionic strength, and humic acid concentration in an aqueous solution. Acetochlorwas adsorbed on MnFe2O4@ACmainly by hydrogen bonding, pi-pi interactions, and pore-filling via film, intraparticle, and pore diffusion steps. Adsorption reaction generally approached an equilibrium after 10 h, with the adsorption capacity being ca. 226 mg g(-1) for 0.2 g L-1 adsorbent at 25 degrees C. Adsorbate (acetochlor) degradation and adsorbent regeneration were simultaneously achieved through heat-activated peroxymonosulfate (PMS) oxidation catalyzed by MnFe2O4 on the AC surface with >90% degradation efficiency at >= 9.6 mM PMS concentration at 70 degrees C within 12 h. However, the adsorption capacity of the regenerated adsorbent decreased by 50% of its original capacity. This needs to be addressed in future studies. MnFe2O4@AC adsorbent has the advantages of high adsorption capacity, good magnetism, and catalyzation, which are promising for adsorption, separation, and degradation for the effective removal and treatment of acetochlor as well as other organic contaminants in different types of waters. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

MnFe2O4@AC adsorbent, prepared using a one-pot solvothermal method, showed high acetochlor adsorption capacity and magnetism, making it effective for the removal of acetochlor from water under various conditions.