Fe₃O₄@Co₃S₄ Nanocatalyst: Enhanced Activation of Peroxymonosulfate for Acetaminophen Degradation

Abstract

How to accelerate the electron transfer to promote the circulating efficiency of Fe[Formula: see text]/Fe[Formula: see text] is a key problem to be solved, so that magnetic particles can activate peroxymonosulfate well to efficiently degrade acetaminophen (ACE). Herein, a Fe 3 O 4 @Co 3 S 4 catalyst was prepared by modifying Co 3 S 4 nanosheets on the surface of magnetic Fe 3 O 4 particles. The Co[Formula: see text] in the modified layer Co 3 S 4 accelerates the rate of electron transfer between Fe[Formula: see text] and Fe[Formula: see text], thus promoting the circulating efficiency of Fe[Formula: see text]/Fe[Formula: see text]. Fe 3 O 4 @Co 3 S 4 /PMS system can degrade over 95% of ACE within 5[Formula: see text]min. Quenching experiment and ESR tests prove that non-radical 1 O 2 and [Formula: see text] played predominant roles in the advanced oxidation process. And after six cycles, the degradation rate could still be higher than 50%.