Adsorption-enhanced rapid catalytic degradation of ofloxacin by a CoS2@montmorillonite catalyst via peroxymonosulfate activation

Abstract

Besides adjusting the active sites, modulating the adsorption capacity and diffusion ability can realize the enrichment of the antibiotics and propel the catalytic degradation properties via the effective contact between active species and antibiotics. Herein, a series of CoS₂@MMT were prepared by a two-step synthesis. With the synergy of adsorption and catalysis, the obtained composites exhibit potential for the rapid and effective degradation of ofloxacin (OFL) as advanced oxidation process (AOP) catalysts by activating peroxymonosulfate (PMS). Among them, 10CoS₂@MMT can adsorb 41% of OFL and its total removal efficiency of OFL can reach 96.7% within 10 min. Based on the related tests, the composite can decompose OFL through both radical (˙OH, SO₄˙⁻, and O₂˙⁻) and non-radical pathways (¹O₂). The satisfactory catalytic properties and the stability of this kind of composite demonstrate their potential in the practical application of water decontamination.