(Fe0.67Mn0.33)OOH riched in oxygen vacancies facilitated the PMS activation of modified EMR for refractory foaming agent removal from mineral processing wastewater

A novel ternary composite catalyst (FeOOH/Fe 2 O 3 /(Fe 0.67 Mn 0.33 )OOH ) directly prepared from electrolytic manganese residue was applied for terpineol degradation in this study. The reaction system could remove 76.8% of chemical oxygen demand (COD) from simulated water containing terpineol (100 mg/L), while the degradation process could be accelerated under alkaline condition (84.6% at pH 9.0). The degradation performances of Fe 2 O 3 , FeOOH and (Fe 0.67 Mn 0.33 )OOH indicated that the in-situ formed (Fe 0.67 Mn 0.33 )OOH riched in oxygen vacancies (O V ) could promote the PMS activation activity of catalyst mainly ascribed by enhancing interfacial electron transfer . The · OH $\text{OH}$ was the primary active radical, the production of which was favored by the metal−OH. This ternary composite catalyst had anti-jamming ability toward most common ions. Further, this system also displayed an outstanding degradation ability for actual mineral processing wastewater (93.2% COD removal). The developed system expanded the horizon for the high-value utilization of metallurgical slag and the treatment of refractory organic pollutants in mineral processing wastewater.