Highly Active Co is Injected into the PrSmMnO3 Parent Structure to Promote the 1O2 Pathway to Efficiently Degrade Residual Chloroquine Phosphate in Wastewater

Abstract

After the outbreak of COVID-19, the severe threat to the entire biological environment caused by the extensive use of chloroquine phosphate (CQ) continues. In this paper, a new sol–gel method was used to inject highly active Co into the PrSmMnO₃ matrix structure to prepare a novel perovskite composite catalyst PrSmCo_0.8Mn_0.2O₃ with stable properties, and was used to efficiently activate monopersulfate (PMS) to produce high concentration of ¹O₂ and degrade CQ. The CQ degradation rate of 40 mg L⁻¹ within 80 min was 97.3%, and excellent performance was maintained after 5 cycles. The fixed variable method found that the PrSmCo_0.8Mn_0.2O₃/PMS system still has high efficiency and adaptability in complex water bodies. Through quenching experiments and electron paramagnetic resonance spectroscopy (EPR), we explored the PrSmCo_0.8Mn_0.2O₃/PMS system. PMS is efficiently adsorbed on highly active Co, forming a high-entropy mixed interface, which promotes the decomposition of PMS and generates a large amount of ⋅O₂⁻ radicals. At the same time, Co–Mn synergistically and efficiently utilizes excess electrons and ⋅O₂⁻ radicals in the solution to produce high concentrations of ¹O₂ through disproportionation reactions, promoting the degradation of CQ. It provides new insights into the application of perovskite oxides in medical wastewater treatment.

Graphical Abstract