The leaching of toxic metals is still problematic for heterogeneous metal catalysts in activating peracetic acid (PAA). Herein, CoFe/U-ZrO was synthesized by loading CoFe onto the metal-organic framework (UiO-66) derived ZrO (U-ZrO) for PAA activation. The high porosity and specific surface area of UiO-66 enable efficient embedding and uniform dispersion of CoFe particles into pore channels. The supported material effectively activates PAA and significantly reduces Co leaching. CoFe/U-ZrO-PAA system shows a removal efficiency of sulfamethoxazole reaching 98.9% within 10 min with Co leaching concentrations as low as 0.005 mg/L (equivalent to 1.4% of CoFe-PAA system). Quenching experiments, probe experiments and electron paramagnetic resonance tests identify CHC(O)OO· as the dominant radical species. The CoFe/U-ZrO-PAA system maintains high activity in actual water bodies and can resist the interference of HPO, Cl, SO, NO and humic acid except for the inhibitory effect of HCO. The system also displays good stability and high degradability to different pollutants, maintaining consistently outstanding degradation efficiency in the flow-through experiment. Overall, the environmentally friendly, good efficiency, and high stability of the CoFe/U-ZrO-PAA system makes it potential for broad applications in wastewater treatment.
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