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Advanced oxidation processes (AOPs) are effective ways to degrade refractory organic contaminants, relying on the generation of inorganic radicals (e.g., • OH and SO 4  •- ). Herein, a novel AOP with organic radicals (R-O • ) was reported to degrade contaminants. Lanthanum cobaltite perovskite (LaCoO 3 ) was used to activate peracetic acid (PAA) for organic radical generation to degrade sulfamethoxazole (SMX). The results show that LaCoO 3 exhibited an excellent performance on PAA activation and SMX degradation at neutral pH, with low cobalt leaching. Meanwhile, LaCoO 3 also showed an excellent reusability during PAA activation. In-depth investigation confirmed CH 3 C(O)O • and CH 3 C(O)OO • as the key reactive species for SMX degradation in LaCoO 3 /PAA system. The presence of Cl - (1-100 mM) slightly inhibited the degradation of SMX in the LaCoO 3 /PAA system, whereas the addition of HCO 3  - (0.1-1 mM) and humic aid (1-10 mg/L) could significantly inhibit SMX degradation. This work highlights the generation of organic radicals via the heterogeneous activation of PAA and thus provides a promising way to destruct contaminants in wastewater treatment.

molecules/molecules online/molecules annual

Activation of Peracetic Acid with Lanthanum Cobaltite Perovskite for Sulfamethoxazole Degradation under a Neutral pH: The Contribution of Organic Radicals