ZrO2 supported perovskite activation of peroxymonosulfate for sulfamethoxazole removal from aqueous solution

Abstract

In this study, A- and B-site doped perovskite La0.5Sr0.5Co0.8Ni0.2O3 （LSCN) was prepared by sol-gel method. On this basis, ZrO2 supported LSCN used to maintain high catalytic activity while inhibit the leaching of toxic Co ions. Compared with the non-doped LaCoO3, the ZrO2@La0.5Sr0.5Co0.8Ni0.2O3 (Z@LSCN82)/PMS system could almost completely degrade SMX in 30 min. In addition, the leaching amount of Co ions was only 0.303 mg L−1. Free radical quenching experiments and electron paramagnetic resonance experiments proved that active species SO4•−, •OH and 1O2 existed in the Z@LSCN82/PMS system, and SO4•− played a major role. Besides, the catalyst had high efficiency for SMX degradation in a wide pH range. In addition, co-existing anions in water such as HPO4− and Cl− also showed slight inhibition of the system. It was indicated that the Z@LSCN82/PMS system had huge potential applications for practical wastewater treatment.