Application of MnOx-CeOx/BC in electrocatalyzation-ozonation coupled treatment of landfill leachate

Le résumé fourni par la source

The biochar catalyst loaded with MnOx-CeOx (MnOx-CeOx/BC) was prepared by crosslinking-carbonization method. The structure of the catalyst was characterized, and the mechanism and degradation effects of COD, UV254 and TOC in the biochemical effluent of landfill leachate under the electrocatalytic-ozone coupling system were investigated. The synthesized MnOx-CeOx/BC catalyst exhibited abundant oxygen vacancy formation during the Ce4+ to Ce3+ transition. The Mn-Ce bimetallic synergy further facilitated efficient electron transfer, thereby significantly improved catalytic performance. Moreover, in contrast to the pristine BC support, the catalyst displayed a well-defined rod-like morphology with an enhanced specific surface area and a highly porous structure, which collectively provided ample active sites for efficient pollutant degradation. When the ozone concentration was 8.1 mg/L, the dosage of MnOx-CeOx/BC was 60 g/L, the current density was 20 mA/cm2, and the initial pH was 7, MnOx-CeOx/BC exhibited the best catalytic degradation performance, with the removal rates of COD, UV254, and TOC in the biochemical effluent of landfill leachate reaching 86.5%, 92.9%, and 80% within 60 min, respectively. After six consecutive experiments, the removal rates of COD and UV254 by MnOx-CeOx/BC remained above 70% and 80%, respectively. Additionally, the free radical quenching experiments demonstrated that ·OH was the main active substance during the degradation process of landfill leachate.

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