Enhancement of Fenton-like degradation performance of organic dyes by constructing Ni substitution at the B-site for LaCoxNi1−xO3 perovskite catalysts

Abstract

Perovskite-type catalysts show good prospects in the field of pollutant degradation. Bimetallic doping can regulate the structure of the perovskite and improve its performance. A series of Ni-substituted LaCo_xNi_1−xO₃ (x = 1, 0.75, 0.5, 0.25, and 0) catalysts were prepared to degrade reactive brilliant red X-3B by activating H₂O₂. SEM and XRD analyses revealed that Ni was successfully incorporated into the LaCoO₃ material, and the B-site substituted material exhibited an increased number of active sites. The experimental results showed that the Ni substitution at the B-site could effectively enhance the Fenton-like degradation performance of LaCoO₃. B-site doping can accelerate charge transfer, thereby enhancing catalytic efficiency. LaCo_0.5Ni_0.5O₃ exhibited an optimal degradation efficiency of 76.5%, which was 1.26 and 1.48 times higher than those of LaCoO₃ and LaNiO₃, respectively. Free radical capture and electron paramagnetic experiments showed that LaCo_xNi_1−xO₃ could activate H₂O₂ to produce ˙OH, ˙O₂⁻ and other free radicals. This work may offer new insight for enhancing the Fenton-like degradation performance of LaCoO₃ by another metal substitution at the B-site.