Degradation of HEDP and MIT in a heterogeneous electro-Fenton-like system using cobalt-based bimetallic catalysts

s Iron-based catalysts are widely used in the electro-Fenton technology, which are limited by strict acidic conditions. Cobalt-based catalysts can undergo Fenton-like reactions with H 2 O 2 under neutral conditions. In this study, a CF@Co 2 NiO x @MgAl-LDH cobalt-based bimetallic catalyst was prepared to study 1-hydroxyethylidene-1 (HEDP) and methylisothiazolinone (MIT) degradation performance in a heterogeneous electro-Fenton system. Cobalt-based bimetallic oxides were first modified with magnesium-aluminum hydrotalcite (MgAl-LDH) and subsequently loaded onto carbon felts (CF) to reduce metal ion leaching and improve catalyst recyclability. The experimental results showed that CF@Co 2 NiO x @MgAl-LDH could effectively remove 93.06% of HEDP and 92.42% of MIT after 2   hours of reaction. Removal of HEDP and MIT was still achieved at 78.62% and 81.09% after four cycles of experiments. Based on the catalyst characterization results, the reasons for the differences in the pollutant removal performance were analyzed and the optimal operating parameters of the CF@Co 2 NiO x @MgAl-LDH for the removal of HEDP and MIT were investigated. This study provides a novel and sustainable strategy for the design and application of cobalt-based catalysts.