Mechanism study on a novel Cu/Fe co-catalyzed heterogeneous particle mediated activation of hydrogen peroxide for efficient degradation of cyanides

Abstract

The degradation of cyanide ions in cyanide containing wastewater is a major challenge in water treatment. This article uses a one-step hydrothermal method to prepare iron copper bimetallic oxide catalysts and applies them for the rapid degradation of cyanide (CN−). The experimental results show that under the optimal conditions, the removal rate of CN− in the bimetallic catalyst/H2O2 system is close to 100 % within 1 h, which is significantly better than the single metal oxide catalyst. Through characterization by SEM-EDS, XRD, XPS, and combined with catalytic performance experimental analysis, it was found that. There is a synergistic effect between Cu and Fe, which can effectively promote the cycling of metal ions and improve the generation efficiency of hydroxyl radicals (HO•) to a certain extent, thereby improving the degradation performance of CN−. In addition, ion chromatography was used to analyze the oxidation products and a possible pathway for CN− degradation was proposed. This provides new insights and ideas for the development of high-performance bimetallic oxide catalysts for cyanide degradation.