A novel particle electrode based on antimony tailings microspheres was successfully constructed by ultrasonic immersion calcination method, and the degradation of RhB was studied in a three-dimensional electrochemical reactor (3DER). It was characterized by XRD, SEM, EDS, XPS, cyclic voltammetry and linear sweep voltammetry. When the pH value is 5.00, the dosage of Fe/Cu@antimony tailing is 1.50 g/L, the initial concentration is 100 mg/L, and the current density is 20 mA/cm², the degradation efficiency is the best (99.40% for RhB and 98.81% for TOC) within 15 min. The results show that in the three-dimensional electrochemical oxidation system, electrochemical oxidation and electro Fenton oxidation occur at the same time to cause the increase of hydroxyl radicals. According to LC-MS analysis and EPR characterization, it can be found that the main degradation mechanism of RhB is that hydroxyl radicals continuously attack RhB, and realize rapid degradation of RhB through deethylation, deamination, dealkylation, decarboxylation, chromophore splitting, ring opening and mineralization. Fe/Cu@antimony tailing particles are both electrodes for electrochemical oxidation and catalysts for Fenton oxidation. The degradation effect of RhB remained at 94% after 6 cycles, and the leaching rates of Fe and Cu are only 1.20% and 0.79%, indicating that Fe/Cu@AT had significant stability. This work provides a new insight into the establishment of an efficient and stable three-dimensional electrocatalytic particle electrode.

Professor and doctoral director of Kunming University of Science and Technology. He is currently the executive deputy director of the National Local Joint Engineering Research Center for Exhaust Gas Resource Utilization in Metallurgy and Chemical Industry. He has undertaken more than 30 research projects, including the National Key Research and Development Program, the National Science and Technology Major Project, and the National Natural Science Foundation of China. Published more than 70 academic papers, 68 of which are included in SCI/EI. Applied for 184 invention patents, 106 authorized, 2 patents licensed. Presided over the formulation of 2 local standards in Yunnan Province. He has won the first and second prizes of national teaching achievements, and the second prize of provincial science and technology award.