| Uranium-containing wastewater produced from the nuclear fuel cycle poses severe hazards to human health and the ecological environment. In this study, a carboxylated multi-walled carbon nanotube/copper oxide/nano silver modified graphite felt electrode (MCA) material was designed, which produced an electrode with good electrosorption performance, exhibiting characteristics of an electrical double layer (EDL) and pseudocapacitance, a high hybrid capacitance electrode. Electrosorption and electro-catalytic reduction coupling processes initially proved the ability to adsorb U(VI). The electrosorption properties of different materials for U(VI) adsorption and the adsorption mechanism of composite material (MCA-2) for U(VI) were systematically investigated. Results indicate that among different experimental electrodes, MCA-2 had the highest removal rate (93.31%). In the capacitive deionization (CDI) experiments, various factors such as voltage, pH, U(VI) concentration were examined for their influence on the electrosorption of U(VI). It was found that MCA-2 showed a high removal rate for U(VI) across a broad range of voltages, pH levels, and concentrations. In the characterisation results, it was found that the XPS analysis indicated that U(VI) was reduced to U(IV) in a large amount, which suggests that the major uranium species on the MCA-2 electrode were reduced during the electrosorption process.The MCA composite material is simple to prepare, and it has good electrochemical, and electrosorption properties. It is a potential electrode material for the treatment of radioactive wastewater. |