Green recycle of copper ion in saccharin sodium wastewater by direct electrodeposition using rotating thin copper disc electrode

Green recycle and reuse of copper ions in saccharin sodium wastewater have been proved to be practically applicable, and the most difficult electrodeposition step of [CuCl4]2– to Cu0, much more difficult than normal Cu2+ to Cu0, has been successfully overcome by the rotating copper disk method. The developed method was precisely targeted at the demand of saccharin sodium wastewater and met the quality standard of reused copper product for original manufacturing process in Kaifeng Xinghua Special Chemical Ltd., the largest saccharin sodium salt manufacturer. Experimental data show that the rotating disk electrode significantly increased the reaction current in both lab scale and pilot scale, indicating that the disadvantages of the slight increase in the reaction current and low reaction rate in conventional copper electrodeposition have been successfully overcome. Impedance analysis revealed a huge reduction of dissociative electron-transfer capacitance and double-layer capacitance simultaneously. The ove...