3D macroporous boron-doped diamond electrode with interconnected liquid flow channels: A high-efficiency electrochemical degradation of RB-19 dye wastewater under low current

Boron-doped diamond (BDD) has proved to be an ideal anode material for the electrolysis of organic sewage. However, the existing two dimensional BDD electrodes with small active area and low mass transfer rates, limit their further improvement in degradation efficiency. In this paper, a novel three dimensional macroporous BDD (3D-BDD) foam electrode with a structure of evenly distributed pores and interconnected networks in which wastewater can flow freely was prepared using a simple and reproducible method. Compared to two dimensional BDD electrodes of the same geometry, the electro-active surface area of 3D-BDD electrode increased by (-)20 times, and the electrochemical oxidation reaction rate constant of RB-19 increased by 350 times. Under optimized conditions, the energy consumption reduced to a minimum of 0.03 kWh(gTOC)(-1), and the MCE reach a maximum of 325.86%.