A Brief Review on Environmental Application of Boron Doped Diamond Electrodes as a New Way for Electrochemical Incineration of Synthetic Dyes

Figure 4

Comparison of the COD evolution and colour removal (inset) during the direct and mediated electrolysis of the methylene blue. Indirect electrolysis: Cl⁻ concentration  = 1.2 g dm⁻³; 𝑖=60 mA cm⁻²; flow rate: 180 dm³ h⁻¹; 𝑇=40°C. Direct electrolysis: 𝑖=20 mA cm⁻²; flow rate: 180 dm³ h⁻¹, 𝑇=40°C [22].