Photoelectrocatalytic decolorization of diazo dye by zinc oxide nanophotocatalyst and carbon nanotube based cathode: Determination of the degradation products

► Dye degradation by photocatalysis combined with photoelectro-Fenton process. ► Immobilization of ZnO nanoparticles on glass plates. ► Optimization of the treatment process by central composite design. ► Determination of the degradation products using GC-MS analysis.