Enhanced electrochemical degradation of 4-Nitrophenol molecules using novel Ti/TiO2-NiO electrodes.

Removal of 4-Nitrophenol (4-NP) compounds by the electrochemical degradation method using Ti/TiO 2 -NiO electrodes was successfully conducted. This study aims to study the activity of Ti/TiO 2 -NiO electrodes in the electrocatalytic degradation of 4-NP as organic compound pollutants. Ti/TiO 2 -NiO preparation was carried out by the wet impregnation technique, then TiO 2 -NiO composites were sprayed on the surface of Titanium electrodes. The electrode was characterized by X-Ray Diffraction (XRD), a Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), and Cyclic Voltammetry (CV). A Diffractogram XRD of TiO 2 -NiO composites showed a characteristic peak of TiO 2 -NiO at 2 θ = 33°. Meanwhile, analysis of the SEM surface morphology showed that NiO with an average particle size of 22.07 μm can be attached to the surface of the Ti/TiO 2 plate. Electrocatalytic degradation of 4-NP compounds was found to be optimum at pH 11 and 80 min electrolysis time with a rate constant of 0.0373 min−1. The electrochemical degradation exhibited the percentage of removing 4-NP rate of >95% with good electrode measurement stability. • Ti/TiO 2 -NiO electrodes were designed for electrochemical 4-nitrophenol degradation. • It exhibited high catalytic degradation with the constant rate 0.0373 min−1. • Mechanism for the rate of degradation of 4-NP is proposed. • The method is promising for real water treatment. [ABSTRACT FROM AUTHOR]