Arsenic removal from water using capacitive deionization electrode materials derived from Moringa oleifera seeds

Low-cost activated carbon electrodes derived from Moringa oleifera seeds were developed for the efficient removal of Arsenic from contaminated water by capacitive deionization (CDI). The electrodes were synthesized using a carbon slurry composed of Moringa oleifera powder (MOP), poly(vinylidene fluoride), and carbon black. Scanning electron microscopy was used to analyze the surface morphology. In contrast, their electrochemical properties, including capacitance and electrical conductivity, were analyzed through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The capacitance values, as determined from CV and EIS measurements, were 201.3 Fg −1 and 122.62 Fg −1 for MOP (MOP-1:1 and MOP-1:2), respectively. The Arsenic removal efficiency was evaluated under optimized electrochemical conditions, achieving an efficiency of 89.38% when treating a 100 mg/L arsenite solution at an applied voltage of 1.2 V and pH 9. These findings highlight the potential of Moringa oleifera seeds-derived carbon electrodes as sustainable, cost-effective materials for Arsenic removal through CDI.