Modelling and optimization of nitrates adsorbed on iron plate electrodes by electrocoagulation process analyzed by response surface methodology

Abstract

The goal of this study is to remove nitrate from aqueous solutions using iron plate electrode as anode and cathode by electrocoagulation process. Nitrate has a moderate capacity for precipitation or adsorption and is a stable, highly soluble ion. As a function of pH, Electrocoagulation time, NaCl concentration, temperature, and voltage, the tests are run. The findings indicate that the highest removal efficiency of 87.52% was attained at a pH of 11.0, Electrocoagulation time of 80 min, NaCl concentration of 2 g/L, voltage of 30 V and 303 K temperature. The monolayer coverage of the adsorbed molecules is suggested by the adsorption of NO3–, which ideally fits the Langmuir adsorption isotherm. First-order kinetics model that describes the adsorption process. The reaction is endothermic and spontaneous, according to thermodynamic studies. Using the experimental data, the predicted data is been analyzed by Response surface methodology.