Adsorption of lead from simulated wastewater via electrocoagulation process: kinetics and Isotherm Studies

Abstract

The present research was carried out to study the adsorption phenomenon via a batch electrocoagulation cell. Simulated wastewater contain heavy metal such as lead is used as an experimental solution. This simulated solution was natural and the effecting other parameters were a constant stirring speed ( 150 rpm), (5-60) minutes of contact time, (10-300) ppm of lead concentration, and (0.2-2.6) Ampere of applied direct current. The results show that equilibrium isotherm curves gave a good fitting with Langmuir and Freundlich models with square regression values (0.975 and 0.767) respectively. Moreover, this research study the kinetics of adsorption using Lagergren's first-order equation and Ho's second ̶ order expression. The intra-particle diffusion model is studied to explore the intra-particle diffusion graphically. The thermodynamic parameters ΔG, ΔH, and ΔS were studied, the result shows that the adsorption process of lead was spontaneous and endothermic in nature.