SUSTAINABLE ABATEMENT OF LEAD (II) FROM WATER VIA HYDROCHLORIC ACID TREATED-ACTIVATED CHARCOAL DERIVED FROMP EANUTSHELLS: EQUILIBRIUM, ISOTHERM AND KINETICS MODELING
The current research was conducted to study the efficiency of hydrochloric acid-chemically treated activatedcharcoal of peanut shells as a biosorbent for Pb (II) ions adsorption in water. The adsorption process was optimisedby evaluating the impact of key variables like pH, contact time, biosorbent dosage and initial lead ions concentration. The optimum conditions for Pb (II) ions adsorption were observed at pH 6, an agitation time of 120 minutes, biosorbent dosage of 1.5 g and an initial Pb (II) ions concentration of 60 mg/L. Under these conditions, Hydrochloric acid-treated activated charcoal derived from peanut shells showed significant adsorption efficiencyof 90.2% lead (II) contaminants in water and exhibited a maximum adsorption capacity of 43.85 mg/g, highlightingitspotential as an economically viable and eco-friendly sustainable adsorbent for Pb 2+ ions removal fromcontaminatedwater. The experimental adsorption data exhibited a strong correlation with the Langmuir isothermmodel, havinganR 2 value of 0.9925, suggesting a strong correlation with chemical interaction mechanisms. Kinetics evaluationrevealed that Pb (II) ions adsorption followed the pseudo-second order model accurately, demonstrating a better correlation, as supported by the high correlation coefficient (R²) value of 0.9845. The results suggest that chemicallymodified peanut shells activated charcoal has promising potential for the abatement of lead (II) ions frompollutedwater. This investigation provides valuable insights into the application of plant and agricultural waste-basedadsorbents for sustainable environmental remediation and pollution control.
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