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Equilibrium sorption isotherms and kinetics for the sorption of lead onto low cost activated sorbents

Simmi Goel

Studies on the removal of lead (II) ions by adsorption onto acid activated coconut fibres and walnut shells have been carried out. Effect of various parameters like pH, contact time, adsorbent dosage, agitation speed shows 76.1%and 72.6%Pb (II) removal at 2-5, 120minutes, 8g, 160rpmby coconut and walnut activated carbon (CAC &WAC) respectively. Percentage removal of lead (II) ions increased with the increase in initial concentration. Adsorption data were modeled with Freundlich and Langmuir isotherms, first order kinetic equation proposed by Lagergren. Both the isotherms were found to be applicable except Lagergren first order kinetic equation. Adsorption capacity of CAC is found to be more as compared to WAC.