Evaluation of Kinetic Models of Lead Uptake from Wastewater by Activated Carbon Derived from Coconut Leaves

摘要

Activated carbon was prepared from coconut leaves by using chemical activation method, usingphosphoric acid as dehydrating agent and at slow pyrolysis of 400°C in inert atmosphere. The presentstudy, explored the feasibility of using waste coconut leaves (CL) based carbon as adsorbent for theremoval of lead under different temperature conditions from waste solution. BET surface area of CL 3found 1060.57 m 2 /g greater than CL 1 and CL 2 . The batch sorption study experiments were conductedwith respect to solute concentration (2.8-110 mg/L) and solution temperature (40-70°C). The LangmuirIsotherm, Freundlich Isotherm and Temkin Isotherm studies were conducted and applied to theexperimental equilibrium data, and isotherm constants are calculated. A comparison of kinetic modelswas applied to the adsorption of lead ion. Coconut leaves carbon was evaluated for the, Elovich,intraparticle diffusion and Bangham’s kinetic models. The experimental data fitted very well for thepseudo first-order and pseudo second-order. The results show that the sorption capacity increaseswith an increase in solution temperature from 40°C, 50°C, 60°C and 70°C. The results have establishedgood potentiality for the carbon particles to be used as a sorbent for the removal of lead fromwastewater.