Analysis of thermodynamics, kinetics and equilibrium Isotherm on Fe3+/Fe2+ adsorption onto palm kernel shell activated carbon (PKSAC): A low-cost adsorbent
Date
2014-01-15
Journal Title
Journal ISSN
Volume Title
Publisher
SCIENCEDOMAIN international
Abstract
Adsorption of Fe3+/Fe2+ from a polluted shallow well water onto a palm kernel shell activated carbon (PKSAC) has been studied. Batch experiment was adopted to study the Removal efficiency of Fe3+/Fe2+ on varying contact time, temperature, adsorbent loading and concentrations. Equilibrium isotherm and kinetic were also studied. Removal efficiency progressed with contact time till the peak adsorption time of 100 minutes when the efficiency remained at equilibrium. Also, removal efficiency got to equilibrium at the peak values of 80ºC, 4.8g and 12.5mg/l for temperature, adsorbent loading and concentration variations respectively. The adsorption isotherm models fitted the isotherm data got at 25ºC, 40ºC and 80ºC in this order; Langmuir > Temkin>Freunlich. The dimensionless separation factor of 0.012, 0.017 and 0.015 for 25ºC, 40ºC and 80ºC respectively confirmed favorable adsorption of Fe3+/Fe2+ on the PKSAC adsorbent. Langmuir adsorption capacity increased from 203.9mg Fe3+/Fe2+/g to 389.3 mg Fe3+/Fe2+/g when the
temperature increased from 25ºC to 40ºC but decreased to 308.1 mg Fe3+/Fe2+/g at temperature of 80ºC. The kinetic models described the kinetic study data got at 25ºC, 40ºC and 80ºC as follows; power-function>second-order>Elovick>intra-diffusion>first-order kinetics. Mass transfer through liquid film diffusion controlled the adsorption of Fe3+/Fe2+ onto PKSAC. Negative values of the Thermodynamic parameters (Δ , Δ and Δ) got at various temperature values showed favorability of adsorption of Fe3+/Fe2+ onto PKSAC.nIt is therefore concluded that PKSAC removed Fe3+/Fe2+ from aqueous solution.
Description
A research article on "thermodynamics, kinetics and equilibrium Isotherm on Fe3+/Fe2+ adsorption onto palm kernel shell activated carbon (PKSAC)" It contains graphs, tables and mathematical formulas. It is an Open Access article distributed under the terms of the Creative Commons
Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and
reproduction in any medium, provided the original work is properly cited
Keywords
Adsorption, Fe3+/Fe2, isotherm models, equilibrium, kinetic models, removal efficiency, thermodynamics., Department of Environmental Technology
Citation
Uzoije, A. P., Uche, C. C. & Ashiegbu D. (2014). Analysis of thermodynamics, kinetics and equilibrium Isotherm on Fe3+/Fe2+ adsorption onto palm kernel shell activated carbon (PKSAC): a low-cost adsorbent, American Chemical Science Journal, 4(3): pp. 298-325.