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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Preparation and characterization of activated carbon from corncob by chemical activation with H
3
PO
4
for 2,4-dichlorophenoxyacetic acid adsorption
Chemical Engineering Journal, Volume 173, No. 2, Year 2011
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Description
Corncob activated carbon (CCAC) was prepared and its ability to remove 2,4-dichlorophenoxyacetic acid (2,4-D) from aqueous solutions was studied. The BET surface area, Langmuir surface area and cumulative pore volume of CCAC were 1273.91m/g, 2010.12m2/g and 0.900cm3/g, respectively. The adsorption kinetics was best represented by the pseudo-second-order model. The superiority of the Freundlich isotherm model in describing the equilibrium adsorption data was shown by the adjusted correlation coefficients (R2adj) and root-mean squared error (RMSE) values. High percent removal of 69.10, 69.58 and 73.86% were achieved for 2,4-D initial concentration of 400mg/L at 30, 40 and 50°C, respectively. Activation energy, Ea for the adsorption was determined to be 39.87kJ/mol and a diffusion-controlled process indicating physisorption mechanism was proposed. From the thermodynamic parameters determined, the adsorption was found to be spontaneous and endothermic in nature. Intraparticle diffusion and Boyd kinetic models confirmed film diffusion as the rate-controlling step. A single-stage batch adsorber was designed to obtain the mass of CCAC required to achieve desired percent removal of 2,4-D from effluent solutions of different volumes using the Freundlich equation. © 2011 Elsevier B.V.
Authors & Co-Authors
Njoku, Victor Obinna
Malaysia, Nibong Tebal
Usm Engineering Campus
Nigeria, Owerri
Imo State University
Hameed, Bassim H.
Malaysia, Nibong Tebal
Usm Engineering Campus
Statistics
Citations: 173
Authors: 2
Affiliations: 2
Identifiers
Doi:
10.1016/j.cej.2011.07.075
ISSN:
13858947
Research Areas
Environmental