Comparison of Langmuir and Freundlich Isotherms for Adsorption of Color and
Chemical Oxygen Demand (COD) from Textile wastewater Using Activated Carbon
Derived from Groundnut Shell.
Zara Kyari Kolo1, Sunday G. Yadima2 andAbimbolaYisau
Department of Civil Engineering Technology, Ramat
Polytechnic, Maiduguri, Nigeria1,Department of Civil and Water
Resources Engineering, University of Maiduguri, Nigeria2, Deparment
of Agricultural and Environmental Engineering, Faculty of Technology,University
of Ibadan, Ibadan, Nigeria3.
Adsorption isotherm is an invaluable curve which describes the
phenomenon governing the retention or mobility of a substance from aqueous
porous medium to a solid phase. The Langmuir and Freundlich adsorption isotherms
were used in this study to model the equilibrium adsorption data obtained for
adsorption of Color and CODfrom textile wastewater using activated carbon
produced from groundnut shell. The adsorption process was done under two
conditions viz: varying contact time and varying dosage. The Langmuir and
Freundlich correlation coefficient were determined for each parameter. The
equilibrium adsorption data fitted well to the two models for both Color and COD
with a better fit obtained from the Langmuir model as was evidenced from the
highest R2 value of 0.9319 as compared to the Freundlich isotherm
with highest value of 0.8734.
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