Abstract
Equilibrium adsorption studies of phenol onto activated carbon prepared from groundnut husk was investigated for effectiveness. Groundnut husk s w ere washed, dried at temperatures between 110 ° C and 160 o C, pulverized and finally activated at 200 ° C for 3 hours. Optimum conditions of carbon dosage, pH, contact time and influence of concentration of phenol on carbon were investigated. Several analyses of isotherm data were tested by fitting them into different isotherm (Temkin, Langmuir, Dubinin - Kaganer - Rushkevich and Freundlich) models. The results of the optimization studies indicated an optimum adsorption of phenol with carbon dosage of 2.2 g; pH = 5 and contact time = 5 hours. Temkin, Dubinin - Kaganer - Rushkev ich and Freundlich had high correlation coefficients in the range of 0.853 – 0.9501. The experimental data fitted adequately into these models but not into the Langmuir isotherm model with extremely low regression coefficient of 0.0038. The high correlatio n coefficient s connoted strong interactions between the adsorbate and the adsorbent and a good interpretation of the adsorption behaviour of phenol. However, the Temkin and Dubinin - Kaganer - Rushkevich models showed indications of chemisorptions with high h eat of adsorption of 1531.39 J mol - 1
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