Kinetic, Isotherm and Thermodynamic Studies of the Adsorption of Thymol Blue onto Powdered Activated Carbons from <i>Garcinia cola Nut</i> Shells Impregnated with H<sub>3</sub>PO<sub>4</sub> and KOH: Non-Linear Regression Analysis — Oak Academic Publishing
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Kinetic, Isotherm and Thermodynamic Studies of the Adsorption of Thymol Blue onto Powdered Activated Carbons from <i>Garcinia cola Nut</i> Shells Impregnated with H<sub>3</sub>PO<sub>4</sub> and KOH: Non-Linear Regression Analysis
Materials and Process Engineering Team (MPET), Research Unit of Noxious Chemistry and Environmental Engineering (RUNOCHEE), Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
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Department of Chemical and Process Engineering, Faculty of Industrial Engineering, University of Douala, Douala, Cameroon
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Materials and Process Engineering Team (MPET), Research Unit of Noxious Chemistry and Environmental Engineering (RUNOCHEE), Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
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Freiburg Materials Research Center (FMF), University of Freiburg, Freiburg, Germany
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Department of Chemistry, Faculty of Science, University of Bamenda, Bambili, Cameroon
1 Materials and Process Engineering Team (MPET), Research Unit of Noxious Chemistry and Environmental Engineering (RUNOCHEE), Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
2 Department of Chemical and Process Engineering, Faculty of Industrial Engineering, University of Douala, Douala, Cameroon
3 Materials and Process Engineering Team (MPET), Research Unit of Noxious Chemistry and Environmental Engineering (RUNOCHEE), Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
4 Freiburg Materials Research Center (FMF), University of Freiburg, Freiburg, Germany
5 Department of Chemistry, Faculty of Science, University of Bamenda, Bambili, Cameroon
In this work, activated carbons (ACs) prepared by chemical activation of garcinia cola nut shell impregnated with H 3 PO 4 (CBH 2/1 ) and KOH (CBK 1/1 ) were used to study the kinetics, equilibrium and thermodynamics of the adsorption of thymol blue from aqueous solution. The characterization of ACs showed the BET measurements gave surface area and total pore volume respectively of 328.407 m 2 · g -1 and 0.1032 cm 3 · g -1 for CBH 2/1 and 25.962 m 2 · g -1 and 0.03 cm 3 · g -1 for CBK 1/1 ; elemental analysis showed a high percentage of carbon in both ACs. Influence of parameters such as initial pH, contact time, adsorbent mass, initial concentration, ionic strength and the effect of temperature on the removal of thymol blue from aqueous solution were studied in batch mode. The studies showed that equilibrium adsorption was attained after 60 minutes for the two ACs, adsorption capacity increased with increasing concentration of thymol blue, and maximum adsorption capacity was obtained at an acidic environment with pH 2. Avrami’s non-linear kinetic expression was the best suited for describing the adsorption kinetics of thymol blue onto ACs, while equilibrium data showed that the three-parameter isotherms better described the adsorption process since R 2 > 0.96, and the error functions were lowest for all of them. Maximum adsorption capacity values obtained using the three-parameter Fritz-Schlunder equation were 32.147 mg · g -1 for CBH 2/1 and 67.494 mg · g -1 for CBK 1/1 . The values of the model parameters g and mFS respectively, obtained using the Redlich-Peterson and Fritz-Schlunder III isotherms below 1, showed that the adsorption of thymol blue by the ACs occurred on heterogeneous surfaces. Thermodynamic analyses of the data of the adsorption of thymol blue onto ACs revealed that the adsorption process was temperature dependent, endothermic and spontaneous.
KeywordsGarcinia Cola Nut ShellChemical ActivationElemental AnalysisNon-Linear RegressionAdsorption IsothermsAdsorption Kinetic Models
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