Thermodynamics studies on the adsorption of phenol from aqueous solution by coffee husk activated carbon | ||||
| Egyptian Journal of Chemistry | ||||
| Article 12, Volume 64, Issue 5, May 2021, Page 2355-2367 PDF (712.8 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2021.30318.2648 | ||||
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| Authors | ||||
Huu Son Ta1; Khu Le Van   1; Thu Thuy Luong Thi 1; Dinh Hung Nguyen2
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| 1Department of Physical Chemistry, Faculty of Chemistry, Hanoi National University of Education, Hanoi, Vietnam | ||||
| 2Vinh Phuc Gifted High School, Vinh Yen City, Vinh Phuc Province, Vietnam | ||||
| Abstract | ||||
| Activated carbons (ACs) obtained from coffee husk by KOH activation at 650 (ACK-650) and 750oC (ACK-750), were used as an adsorbent for the adsorption of phenol from aqueous solution. The ACs was characterized by SEM, EDX, BET, and Boehm titration techniques. The experimental equilibrium data of phenol adsorption was analyzed by eight isotherm models, which are four two-parameter equations (Langmuir, Freundlich, Elovich, and Temkin) and four three-parameter equations (Redlich-Peterson, Sips, Radke-Prausnitz, and Tóth). The results reveal that in general, three-parameter isotherms can provide better prediction than two-parameter isotherms. The best fit for ACK-650 sample is Sips isotherm, while for ACK-750 sample is Redlich–Peterson isotherm. Isosteric heat and thermodynamic parameters ΔGo, ΔHo, and ΔSo of the adsorption were determined, and the results showed that the adsorption of phenol was exothermic and physical in nature. A scale-up of a batch system is designed for 2 to 10 L phenol with an initial concentration of 100 mg L-1. | ||||
| Keywords | ||||
| activated carbon; isotherms; isosteric heat; phenol adsorption; thermodynamics | ||||
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