Thermodynamic Analysis and Influence of the Ph Value on the Biosorption of Copper Ions Onto Hazelnut Shells
2024
Marković, Marina | Gorgievski, Milan | Štrbac, Nada | Grekulović, Vesna | Marković, Miljan | Zdravković, Milica | Jovanović, Dalibor
The thermodynamic analysis of the copper ions biosorption process using hazelnut shells as a biosorbent, as well as the influence of the pH value on the biosorption capacity, are presented in this paper. The thermodynamic parameters that were analyzed are: activation energy (Ea), change in Gibbs free energy (∆G0), enthalpy (∆H0), and entropy (∆S0), under standard conditions, at different temperatures (25oC, 35oC, and 45oC). The values of the calculated thermodynamic parameters indicate that the biosorption of copper ions onto hazelnut shells is favored at temperatures lower than the room temperature, that the process itself is endothermic and disordered, in which copper ions are bound to the surface of the hazelnut shell by chemisorption. The pH analysis showed that the pH value of the solution has a significant effect on the biosorption capacity, whereby the biosorption capacity increases proportionally with the increase in the pH value of the solution.
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出版者 University of Belgrade, Technical faculty in Bor (Serbia)