NIR

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Browsing NIR by Subject "adsorption isotherms"

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    Adsorption isotherms for copper ions biosorption onto onion peels
    (University of Belgrade, Technical Faculty in Bor, 2023) Gorgievski, Milan; Marković, Miljan; Štrbac, Nada; Grekulović, Vesna; Zdravković, Milica
    Langmuir, Freundlich, and Temkin isotherm models were used to study the equilibrium and mechanism of biosorption of copper ions onto onion peels under batch conditions. Isotherm parameters were calculated from the line graphs according to each model. The results obtained on the basis of correlation coefficients, show that the Freundlich isotherm model (R2 = 0.964) is in good agreement with the analyzed experimental data. This model assumes that the surface energy of the adsorbent is heterogeneous, strong binding sites are occupied first, and that the binding energy decreases as the number of occupied adsorbent sites increases.
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    Adsorption isotherms for copper ions biosorption onto walnut shells
    (University of Belgrade, Technical Faculty in Bor, 2022) Marković, Miljan; Gorgievski, Milan; Štrbac, Nada; Božinović, Kristina; Grekulović, Vesna; Mitovski, Aleksandra; Zdravković, Milica
    Equilibrium analysis of copper ions biosorption onto walnut shells is presented in this paper. The experimental data were analyzed using three isotherm models, namely, the Langmuir adsorption isotherm model, the Freundlich adsorption isotherm model, and the Temkin adsorption isotherm model. Obtained results indicate that the Langmuir model fits best the experimental data (R2 = 0.993), indicating that the biosorption of copper ions occurs in a monolayer. The small difference between qe,exp and qe,m point to that the walnut shells are almost completely saturated with copper ions.