Equilibrium and kinetics studies for the adsorption of methylene blue using a new type of activated carbon prepared from Eucalyptus trees
Keywords:الاتزان ، الامتزاز ، صبغة الميثيلين الزرقاء ، الفحم النشط
This research included the preparation of a new adsorbent material by converting low-cost natural waste in an economically inexpensive way into a substance used to treat pollution. This substance may be able to remove other pollutants, especially the dyes used in the textile and fabric dyeing industries in our cities in Iraq. The current study showed through (XRD, SEM, BET, EDX) measurements that the prepared activated carbon contains nanoparticles and is highly efficient in removing various pollutants. Four models of adsorption isotherms were applied to the experimental results of the studied system: Freundlich, Langmuir, Flory-Huggins (FH) and Fowler-Guggenheim (FG). The application of the FH isotherm equation on the experimental data for adsorption of the studied MB dye gave a good linear relationship. At a temperature of 293oKa and with a correlation coefficient (R2) of (0.9914), this indicates the applicability of this isotherm to the practical data of adsorption in the studied system successfully and the values of the constants included in it can be used to indicate the system specifications. From the (FH) isotherm, applied in this study, that the reaction is spontaneous in the direction of adsorption (ΔGo = -104.548) kj/mol. The FG isotherm proved that the lateral interactions between the particles of the adsorbent (W = 8.339 kj/mol) are of the attractive type. Two models of adsorption kinetics were also applied to the practical data of the adsorption under study: pseudo first order and pseudo second order equation. The results indicated that the adsorption reaction is subject to the pseudo second order law.
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Copyright (c) 2023 Muhammad H. H. Al-Rashdi , Emad A.S Al-hyali
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