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Статья
2022

Removal of Methylene Blue Dye from Aqueous Solutions Using Carboxymethyl-β-Cyclodextrin-Fe3O4 Nanocomposite: Thermodynamics and Kinetics of Adsorption Process


Hediyeh Sadat GhazimokriHediyeh Sadat Ghazimokri, Hossein AghaieHossein Aghaie, Majid MonajjemiMajid Monajjemi, Mohammad Reza GholamiMohammad Reza Gholami
Российский журнал физической химии А
https://doi.org/10.1134/S0036024422020108
Abstract / Full Text

The applicability of the synthesized carboxymethyl-β-cyclodextrin-Fe3O4 nanocomposite (CM‑β-CD-Fe3O4NPs) as a novel adsorbent for eliminating Methylene blue dye (MB) from aqueous media was investigated. Various techniques including Brunauer Emmett Teller analysis (BET), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) have been used to characterize this novel adsorbent. The effect of initial concentration (C0), pH, adsorbent dosage (dose), contact time (tc), and temperature (T, K) on the removal percentage (Ad%) of MB dye onto CM-β-CD-Fe3O4NPs was studied, and the optimum value of each factor was determined (pH 6.0, dose = 0.20 g, tc = 45.0 min, and T = 298.0 K). Several isotherm models, such as Langmuir, Freundlich and Redlich–Peterson models were used to represent the adsorption experimental results, but the Freundlich model represents better the results than others. The pseudo-second-order kinetics coincided quite with the kinetic results. Based on the obtained thermodynamic values such as standard Gibbs free energy change (\(\Delta G_{{{\text{ad}}}}^{^\circ }\) < 0), standard enthalpy change (\(\Delta H_{{{\text{ad}}}}^{^\circ }\) < 0) and standard entropy change (\(\Delta S_{{{\text{ad}}}}^{^\circ }\) < 0), the nature of the adsorption process was spontaneous, exothermic and mainly physisorption.

Author information
  • Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, IranHediyeh Sadat Ghazimokri & Hossein Aghaie
  • Department of Chemical Engineering, Central Tehran Branch, Islamic Azad University, Tehran, IranMajid Monajjemi
  • Sharif University of Technology, Tehran, IranMohammad Reza Gholami
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