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Removal of methylene blue dye from aqueous solutions using carboxymethyl-β-Cyclodextrin-Fe3O4 nanocomposite: Thermodynamics and kinetics of adsorption process

Ghazimokri, H.S ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1134/S0036024422020108
  3. Publisher: Pleiades journals , 2022
  4. Abstract:
  5. Abstract: 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 (ΔGad° < 0), standard enthalpy change (ΔHad° < 0) and standard entropy change (ΔSad° < 0), the nature of the adsorption process was spontaneous, exothermic and mainly physisorption. © 2022, Pleiades Publishing, Ltd
  6. Keywords:
  7. Adsorption ; Adsorption kinetics ; Adsorption thermodynamics ; Isotherm model ; Removal percentage ; Aromatic compounds ; Cyclodextrins ; Dyes ; Fourier transform infrared spectroscopy ; Free energy ; Gibbs free energy ; High resolution transmission electron microscopy ; Kinetics ; Nanocomposites ; Physisorption ; Scanning electron microscopy ; Adsorption kinetics ; Adsorption process ; Adsorption thermodynamics ; Carboxymethyl ; Isotherm modeling ; Methylene blue dye ; Removal percentage ; Synthesised ; Thermodynamics and kinetics of adsorptions ; β-CD ; Magnetite
  8. Source: Russian Journal of Physical Chemistry A ; Volume 96, Issue 2 , 2022 , Pages 371-380 ; 00360244 (ISSN)
  9. URL: https://link.springer.com/article/10.1134/S0036024422020108