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adsorption-kinetics
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Synthesis of "(aminomethyl)phosphonic acid-functionalized graphene oxide", and comparison of its adsorption properties for thorium(IV) ion, with plain graphene oxide
, Article Radiochimica Acta ; Volume 110, Issue 1 , 2022 , Pages 37-49 ; 00338230 (ISSN) ; Outokesh, M ; Ahmadi, S. J ; Zahakifar, F ; Sharif University of Technology
De Gruyter Open Ltd
2022
Abstract
The current study presents a simple and scalable method for the synthesis of (aminomethyl)phosphonic acid-functionalized graphene oxide (AMPA-GO) adsorbent. The chemical structure of the new material was disclosed by different instrumental analyses (e.g. FTIR, Raman, XPS, AFM, TEM, XRD, CHN, and UV), and two pertinent mechanisms namely nucleophilic substitution and condensation were suggested for its formation. Adsorption experiments revealed that both AMPA-GO and plain GO have a high affinity toward Th(IV) ions, but the AMPA-GO is superior in terms of adsorption capacity, rate of adsorption, selectivity, pH effect, etc. Indeed, the AMPA-GO can uptake Th(IV) nearly instantaneously, and...
Removal of methylene blue dye from aqueous solutions using carboxymethyl-β-Cyclodextrin-Fe3O4 nanocomposite: Thermodynamics and kinetics of adsorption process
, Article Russian Journal of Physical Chemistry A ; Volume 96, Issue 2 , 2022 , Pages 371-380 ; 00360244 (ISSN) ; Aghaie, H ; Monajjemi, M ; Gholami, M. R ; Sharif University of Technology
Pleiades journals
2022
Abstract
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...