Magnetic carbon composites as regenerable and fully recoverable adsorbents: Performance on the removal of antidiabetic agent metformin hydrochloride
Küçük Resim Yok
Tarih
2021
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The present work describes three newly-prepared magnetic-carbon composites (M-CCs) applied as adsorbents. The M-CCs were prepared by the co-precipitation method, grafting Fe(II) and Fe(III) oxides onto the surface of different matrices: PAC, GNP and MWCNT in order to achieve M-PAC, M-GNP and M-MWCNT, respectively. The composites were characterized by Fourier Transform Infrared spectroscopy, X-ray Diffraction Spectroscopy. Scanning Electron Microscopy was used for characterization of M-MWCNTs, Transmission Electron Microscopy was used for characterization of M-GNP composites. Thermogravimetric analyses were performed for each of the three M-CCs. It is found that about 70% of M-CCs consist in Fe3O4 nanoparticles. M-CCs adsorption features and performance towards the removal of a pollutant model from aqueous solutions was established. They were tested for Metformin hydrochloride adsorption, a worldwide antidiabetic pharmaceutical agent. The parameters of adsorbent dose, adsorption duration, initial concentration of adsorbate solution, temperature, pH and co-existing ion concentration were considered as adsorption independent variables. The kinetic tests show that the Pseudo second order kinetic model (PSO) fit best the three-adsorption systems. M-GNP is the fastest adsorbent of the three (k(2) = 0.36 g/mg min). The three investigated adsorption systems obey the Langmuir isotherm model. Pinpointing M-GNP (q(m) = 8.83 mg/g) as the most efficient adsorbent in normal conditions, and M-MWCNT (q(m) = 26.17 mg/g at 318 K) at higher values of temperature. Acid conditions favor adsorption of Metformin hydrochloride onto M-MWCNT, alkaline for M-PAC, whereas M-GNP provides best performance under amphoteric conditions. Coexisting ions affected Metformin hydrochloride adsorption only in case of M-MWCNT and M-GNP. Desorption tests were also carried out by using phosphate buffer solution. M-GNP provides best desorption ratios, reaching nearly 66% of Metformin hydrochloride desorption after each use. (C) 2021 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
Metformin hydrochloride adsorption, Magnetic nanoparticles, Graphene nanoplatelet, Multiwalled carbon nanotubes
Kaynak
Chemical Engineering Research & Design
WoS Q Değeri
Q2
Scopus Q Değeri
Q2
Cilt
168
