Adsorption of Ciprofloxacin on Graphene Oxide-Based Adsorbents: Synthesis, Characterization and DFT Calculations.

Autor: Sanchez, Sergio Nicolas Buitrago1 (AUTHOR), Spaolonzi, Marcela Pires2 (AUTHOR), Cesconeto, Laura Piacentini1 (AUTHOR), Souza, Larissa1 (AUTHOR), Virmond, Elaine3 (AUTHOR), Vieira, Melissa Gurgel Adeodato2 (AUTHOR), Watzko, Elise Sommer3 (AUTHOR), Moreira, Regina de Fátima Peralta Muniz1 (AUTHOR) regina.moreira@ufsc.br
Zdroj: Water, Air & Soil Pollution. Jul2024, Vol. 235 Issue 7, p1-21. 21p.
Abstrakt: In this article, the synthesis of graphene oxide from coal or coke and a composite graphene oxide-geopolymer were carried out to produce adsorbents applied to Ciprofloxacin (CIP) removal from water in a laboratory scale. The characterization analyzes of the adsorbent were performed by Thermogravimetric Analysis (TGA), Zeta Potential (ZP), Particle Size Distribution (PSD), X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Gun Scanning Electron Microscopy (FEG/EDS), and RAMAN spectroscopy. Multilayer graphene oxide was identified after coal or coke thermal treatment and ultrasound exfoliation followed by ozone oxidation of the solid surface. A composite produced using phosphate mining residues and graphene oxide incorporation (22 wt%) showed the highest adsorption capacity. Affinity tests showed removal rates for CIP ranging from 15% to 55%. Kinetic studies indicated that the equilibrium time varied between 100 min and 120 min for three different initial CIP concentrations. With regard to the kinetic study, the pseudo-first order model better described the kinetics at the concentration of 0.05 mmol L-1, while the pseudo-second order model better described the kinetics at concentrations of 0.1 mmol L-1 and 0.2 mmol L-1. The studies on adsorption equilibrium showed that the Langmuir model provided the most accurate fit to the experimental data. The maximum adsorption capacity was found at 45 °C and it was of 0.24 mmol g-1. The possible mechanisms of adsorption are related to electrostatic interactions and covalent bonds. [ABSTRACT FROM AUTHOR]
Databáze: GreenFILE
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