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Lookup NU author(s): Dr Jie ZhangORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© The Tunisian Chemical Society and Springer Nature Switzerland AG 2024.In this study, a triple-metal MnFeMg-CO3 layered double hydroxide (LDH) was synthesized using the co-precipitation method, maintaining a consistent 1:1:1 molar ratio of Mn/Fe/Mg at a constant pH. Both LDH and calcined samples (CLDH) underwent comprehensive characterization using X-ray fluorescence (XRF), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and determination of the zero-point charge. The investigation delved into various parameters affecting the adsorption capacity for Congo Red (CR), encompassing pH levels, initial concentrations, and more. Regarding kinetics modeling, the study employed pseudo first-order (PFO), pseudo second-order (PSO), and pseudo nth-order (PNO) models. Notably, the PNO model demonstrated exceptional agreement with the experimental data (R2 > 0.99), achieving a remarkable 97% removal rate within minutes across a broad pH range (5–11). Isotherm modeling involved the application of classical models (Langmuir, Freundlich, Sips, and Fritz), with the Fritz model aptly describing the adsorption process. To delve deeper into the adsorption mechanism, advanced statistical physics models were proposed, including Monolayer with one energy (M1), Monolayer with two energies (M2), and Double layer with one energy (M3). Statistical physics parameters indicated that model 3 closely mirrored experimental outcomes. Additionally, energy calculations from the models suggested a physical interaction between CR molecules and LDHs, with negative Gibbs free energy values confirming the thermodynamic spontaneity of CR adsorption. Furthermore, the photocatalytic performance of MnFeMg-CO3 was evaluated under UV light irradiation at varying pH levels and H2O2 concentrations. Notably, maximum CR removal occurred after 120 min at elevated concentrations, showcasing significant enhancement through the photo-Fenton reaction (C/C0 = 0.59). This comprehensive study aims to provide novel insights into advanced materials capable of dual functionality (adsorption and photocatalysis) for effective water pollutant remediation.
Author(s): Benamara R, Kahoul F, Chebli D, Bouguettoucha A, Tahraoui H, Knani S, zhang J, Amrane A
Publication type: Article
Publication status: Published
Journal: Chemistry Africa
Year: 2024
Pages: epub ahead of print
Online publication date: 31/10/2024
Acceptance date: 23/09/2024
Date deposited: 26/11/2024
ISSN (print): 2522-5758
ISSN (electronic): 2522-5766
Publisher: Springer Science and Business Media Deutschland GmbH
URL: https://doi.org/10.1007/s42250-024-01087-x
DOI: 10.1007/s42250-024-01087-x
ePrints DOI: 10.57711/7xyq-mc18
Data Access Statement: The data and material for the current study are included in this published article.
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