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Fe3O4@C Matrix with Tailorable Adsorption Capacities for Paracetamol and Acetylsalicylic Acid: Synthesis, Characterization, and Kinetic Modeling

1
“Victor Babeș” University of Medicine and Pharmacy Timișoara, Faculty of Pharmacy, Eftimie Murgu Square no.2, Timișoara RO-300041, Romania
2
Politehnica University Timişoara, Faculty of Industrial Chemistry and Environmental Engineering, Victoriei Square no.2, Timişoara RO-300006, Romania
3
“Vasile Goldiş” Western University of Arad, The Institute of Life Sciences no.86, Liviu Rebreanu Street, RO-310414 Arad, Romania
4
“Victor Babeș” University of Medicine and Pharmacy Timișoara, Faculty of Medicine, Eftimie Murgu Square no.2, Timișoara RO-300041, Romania
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Molecules 2019, 24(9), 1727; https://doi.org/10.3390/molecules24091727
Received: 25 March 2019 / Revised: 16 April 2019 / Accepted: 29 April 2019 / Published: 3 May 2019
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Abstract

In this study Fe3O4@C matrix was obtained by combustion method and used hereafter as adsorbent for paracetamol and acetylsalicylic acid removal from aqueous solutions. The Fe3O4@C matrix was characterized by electronic microscopy, X-ray diffraction, thermal analysis, Fourier-transform infrared spectroscopy, and magnetic measurements. Two kinetic models of pseudo first-order and pseudo-second-order for both paracetamol and acetylsalicylic acid were studied. The experimental data were investigated by Langmuir, Freundlich, and Redlich–Peterson adsorption isotherm models. The adsorption followed the Redlich–Peterson and pseudo-second-order models with correlation coefficients R2 = 0.98593 and R2 = 0.99996, respectively, for the adsorption of paracetamol; for the acetylsalicylic acid, the adsorption followed the Freundlich and pseudo-second-order model, with correlation coefficients R2 = 0.99421 and R2 = 0.99977, respectively. The equilibrium was quickly reached after approximately 1h for the paracetamol adsorption and approximately 2h for acetylsalicylic acid adsorption. According to the Langmuir isotherm, the maximum adsorption capacity of the magnetic matrix was 142.01 mg·g−1 for the retention of paracetamol and 234.01 mg·g−1 for the retention of acetylsalicylic acid. The benefits of using the Fe3O4@C matrix are the low cost of synthesis and its easy and fast separation from solution by using an NdBFe magnet. View Full-Text
Keywords: Fe3O4@C matrix; combustion method; magnetic properties; adsorption; kinetics; isotherms Fe3O4@C matrix; combustion method; magnetic properties; adsorption; kinetics; isotherms
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Moacă, E.-A.; Mihali, C.-V.; Macaşoi, I.-G.; Racoviceanu (Băbuţă), R.; Şoica, C.; Dehelean, C.-A.; Păcurariu, C.; Florescu, S. Fe3O4@C Matrix with Tailorable Adsorption Capacities for Paracetamol and Acetylsalicylic Acid: Synthesis, Characterization, and Kinetic Modeling. Molecules 2019, 24, 1727.

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