Abstract
Iron oxide nanoparticles (nano-Fe) have been widely used in environmental remediation, including that of emerging contaminants, such as antibiotics. Magnetite nanoparticles (nano-Fe3O4) have been reported to form on the outer surface of nano-Fe and have the potential to be a good sorbent for certain antibiotics. This study reports, for the first time, the kinetics and thermodynamics of adsorption of a common tetracycline group antibiotic, oxytetracycline (OTC), on nano-Fe3O4. Batch sorption kinetics were evaluated by varying initial OTC concentration (0.25–2 mM), nano-Fe3O4 concentration (2.5–20 g L−1), pH (3.8–7.6), temperature (5, 15, 35 °C), and ionic strength (0.01–0.5 M KCl) to derive thermodynamic and kinetic constants. Results show that OTC sorption kinetics is rapid and increases with increasing temperature. The derived thermodynamic constants suggest a surface chemical-controlled reaction that proceeds via an associative mechanism. Results indicate the potential of developing a nano-magnetite-based remediation system for tetracycline group of antibiotics.
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Acknowledgments
The authors thank Dr. Laying Wu of Montclair State University for her help with TEM analysis.
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Rakshit, S., Sarkar, D., Punamiya, P. et al. Kinetics of oxytetracycline sorption on magnetite nanoparticles. Int. J. Environ. Sci. Technol. 11, 1207–1214 (2014). https://doi.org/10.1007/s13762-013-0317-x
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DOI: https://doi.org/10.1007/s13762-013-0317-x