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Kinetics of oxytetracycline sorption on magnetite nanoparticles
Rakshit, S.; Sarkar, D.; Punamiya, P. & Datta, R.
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 nanomagnetite-
based remediation system for tetracycline group
of antibiotics.
Keywords
Adsorption; Oxytetracycline; Nanomagnetite; Kinetics; Thermodynamics; Remediation
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