Chitosan-based superparamagnetic composite for tetracycline adsorption
Chitosan; Magnetite; Composite; Adsorption; Tetracycline
Polymer-based magnetic compounds exhibit desirable properties, such as high surface area and easy removal, especially for environmental remediation. Both chitosan and magnetite are biocompatible, biodegradable and non-toxic, in addition to being low-cost and easy to operate, which allows their use mainly in the treatment of wastewater. Therefore, this study was carried out to obtain the chitosan-based magnetite compound (CS/Fe3O4) through the coprecipitation method, where the tetracycline adsorption capacity of the compound was investigated and the equilibrium time was identified. The adsorption studies were prolonged at temperatures of 25 and 35 ± 2 °C and were monitored by readings on the UV-Vis spectrophotometer at 357 nm. The compound was characterized by infrared, X-ray diffraction, zeta potential and magnetic measurements. FTIR, XRD and zeta potential analyzes and magnetization curves confirmed the obtaining of the composite. The results showed that the adsorption of tetracycline at 25 ºC reached the Lagmuir and Sips models, while the adsorption at 35 ºC reached the Freundlich and Sips models. The compound showed a tetracycline adsorption capacity of 2.47x106 mg/g.