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Study of phenobarbital removal from the aqueous solutions employing magnetite-functionalized chitosan

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Abstract

Due to its wide use in anticonvulsant pharmacotherapy, phenobarbital (PHEN) is an aquatic contaminant with a high prevalence in the environment. In this adsorption study, chitosan and chitosan-based magnetic adsorbents containing different amounts of incorporated magnetite (CS, CS·Fe3O4 1:1, CS·Fe3O4 1:5, and CS·Fe3O4 1:10) were used for phenobarbital removal. The magnetic adsorbents were synthesized by co-precipitation method and characterized through FTIR, XRD, MEV, and VSM analysis. In PHEN adsorption, the equilibrium and adsorption kinetic were better adjusted by the Sips and pseudo-second-order model, respectively. Among the four nanoadsorbents used, the maximum phenobarbital adsorption capacity was 94.60 mg g−1 using 25 mg of CS·Fe3O4 1:5, with a concentration of PHEN (50 mg L−1), pH 7.0 at room temperature. The parameters of pH, adsorbent dosage, ionic strength, and thermodynamic study were tested for the adsorbent with the highest performance (CS·Fe3O4 1:5). The nanoadsorbent demonstrates efficiency in the removal of the contaminant for diverse adsorption cycles. Finally, the protocol employing magnetic adsorbents dispenses the subsequent steps of filtration and centrifugation.

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Acknowledgements

The authors would like to thank CAPES, FAPERGS, Laboratório de Materiais Magnéticos Nanoestruturados (LaMMaN), Laboratório de Simulação e Modelagem de Nanomateriais (LASIMON), Laboratório de Magnetismo e Materiais Magnéticos–LMMM, UFSM, and Universidade Franciscana–UFN for the support.

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Franciane Batista Nunes: methodology, investigation, writing—original draft (batistanunesfranciane@gmail.com). Franciele da Silva Bruckmann: visualization, writing—review and editing (francielebruckmann2@gmail.com). Theodoro da Rosa Salles: software, visualization, writing (theodoro.rsalles@gmail.com). Cristiano Rodrigo Bohn Rhoden: conceptualization; writing—review and editing; supervision (cristianorbr@gmail.com).

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Correspondence to Cristiano Rodrigo Bohn Rhoden.

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Nunes, F.B., da Silva Bruckmann, F., da Rosa Salles, T. et al. Study of phenobarbital removal from the aqueous solutions employing magnetite-functionalized chitosan. Environ Sci Pollut Res 30, 12658–12671 (2023). https://doi.org/10.1007/s11356-022-23075-9

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  • DOI: https://doi.org/10.1007/s11356-022-23075-9

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