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Potential Biopolymer Adsorbent Functionalized with Fe3O4 Nanoparticles for the Removal of Cr(VI) From Aqueous Solution

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Abstract

In the present study, an adsorbent with a synergistic effect was developed from chitosan (CS) and Fe3O4 nanoparticles (Fe3O4 Nps) to remove Cr(VI) from aqueous solutions. The Fe3O4 Nps were synthesized by co-precipitation and were characterized by TEM. The CS/NPs composites were prepared by electrospinning technique and analyzed by SEM, FT-IR, DSC, and TGA. In the batch system, the influence of Fe3O4 Nps content, pH, contact time, Cr(VI) initial concentration, adsorbent dosage, and the temperature was investigated; the Cr(VI) concentration was determined using a colorimetric method by UV–Vis spectroscopy. The Fe3O4 Nps presented a quasi-spherical shape and an average size of 18 nm, with a low particle distribution. The SEM analysis reveals the presence of highly porous, interconnected micrometric structures. The optimal adsorption conditions were 1% load of Fe3O4 Nps by weight of CS, pH 3, 25 °C, and equilibrium was reached at just 9 min. Besides, the adsorption is favored by increasing Cr(VI) initial concentration and adsorbent dosage. The studies of reaction kinetics and adsorption equilibrium showed that the experimental data were better fitted to the Pseudo-second-order and Langmuir isotherm models, establishing monolayer formation and chemisorption. The maximum adsorption capacity of CS/Fe3O4 Nps was 440.75 mg/g, which indicates a high affinity of the adsorbent for Cr(VI). Finally, a kinetic diffusion study established that intraparticle diffusion, and in particular surface diffusion, are important resistances in the transport of Cr(VI) from the liquid phase to the active site.

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Data Availability

The datasets used and/or analyzed in this study are available by the corresponding author on reasonable request (eulalia.vanegas@ucuenca.edu.ec).

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Funding

This study was financially supported by the Dirección de Investigación de la Universidad de Cuenca (DIUC) through the project DIUC_XV_2017_006.

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Authors and Affiliations

  1. Center for Environmental Studies, Department of Applied Chemistry and Production Systems, Faculty of Chemical Sciences, University of Cuenca, Av. 12 de Abril, 010203, Cuenca, Ecuador

    Eulalia Vanegas & Christian Cruzat

  2. Faculty of Chemical Sciences, University of Cuenca, Av. 12 de Abril, 010203, Cuenca, Ecuador

    Pablo Castro & Diego Juela

  3. Laboratorio de Química Inorgánica y Organometálica, Departamento de Química Analítica e Inorgánica, Facultad de Ciencias Químicas, Universidad de Concepción, Edmundo Larenas 129, Casilla 160-C, Concepción, 4070386, Chile

    Néstor Novoa & Ramón Arrué

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  1. Eulalia Vanegas
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Contributions

All authors contributed to the study's conception and design. Investigation, Formal analysis, Writing = original draft, Writing = review & editing were performed by EV; Methodology, Writing = original draft, Formal analysis, and Investigation PC; Investigation was performed by NN; Investigation and Formal analysis were performed by RA; Visualization, Data curation, Writing = review & editing were performed by DJ; Conceptualization, Writing = original draft; Editing, Supervision, Validation, Resources, Funding acquisition, and Project administration were performed by CC. The first draft of the manuscript was written by EV, CC and PC and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Eulalia Vanegas.

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Vanegas, E., Castro, P., Novoa, N. et al. Potential Biopolymer Adsorbent Functionalized with Fe3O4 Nanoparticles for the Removal of Cr(VI) From Aqueous Solution. J Polym Environ 30, 2022–2036 (2022). https://doi.org/10.1007/s10924-021-02323-y

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