Abstract
The main goal of this study was to assess alternatives to the current challenges on environmental quality and circular economy. The former is here addressed by the treatment of radioactively contaminated solutions, and the latter by using abundant and low-cost biomass. In this paper, we examine the biosorption of hexavalent uranium (U(VI)) in a batch system using the macrophytes Limnobium laevigatum and Azolla sp. by three operational parameters: biomass dose, metal ion concentration, and contact time. Simulated solutions were firstly addressed with two biomasses, followed by studies with real liquid organic radioactive waste (LORW) with Azolla sp. The batch experiments were carried out by mixing 0.20 g biomass in 10 mL of the prepared solution or LORW. The total contact time employed for the determination of the equilibrium times was 240 min, and the initial U(VI) concentration was 0.63 mmol L−1. The equilibrium times were 15 min for L. laevigatum and 30 min for Azolla sp. respectively. A wide range of initial U(VI) concentrations (0.25–36 mmol L−1) was then used to assess the adsorption capacity of each macrophyte. Isotherm models validated the adsorption performance of the biosorption process. Azolla sp. presented a much higher U(VI) uptake (0.474 mmol g−1) compared to L. laevigatum (0.026 mmol g−1). When in contact with LORW, Azolla sp. removed much less uranium, indicating an adsorption capacity of 0.010 mmol g−1. In conclusion, both biomasses, especially Azolla sp., can be used in the treatment of uranium-contaminated solutions.
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Acknowledgements
This study was supported by the Nuclear and Energy Research Institute, the National Nuclear Energy Commission, and the National Council of Technological and Scientific Development.
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Leandro Goulart de Araujo: conceptualization, formal analysis, investigation, methodology, writing — original draft; Ludmila Cabrera Vieira: data curation, investigation, resources, visualization; Tamires Watanabe: data curation, investigation; Rafael Luan Sehn Canevesi: data curation, investigation, writing — review and editing; Edson Antônio da Silva: resources, visualization, supervision, writing — review and editing; Rafael Vicente de Padua Ferreira: data curation, supervision; Júlio Takehiro Marumo: conceptualization, formal analysis, methodology, project administration, resources, visualization, writing —review and editing. All the authors read and approved the final manuscript.
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Highlights
•Azolla sp. uptook much more U than Limnobium laevigatum.
•Equilibrium was reached in less than 30 min.
•In contact with real radioactive waste, U removal was significantly lower.
•Sips model best represented the biosorption of U(VI) by Azolla sp.
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de Araujo, L.G., Vieira, L.C., Canevesi, R.L.S. et al. Biosorption of uranium from aqueous solutions by Azolla sp. and Limnobium laevigatum. Environ Sci Pollut Res 29, 45221–45229 (2022). https://doi.org/10.1007/s11356-022-19128-8
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DOI: https://doi.org/10.1007/s11356-022-19128-8