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Preparation of alumina-supported Fe-Al-La composite for fluoride removal from an aqueous matrix

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Abstract

Using groundwater for human consumption is an alternative for places with no nearby surface water resources. Fluoride is commonly found in groundwater, and the consumption of this water for a prolonged time in concentrations that exceed established limits by WHO and Brazilian legislation on water potability (1.5 mg L−1) can cause harmful problems to human health. For this reason, fluoride removal is an important step before water consumption. In this work, activated alumina was impregnated with Fe-Al-La composite and employed for the first time as an adsorbent for fluoride removal from an aqueous environment. XRD, SEM/EDS, FT-IR, and point of zero charge were used to characterize the prepared adsorbent. The adsorptive performance of adsorbent material was investigated by employing a 23-central composite design (CCD), and the obtained experimental conditions were pH = 6.5 and adsorbent dosage = 3.0 g L−1. A maximum adsorption capacity of 8.17 mg g−1 at 298 K and pH = 6.5 was achieved by Langmuir isotherm to describe the adsorption. The kinetic model that better described experimental data was Avrami, with the kav parameter increasing with the initial concentration from 0.076 to 0.231 (min−1)nav. The nature of adsorption was found to be homogeneous, and it occurs in a monolayer. The fluoride removal performance for the prepared adsorbent was higher than granular activated alumina, showing that supporting Fe-Al-La at the alumina surface increased its fluoride adsorption capacity from 16 to 42% at the same experimental conditions. Finally, the influence of co-existing ions Cl, SO42−, and NO3 was evaluated in fluoride adsorption, and the material presented great selectivity to fluoride. Thus, Fe-Al-La/AA adsorbent is a promising material for fluoride removal from water.

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The datasets used and analyzed during the current study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors would like to thank CAPES (Coordination for the Improvement of Higher Education Personnel) and CNPq (National Council for Scientific and Technological Development) for their financial support.

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Contributions

Conceptualization: [J.M. Gasparotto, E.L. Foletto, S.L. Jahn, G. L. Dotto]; Methodology: [D. Pinto, N. de Paula, M. Maraschin], Formal analysis and investigation: [E. Carissimi, D.S.P. Franco]; Writing—original draft preparation: [E.L. Foletto, J.M. Gasparotto, G.L. Dotto]; Writing—review and editing: [E.L. Foletto, J.M. Gasparotto, G.L. Dotto]; Funding acquisition: [E.L. Foletto, L.F.O. Silva, S.L. Jahn, E. Carissimi]; Supervision: [E.L. Foletto, L.F.O. Silva, G. L. Dotto]. All authors read and approved the final manuscript.

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Correspondence to Guilherme L. Dotto.

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Responsible Editor: Philippe Garrigues

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Gasparotto, J.M., Pinto, D., de Paula, N. et al. Preparation of alumina-supported Fe-Al-La composite for fluoride removal from an aqueous matrix. Environ Sci Pollut Res 30, 42416–42426 (2023). https://doi.org/10.1007/s11356-023-25231-1

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  • DOI: https://doi.org/10.1007/s11356-023-25231-1

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