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Efficient removal of glyphosate from aqueous solutions by adsorption on Mg–Al-layered double oxides: thermodynamic, kinetic, and mechanistic investigation

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Abstract

Up to 90% of glyphosate was removed in 40 min by a 2:1 Mg2Al-layered double oxide (LDO) at pH 10, and the adsorption kinetics fitted a pseudo-second-order law. The adsorption isotherms were type L, and the Langmuir model best fitted the experimental data, with qmax of 158.22 μg/mg at 25 °C. The intraparticle diffusion model suggested that the adsorption process is dependent on the thickness and formation of the film at the solution/solid interface. The XRD results excluded the intercalation of glyphosate anions, and FTIR along with solid-state 13C and 31P MAS NMR confirmed that the glyphosate anions interact through the carboxylate and/or phosphonate moieties, both in end-on and side-on modes to the LDO surface. Glyphosate removal was also investigated in the presence of different anionic species, and simultaneous adsorption showed that carbonate and phosphate ions strongly influence glyphosate removal.

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Acknowledgements

The diffractograms were measured in the Laboratory of Catalysis and Sustainable Energy (LACES) of Rio de Janeiro Federal University (UFRJ). Atomic absorption analyses were performed in the Atomic Absorption Laboratory of the Institute of Agronomy at Rio de Janeiro Federal Rural University (UFRRJ).

Funding

This study was financed in part by the Office to Coordinate Improvement of University Personnel (CAPES, finance code 001), the National Council for Scientific and Technological Development (CNPq), and the Rio de Janeiro State Research Foundation (FAPERJ).

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All authors read and approved the final manuscript. Material preparation and data experimental and analysis were performed by Emanoel Hottes. The first draft of the manuscript was written by Emanoel Hottes, and all authors commented on previous versions of the manuscript. Conceptualization, Emanoel Hottes, Rosane Nora Castro, Glauco Favilla Bauerfeldt, Clarissa Oliveira da Silva, and Marcelo Hawrylak Herbst. Methodology, Emanoel Hottes, Glauco Favilla Bauerfeldt, Clarissa Oliveira da Silva, Rosane Nora Castro, and Marcelo Hawrylak Herbst. Material characterization, Emanoel Hottes, Rosane Nora Castro, Jackson Henrique Cardoso de Lima, Luan Pereira Camargo, Luiz Henrique Dall’Antonia, and Marcelo Hawrylak Herbst. Equilibrium, kinetic, and thermodynamic studies, Emanoel Hottes, Glauco Favilla Bauerfeldt, and Clarissa Oliveira. Writing — original draft preparation, Emanoel Hottes. Writing — review and editing, Marcelo Hawrylak Herbst and Glauco Favilla Bauerfeld. Supervision, Rosane Nora Castro and Marcelo Hawrylak Herbst.

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Correspondence to Marcelo Hawrylak Herbst.

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Responsible Editor: Tito Roberto Cadaval Jr

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Supplementary information

The pristine glyphosate FTIR/ATR fits the Temkin and Freundlich isotherms at different temperatures (Supporting information).

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Hottes, E., da Silva, C.O., Bauerfeldt, G.F. et al. Efficient removal of glyphosate from aqueous solutions by adsorption on Mg–Al-layered double oxides: thermodynamic, kinetic, and mechanistic investigation. Environ Sci Pollut Res 29, 83698–83710 (2022). https://doi.org/10.1007/s11356-022-21703-y

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  • DOI: https://doi.org/10.1007/s11356-022-21703-y

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