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

Autor: Hottes E; Instituto de Química, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil., da Silva CO; Instituto de Química, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil., Bauerfeldt GF; Instituto de Química, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil., Castro RN; Instituto de Química, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil., de Lima JHC; Instituto de Química, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil., Camargo LP; Departamento de Química, Universidade Estadual de Londrina, Londrina, PR, Brazil., Dall'Antonia LH; Departamento de Química, Universidade Estadual de Londrina, Londrina, PR, Brazil., Herbst MH; Instituto de Química, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil. herbst@ufrrj.br.; Laboratório de Síntese Inorgânica e Materiais, Departamento de Química Fundamental, Instituto de Química, UFRRJ, BR465 km7, Seropédica, RJ, 23897-000, Brazil. herbst@ufrrj.br.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2022 Nov; Vol. 29 (55), pp. 83698-83710. Date of Electronic Publication: 2022 Jun 30.
DOI: 10.1007/s11356-022-21703-y
Abstrakt: Up to 90% of glyphosate was removed in 40 min by a 2:1 Mg 2 Al-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 q max 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 13 C and 31 P 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.
(© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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