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

E Hottes, CO da Silva, GF Bauerfeldt, RN Castro… - … Science and Pollution …, 2022 - Springer
E Hottes, CO da Silva, GF Bauerfeldt, RN Castro, JHC de Lima, LP Camargo…
Environmental Science and Pollution Research, 2022•Springer
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 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 …
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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