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

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 i...

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Bibliographic Details
Published in:Environmental science and pollution research international 2022-11, Vol.29 (55), p.83698-83710
Main Authors: Hottes, Emanoel, da Silva, Clarissa Oliveira, Bauerfeldt, Glauco Favilla, Castro, Rosane Nora, de Lima, Jackson Henrique Cardoso, Camargo, Luan Pereira, Dall’Antonia, Luiz Henrique, Herbst, Marcelo Hawrylak
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Aluminum
Anions
Aquatic Pollution
Aqueous solutions
Atmospheric Protection/Air Quality Control/Air Pollution
Diffusion models
Disease
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental impact
Environmental science
Glyphosate
Herbicides
Hydrogen-Ion Concentration
Investigations
Kinetics
Magnesium
NMR spectroscopy
Oxides - chemistry
Phosphonates
Research Article
Solutions
Spectrum analysis
Thermodynamics
Waste Water Technology
Water
Water Management
Water Pollution Control
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Summary: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.
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-022-21703-y