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Adsorption of picloram on clays nontronite, illite and kaolinite: equilibrium and herbicide-clays surface complexes

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Marco-Brown, Jose L. Gaigneaux, Eric M. [UCL] Torres Sánchez, Rosa M. dos Santos Afonso, María

The picloram (PCM) adsorption on nontronite, illite and kaolinite was studied at pH 3, 5 and 7. The adsorption isotherms had well-fitted to Langmuir and Freundlich models equations. The interactions of PCM with the clay mineral surfaces exhibited an anionic profile adsorption, with a decrease in adsorption when the pH increases. The PCM adsorption capacity increases in the following order: kaolinite < illite < nontronite. The X-ray diffraction (XRD) analysis of PCM-clay samples revealed that the picloram molecule does not enter into the clays basal space. The interaction of PCM with clays surface sites through nitrogen of the pyridine ring was confirmed by X-ray photoelectron spectroscopy (XPS). Due to the anionic form of PCM, the adsorption onto the external and edges surface sites of the clay minerals was proposed.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2018
Language Anglais
Journal information "Journal of Environmental Science and Health, Part B" - p. 1-9 (2018)
Peer reviewed yes
Publisher Informa UK Limited
issn 0360-1234
e-issn 1532-4109
Publication status Publié
Affiliation UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity
Keywords Adsorption ; picloram ; herbicide ; clays ; XPS ; surface complexes
Links
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Bibliographic reference Marco-Brown, Jose L. ; Gaigneaux, Eric M. ; Torres Sánchez, Rosa M. ; dos Santos Afonso, María. Adsorption of picloram on clays nontronite, illite and kaolinite: equilibrium and herbicide-clays surface complexes. In: Journal of Environmental Science and Health, Part B, p. 1-9 (2018)
Permanent URL http://hdl.handle.net/2078.1/213562