Fe-pillared clay mineral-based formulations of imazaquin for reduced leaching in soil

Slow release formulations of the herbicide imazaquin (2-(4-isopropyl-4-methyl-5-oxo-4,5-dihydro-1H-imidazol-2-yl)quinoline-3-carboxylic acid) were prepared by its adsorption on Fe-pillared clay minerals (Fe PILCs). Fe PILCs were synthesized by the reaction of Na+-montmorillonite (SWy-2) with base-hy...

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Autores: Undabeytia, Tomás, Galán Jiménez, M. C., Gómez-Pantoja Cabezas, María Eulalia, Vázquez Cabello, Juan, Casal, B., Bergaya, F., Morillo, E.
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2013
País:España
Recursos:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/134256
Acesso em linha:https://hdl.handle.net/11441/134256
https://doi.org/10.1016/j.clay.2013.07.001
Access Level:acceso abierto
Palavra-chave:Controlled release formulation
Cyclodextrin
Herbicide
Imazaquin
Montmorillonite
Pillared clay
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repository_id_str
spelling Fe-pillared clay mineral-based formulations of imazaquin for reduced leaching in soilUndabeytia, TomásGalán Jiménez, M. C.Gómez-Pantoja Cabezas, María EulaliaVázquez Cabello, JuanCasal, B.Bergaya, F.Morillo, E.Controlled release formulationCyclodextrinHerbicideImazaquinMontmorillonitePillared claySlow release formulations of the herbicide imazaquin (2-(4-isopropyl-4-methyl-5-oxo-4,5-dihydro-1H-imidazol-2-yl)quinoline-3-carboxylic acid) were prepared by its adsorption on Fe-pillared clay minerals (Fe PILCs). Fe PILCs were synthesized by the reaction of Na+-montmorillonite (SWy-2) with base-hydrolyzed solutions of Fe and Al. The Fe/(Fe+Al) ratios used were 0, 0.05, 0.15 and 0.50. Fe PILCs showed basal spacing values of 5.2 and 1.8nm which were due to iron clusters between delaminated clay layers, and intercalated aluminum polyoxocations, respectively. As iron content increased, the pillaring process yielded PILC with lower microporosity and larger mesoporosity. The affinity of imazaquin on Fe PILCs was very high relative to Al PILC, as revealed in its higher herbicide adsorption values and lower desorption percents. Competitive adsorption of anions such as sulfate, phosphate and chloride provided evidence of formation of inner sphere complexes of imazaquin on Fe PILCs. Slow release formulations were prepared by enhanced adsorption of the herbicide from imazaquin-cyclodextrin (CD) complexes in solution. CDs were able to enhance up to 8.5-fold the solubility of imazaquin, by the formation of inclusion complexes where the quinolinic moiety of the herbicide was partially trapped within the CD cavity. Release of the herbicide in sandy soil was about 1/2-fold lower from Fe PILC formulations relative to the commercial formulation.Ministerio de Educación y Ciencia CTM2009-07425Junta de Andalucía P09-RNM4581ElsevierQuímica OrgánicaFarmacia y Tecnología FarmacéuticaMinisterio de Educación y Ciencia (MEC). EspañaJunta de Andalucía2013info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/134256https://doi.org/10.1016/j.clay.2013.07.001reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésApplied Clay Science, 80-81, 382-389.CTM2009-07425P09-RNM4581https://doi.org/10.1016/j.clay.2013.07.001info:eu-repo/semantics/openAccessoai:idus.us.es:11441/1342562026-06-17T12:51:07Z
dc.title.none.fl_str_mv Fe-pillared clay mineral-based formulations of imazaquin for reduced leaching in soil
title Fe-pillared clay mineral-based formulations of imazaquin for reduced leaching in soil
spellingShingle Fe-pillared clay mineral-based formulations of imazaquin for reduced leaching in soil
Undabeytia, Tomás
Controlled release formulation
Cyclodextrin
Herbicide
Imazaquin
Montmorillonite
Pillared clay
title_short Fe-pillared clay mineral-based formulations of imazaquin for reduced leaching in soil
title_full Fe-pillared clay mineral-based formulations of imazaquin for reduced leaching in soil
title_fullStr Fe-pillared clay mineral-based formulations of imazaquin for reduced leaching in soil
title_full_unstemmed Fe-pillared clay mineral-based formulations of imazaquin for reduced leaching in soil
title_sort Fe-pillared clay mineral-based formulations of imazaquin for reduced leaching in soil
dc.creator.none.fl_str_mv Undabeytia, Tomás
Galán Jiménez, M. C.
Gómez-Pantoja Cabezas, María Eulalia
Vázquez Cabello, Juan
Casal, B.
Bergaya, F.
Morillo, E.
author Undabeytia, Tomás
author_facet Undabeytia, Tomás
Galán Jiménez, M. C.
Gómez-Pantoja Cabezas, María Eulalia
Vázquez Cabello, Juan
Casal, B.
Bergaya, F.
Morillo, E.
author_role author
author2 Galán Jiménez, M. C.
Gómez-Pantoja Cabezas, María Eulalia
Vázquez Cabello, Juan
Casal, B.
Bergaya, F.
Morillo, E.
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Química Orgánica
Farmacia y Tecnología Farmacéutica
Ministerio de Educación y Ciencia (MEC). España
Junta de Andalucía
dc.subject.none.fl_str_mv Controlled release formulation
Cyclodextrin
Herbicide
Imazaquin
Montmorillonite
Pillared clay
topic Controlled release formulation
Cyclodextrin
Herbicide
Imazaquin
Montmorillonite
Pillared clay
description Slow release formulations of the herbicide imazaquin (2-(4-isopropyl-4-methyl-5-oxo-4,5-dihydro-1H-imidazol-2-yl)quinoline-3-carboxylic acid) were prepared by its adsorption on Fe-pillared clay minerals (Fe PILCs). Fe PILCs were synthesized by the reaction of Na+-montmorillonite (SWy-2) with base-hydrolyzed solutions of Fe and Al. The Fe/(Fe+Al) ratios used were 0, 0.05, 0.15 and 0.50. Fe PILCs showed basal spacing values of 5.2 and 1.8nm which were due to iron clusters between delaminated clay layers, and intercalated aluminum polyoxocations, respectively. As iron content increased, the pillaring process yielded PILC with lower microporosity and larger mesoporosity. The affinity of imazaquin on Fe PILCs was very high relative to Al PILC, as revealed in its higher herbicide adsorption values and lower desorption percents. Competitive adsorption of anions such as sulfate, phosphate and chloride provided evidence of formation of inner sphere complexes of imazaquin on Fe PILCs. Slow release formulations were prepared by enhanced adsorption of the herbicide from imazaquin-cyclodextrin (CD) complexes in solution. CDs were able to enhance up to 8.5-fold the solubility of imazaquin, by the formation of inclusion complexes where the quinolinic moiety of the herbicide was partially trapped within the CD cavity. Release of the herbicide in sandy soil was about 1/2-fold lower from Fe PILC formulations relative to the commercial formulation.
publishDate 2013
dc.date.none.fl_str_mv 2013
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/11441/134256
https://doi.org/10.1016/j.clay.2013.07.001
url https://hdl.handle.net/11441/134256
https://doi.org/10.1016/j.clay.2013.07.001
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Applied Clay Science, 80-81, 382-389.
CTM2009-07425
P09-RNM4581
https://doi.org/10.1016/j.clay.2013.07.001
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:idUS. Depósito de Investigación de la Universidad de Sevilla
instname:Universidad de Sevilla (US)
instname_str Universidad de Sevilla (US)
reponame_str idUS. Depósito de Investigación de la Universidad de Sevilla
collection idUS. Depósito de Investigación de la Universidad de Sevilla
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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