Slow-release formulations of the herbicide picloram by using Fe–Al pillared montmorillonite

Slow-release formulations of the herbicide picloram (PCM, 4-amino-3,5,6-trichloropyridine-2-carboxylic acid) were designed based on its adsorption on pillared clays (pillared clays (PILCs)) for reducing the water-polluting risk derived from its use in conventional formulations. Fe–Al PILCs were synt...

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Autor principal:	Brown, José Luis Marco
Publicado:	2017
Materias:	Adsorption Fe–Al pillared montmorillonite Picloram Slow-release formulations adsorption anion herbicide hydrolysis montmorillonite pesticide residue sandy soil water pollution aluminum silicate bentonite clay picloram Aluminum Silicates Bentonite Herbicides
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09441344_v24_n11_p10410_MarcoBrown http://hdl.handle.net/20.500.12110/paper_09441344_v24_n11_p10410_MarcoBrown
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_09441344_v24_n11_p10410_MarcoBrown
record_format	dspace
spelling	paper:paper_09441344_v24_n11_p10410_MarcoBrown2023-06-08T15:53:41Z Slow-release formulations of the herbicide picloram by using Fe–Al pillared montmorillonite Brown, José Luis Marco Adsorption Fe–Al pillared montmorillonite Picloram Slow-release formulations adsorption anion herbicide hydrolysis montmorillonite pesticide residue sandy soil water pollution aluminum silicate bentonite clay herbicide picloram adsorption Adsorption Aluminum Silicates Bentonite Herbicides Picloram Slow-release formulations of the herbicide picloram (PCM, 4-amino-3,5,6-trichloropyridine-2-carboxylic acid) were designed based on its adsorption on pillared clays (pillared clays (PILCs)) for reducing the water-polluting risk derived from its use in conventional formulations. Fe–Al 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 0.15 and 0.50. The PCM adsorption isotherms on Fe–Al PILCs were well fitted to Langmuir and Freundlich models. The PCM adsorption capacity depended on the Fe content in the PILCs. Slow-release formulations were prepared by enhanced adsorption of the herbicide from PCM-cyclodextrin (CD) complexes in solution. CDs were able to enhance up to 2.5-fold the solubility of PCM by the formation of inclusion complexes where the ring moiety of the herbicide was partially trapped within the CD cavity. Competitive adsorption of anions such as sulfate, phosphate, and chloride as well as the FTIR analysis of PCM-PILC complexes provided evidence of formation of inner sphere complexes of PCM-CD on Fe–Al PILCs. Release of the herbicide in a sandy soil was lower from Fe–Al PILC formulations relative to a PCM commercial formulation. © 2017, Springer-Verlag Berlin Heidelberg. Fil:Marco-Brown, J.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09441344_v24_n11_p10410_MarcoBrown http://hdl.handle.net/20.500.12110/paper_09441344_v24_n11_p10410_MarcoBrown
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Adsorption Fe–Al pillared montmorillonite Picloram Slow-release formulations adsorption anion herbicide hydrolysis montmorillonite pesticide residue sandy soil water pollution aluminum silicate bentonite clay herbicide picloram adsorption Adsorption Aluminum Silicates Bentonite Herbicides Picloram
spellingShingle	Adsorption Fe–Al pillared montmorillonite Picloram Slow-release formulations adsorption anion herbicide hydrolysis montmorillonite pesticide residue sandy soil water pollution aluminum silicate bentonite clay herbicide picloram adsorption Adsorption Aluminum Silicates Bentonite Herbicides Picloram Brown, José Luis Marco Slow-release formulations of the herbicide picloram by using Fe–Al pillared montmorillonite
topic_facet	Adsorption Fe–Al pillared montmorillonite Picloram Slow-release formulations adsorption anion herbicide hydrolysis montmorillonite pesticide residue sandy soil water pollution aluminum silicate bentonite clay herbicide picloram adsorption Adsorption Aluminum Silicates Bentonite Herbicides Picloram
description	Slow-release formulations of the herbicide picloram (PCM, 4-amino-3,5,6-trichloropyridine-2-carboxylic acid) were designed based on its adsorption on pillared clays (pillared clays (PILCs)) for reducing the water-polluting risk derived from its use in conventional formulations. Fe–Al 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 0.15 and 0.50. The PCM adsorption isotherms on Fe–Al PILCs were well fitted to Langmuir and Freundlich models. The PCM adsorption capacity depended on the Fe content in the PILCs. Slow-release formulations were prepared by enhanced adsorption of the herbicide from PCM-cyclodextrin (CD) complexes in solution. CDs were able to enhance up to 2.5-fold the solubility of PCM by the formation of inclusion complexes where the ring moiety of the herbicide was partially trapped within the CD cavity. Competitive adsorption of anions such as sulfate, phosphate, and chloride as well as the FTIR analysis of PCM-PILC complexes provided evidence of formation of inner sphere complexes of PCM-CD on Fe–Al PILCs. Release of the herbicide in a sandy soil was lower from Fe–Al PILC formulations relative to a PCM commercial formulation. © 2017, Springer-Verlag Berlin Heidelberg.
author	Brown, José Luis Marco
author_facet	Brown, José Luis Marco
author_sort	Brown, José Luis Marco
title	Slow-release formulations of the herbicide picloram by using Fe–Al pillared montmorillonite
title_short	Slow-release formulations of the herbicide picloram by using Fe–Al pillared montmorillonite
title_full	Slow-release formulations of the herbicide picloram by using Fe–Al pillared montmorillonite
title_fullStr	Slow-release formulations of the herbicide picloram by using Fe–Al pillared montmorillonite
title_full_unstemmed	Slow-release formulations of the herbicide picloram by using Fe–Al pillared montmorillonite
title_sort	slow-release formulations of the herbicide picloram by using fe–al pillared montmorillonite
publishDate	2017
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09441344_v24_n11_p10410_MarcoBrown http://hdl.handle.net/20.500.12110/paper_09441344_v24_n11_p10410_MarcoBrown
work_keys_str_mv	AT brownjoseluismarco slowreleaseformulationsoftheherbicidepiclorambyusingfealpillaredmontmorillonite
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Slow-release formulations of the herbicide picloram by using Fe–Al pillared montmorillonite

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