Journal
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
Volume 54, Issue 4, Pages 281-289Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/03601234.2018.1561055
Keywords
Adsorption; picloram; herbicide; clays; XPS; surface complexes
Funding
- Universidad de Buenos Aires (UBA) through UBACyT grant
- Ministerio de Ciencia y Tecnologia, Agencia Nacional de Promocion Cientifica y Tecnologica, Fondo para la Investigacion Cientifica y Tecnologica (MINCyT-ANPCyT-FONCyT) through UBACyT grant
- Universidad de Buenos Aires (UBA) through PICT grant
- Ministerio de Ciencia y Tecnologia, Agencia Nacional de Promocion Cientifica y Tecnologica, Fondo para la Investigacion Cientifica y Tecnologica (MINCyT-ANPCyT-FONCyT) through PICT grant
- CONICET fellowship
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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.
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