Selective modification of clay minerals for the adsorption of herbicides widely used in olive groves
Ground and surface water contamination by herbicides applied to olive groves in Spain and other Mediterranean countries is demanding strategies to prevent and remediate the environmental problems repeatedly caused by such herbicides. In this study, six different organic cations (L-carnitine, spermine, hexadimethrine, tyramine, phenyltrimethylammonium, and hexadecyltrimethylammonium) were incorporated into Na-rich Wyoming montmorillonite (SWy-2) and Ca-rich Arizona montmorillonite (SAz-1) at two different loadings (50% and 100% of the cation exchange capacity of the clays) as a strategy to enhance the affinity of the clay minerals for three herbicides widely used in olive groves: terbuthylazine, diuron, and MCPA. The modified montmorillonites were characterized and tested as adsorbents of the herbicides through batch adsorption tests. At the experimental conditions used, some of the modified montmorillonites removed more than 95% of the herbicide initially present in aqueous solution, whereas the unmodified clays removed less than 15%. All three herbicides displayed very strong affinities for SAz-1 exchanged with hexadecyltrimethylammonium cations, particularly when these were incorporated at 100% of the cation exchange capacity of the clay mineral. Terbuthylazine and diuron also displayed very strong affinities for SWy-2 exchanged with L-carnitine and spermine, respectively. The chemical characteristics of the organic cation greatly influenced the adsorptive properties of the resultant organoclay. The herbicides were in general reversibly adsorbed by the modified clays. The results indicate that some of the tested modified clays could be suitable for the removal of the assayed herbicides from contaminated water and also as possible supports for the design of slow release formulations of such herbicides to attenuate their environmental impact when used in high-risk scenarios such as olive groves.
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2007
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dig-irnas-es-10261-610472018-09-10T10:28:51Z Selective modification of clay minerals for the adsorption of herbicides widely used in olive groves Celis, R. Trigo, Carmen Facenda, G. Hermosín, M.C. Cornejo, J. Ground and surface water contamination by herbicides applied to olive groves in Spain and other Mediterranean countries is demanding strategies to prevent and remediate the environmental problems repeatedly caused by such herbicides. In this study, six different organic cations (L-carnitine, spermine, hexadimethrine, tyramine, phenyltrimethylammonium, and hexadecyltrimethylammonium) were incorporated into Na-rich Wyoming montmorillonite (SWy-2) and Ca-rich Arizona montmorillonite (SAz-1) at two different loadings (50% and 100% of the cation exchange capacity of the clays) as a strategy to enhance the affinity of the clay minerals for three herbicides widely used in olive groves: terbuthylazine, diuron, and MCPA. The modified montmorillonites were characterized and tested as adsorbents of the herbicides through batch adsorption tests. At the experimental conditions used, some of the modified montmorillonites removed more than 95% of the herbicide initially present in aqueous solution, whereas the unmodified clays removed less than 15%. All three herbicides displayed very strong affinities for SAz-1 exchanged with hexadecyltrimethylammonium cations, particularly when these were incorporated at 100% of the cation exchange capacity of the clay mineral. Terbuthylazine and diuron also displayed very strong affinities for SWy-2 exchanged with L-carnitine and spermine, respectively. The chemical characteristics of the organic cation greatly influenced the adsorptive properties of the resultant organoclay. The herbicides were in general reversibly adsorbed by the modified clays. The results indicate that some of the tested modified clays could be suitable for the removal of the assayed herbicides from contaminated water and also as possible supports for the design of slow release formulations of such herbicides to attenuate their environmental impact when used in high-risk scenarios such as olive groves. Peer Reviewed 2012-11-25T18:39:15Z 2012-11-25T18:39:15Z 2007 2012-11-25T18:39:16Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1021/jf070709q issn: 0021-8561 e-issn: 1520-5118 Journal of Agricultural and Food Chemistry 55(16): 6650-6658 (2007) http://hdl.handle.net/10261/61047 10.1021/jf070709q en none American Chemical Society |
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Ground and surface water contamination by herbicides applied to olive groves in Spain and other Mediterranean countries is demanding strategies to prevent and remediate the environmental problems repeatedly caused by such herbicides. In this study, six different organic cations (L-carnitine, spermine, hexadimethrine, tyramine, phenyltrimethylammonium, and hexadecyltrimethylammonium) were incorporated into Na-rich Wyoming montmorillonite (SWy-2) and Ca-rich Arizona montmorillonite (SAz-1) at two different loadings (50% and 100% of the cation exchange capacity of the clays) as a strategy to enhance the affinity of the clay minerals for three herbicides widely used in olive groves: terbuthylazine, diuron, and MCPA. The modified montmorillonites were characterized and tested as adsorbents of the herbicides through batch adsorption tests. At the experimental conditions used, some of the modified montmorillonites removed more than 95% of the herbicide initially present in aqueous solution, whereas the unmodified clays removed less than 15%. All three herbicides displayed very strong affinities for SAz-1 exchanged with hexadecyltrimethylammonium cations, particularly when these were incorporated at 100% of the cation exchange capacity of the clay mineral. Terbuthylazine and diuron also displayed very strong affinities for SWy-2 exchanged with L-carnitine and spermine, respectively. The chemical characteristics of the organic cation greatly influenced the adsorptive properties of the resultant organoclay. The herbicides were in general reversibly adsorbed by the modified clays. The results indicate that some of the tested modified clays could be suitable for the removal of the assayed herbicides from contaminated water and also as possible supports for the design of slow release formulations of such herbicides to attenuate their environmental impact when used in high-risk scenarios such as olive groves. |
format |
artículo |
author |
Celis, R. Trigo, Carmen Facenda, G. Hermosín, M.C. Cornejo, J. |
spellingShingle |
Celis, R. Trigo, Carmen Facenda, G. Hermosín, M.C. Cornejo, J. Selective modification of clay minerals for the adsorption of herbicides widely used in olive groves |
author_facet |
Celis, R. Trigo, Carmen Facenda, G. Hermosín, M.C. Cornejo, J. |
author_sort |
Celis, R. |
title |
Selective modification of clay minerals for the adsorption of herbicides widely used in olive groves |
title_short |
Selective modification of clay minerals for the adsorption of herbicides widely used in olive groves |
title_full |
Selective modification of clay minerals for the adsorption of herbicides widely used in olive groves |
title_fullStr |
Selective modification of clay minerals for the adsorption of herbicides widely used in olive groves |
title_full_unstemmed |
Selective modification of clay minerals for the adsorption of herbicides widely used in olive groves |
title_sort |
selective modification of clay minerals for the adsorption of herbicides widely used in olive groves |
publisher |
American Chemical Society |
publishDate |
2007 |
url |
http://hdl.handle.net/10261/61047 |
work_keys_str_mv |
AT celisr selectivemodificationofclaymineralsfortheadsorptionofherbicideswidelyusedinolivegroves AT trigocarmen selectivemodificationofclaymineralsfortheadsorptionofherbicideswidelyusedinolivegroves AT facendag selectivemodificationofclaymineralsfortheadsorptionofherbicideswidelyusedinolivegroves AT hermosinmc selectivemodificationofclaymineralsfortheadsorptionofherbicideswidelyusedinolivegroves AT cornejoj selectivemodificationofclaymineralsfortheadsorptionofherbicideswidelyusedinolivegroves |
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1777664439089102848 |