Artículo

Maqueda, C.; Dos Santos Afonso, M.; Morillo, E.; Torres Sánchez, R.M.; Perez-Sayago, M.; Undabeytia, T. "Adsorption of diuron on mechanically and thermally treated montmorillonite and sepiolite" (2013) Applied Clay Science. 72:175-183
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Abstract:

The effects on montmorillonite (Mt) and on sepiolite (Sep) of mechanical (60 and 180. s grinding time) and further thermal treatments (TT) at 500. °C during 24. h, for removing diuron from aqueous solutions were evaluated. The adsorbents and complexes formed were characterised. The specific surface area (SSA), SEM, XRD and zeta potential of the clay mineral samples were determined. The SSA values showed an increase of 50% for ground Mt and a slight decrease for ground Sep. TT reduced SSA by 50% for the Sep samples, but similar values remained for the Mt samples. Both minerals showed a decrease in crystallinity with increasing grinding time and TT. The zeta potential showed an increased of the negative surface charge for the Mt ground samples, but no changes were noticed for the Sep ground samples. The Mt-TT samples showed a slight decrease whilst the Sep samples showed an increase of the negative surface charge in comparison to those without thermal treatment. The adsorption of diuron on Mt was lower than on Sep, and it decreased slightly after 60 and/or 180. s of grinding, despite the larger SSA values. This differences on the adsorption extent were probably due to the increased micropore surface. In contrast, thermal activation caused significantly increased adsorption, especially for the 180-s ground sample that was inversely correlated with the micropore surface, indicating that diuron was not adsorbed in micropores. Diuron adsorption on Sep was higher than on Mt due to its higher SSA. The adsorption capacity of Sep samples was increased by mechanical treatments (ground and sonicated). Moreover, thermal activation led to additional increases in adsorption probably due to changes in the Sep structure by the loss of OH structural groups leading to a more hydrophobic surface. Diuron adsorption on Mt-TT samples produced an increase in the negative surface charge compared to the original sample, whereas a decrease in the negative surface charge was observed for Sep. © 2012 Elsevier B.V.

Registro:

Documento: Artículo
Título:Adsorption of diuron on mechanically and thermally treated montmorillonite and sepiolite
Autor:Maqueda, C.; Dos Santos Afonso, M.; Morillo, E.; Torres Sánchez, R.M.; Perez-Sayago, M.; Undabeytia, T.
Filiación:Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS-CSIC), Apartado 1052, Sevilla, Spain
INQUIMAE y DQIAQF, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, C1428EHA, Buenos Aires, Argentina
CETMIC, CC 49, (B1896ZCA) M.B. Gonnet, Provincia de Buenos Aires, Argentina
Palabras clave:Adsorption; Diuron; Mechanical treatment; Montmorillonite; Sepiolite; Thermal treatment; Adsorption capacities; Diuron; Hydrophobic surfaces; Mechanical treatments; Montmorillonites (Mt); Negative surface charges; Sepiolite; Specific surface area (SSA); Adsorption; Clay minerals; Grinding (machining); Heat treatment; Microporosity; Surface charge; Surface chemistry; Urea; Zeta potential; Herbicides; adsorption; aqueous solution; crystallinity; diuron; heating; montmorillonite; sepiolite; surface area
Año:2013
Volumen:72
Página de inicio:175
Página de fin:183
DOI: http://dx.doi.org/10.1016/j.clay.2012.10.017
Título revista:Applied Clay Science
Título revista abreviado:Appl. Clay Sci.
ISSN:01691317
CODEN:ACLSE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01691317_v72_n_p175_Maqueda

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Citas:

---------- APA ----------
Maqueda, C., Dos Santos Afonso, M., Morillo, E., Torres Sánchez, R.M., Perez-Sayago, M. & Undabeytia, T. (2013) . Adsorption of diuron on mechanically and thermally treated montmorillonite and sepiolite. Applied Clay Science, 72, 175-183.
http://dx.doi.org/10.1016/j.clay.2012.10.017
---------- CHICAGO ----------
Maqueda, C., Dos Santos Afonso, M., Morillo, E., Torres Sánchez, R.M., Perez-Sayago, M., Undabeytia, T. "Adsorption of diuron on mechanically and thermally treated montmorillonite and sepiolite" . Applied Clay Science 72 (2013) : 175-183.
http://dx.doi.org/10.1016/j.clay.2012.10.017
---------- MLA ----------
Maqueda, C., Dos Santos Afonso, M., Morillo, E., Torres Sánchez, R.M., Perez-Sayago, M., Undabeytia, T. "Adsorption of diuron on mechanically and thermally treated montmorillonite and sepiolite" . Applied Clay Science, vol. 72, 2013, pp. 175-183.
http://dx.doi.org/10.1016/j.clay.2012.10.017
---------- VANCOUVER ----------
Maqueda, C., Dos Santos Afonso, M., Morillo, E., Torres Sánchez, R.M., Perez-Sayago, M., Undabeytia, T. Adsorption of diuron on mechanically and thermally treated montmorillonite and sepiolite. Appl. Clay Sci. 2013;72:175-183.
http://dx.doi.org/10.1016/j.clay.2012.10.017