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dc.contributor.author
Brigante, Maximiliano Eduardo
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dc.contributor.author
Avena, Marcelo Javier
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dc.date.available
2017-12-12T19:10:52Z
dc.date.issued
2014-03
dc.identifier.citation
Brigante, Maximiliano Eduardo; Avena, Marcelo Javier; Synthesis, characterization and application of a hexagonal mesoporous silica for pesticide removal from aqueous solution; Elsevier Science Inc; Microporous and Mesoporous Materials; 191; 3-2014; 1-9
dc.identifier.issn
1387-1811
dc.identifier.uri
http://hdl.handle.net/11336/30325
dc.description.abstract
A hexagonal mesoporous silica (SiO2) was hydrothermally synthesized in alkaline media by using mixed cationic cetyltrimethylammonium tosylate-non-ionic Pluronic F68 surfactants as template. After characterization by commonly used techniques, the solid was evaluated as adsorbent for the remotion of dicationic herbicide paraquat (PQ2+). The adsorption of the PQ2+ on SiO2 has been studied in batch experiments by performing adsorption isotherms under different conditions of pH, supporting electrolyte concentration, and temperature. Adsorption kinetic on the studied material has also been carried out and discussed. The adsorption of PQ2+ on the studied material is strongly dependent on pH, increasing as pH increases. The adsorption seems to take place by direct binding of the cationic herbicide to SiO2 active sites (e.g. surface and/or inside the mesopores) through electrostatic interactions and outer-sphere (or ionic pair) complexes formations, as deduce from adsorption experiments at several ionic strengths and temperatures. The analysis of thermodynamic parameters suggests that the adsorption of PQ2+ on the studied solid is exothermic and spontaneous in nature. Even after four regeneration cycles through acid washing, the mesoporous material has still a removal efficiency of ca. 75%, showing a promising application for the treatment of wastewater containing paraquat ions.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science Inc
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
Mcm-41
dc.subject
Paraquat Adsorption
dc.subject
Surface Complexes
dc.subject.classification
Otras Ciencias Químicas
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dc.subject.classification
Ciencias Químicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Synthesis, characterization and application of a hexagonal mesoporous silica for pesticide removal from aqueous solution
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-12-12T18:42:44Z
dc.journal.volume
191
dc.journal.pagination
1-9
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Brigante, Maximiliano Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Química del Sur. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; Argentina
dc.description.fil
Fil: Avena, Marcelo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Química del Sur. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; Argentina
dc.journal.title
Microporous and Mesoporous Materials
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.micromeso.2014.02.035
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S1387181114001061
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