Biotemplated synthesis of mesoporous silica for doxycycline removal. Effect of pH, temperature, ionic strength and Ca2+ concentration on the adsorption behaviour

Autores
Brigante, Maximiliano Eduardo; Avena, Marcelo Javier
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Mesoporous silica (SiO2) materials were synthesized in acidic media, using tetraethyl orthosilicate as silica precursor and the water-soluble biopolymer hydroethyl starch (HES) as template, in order to evaluate the effect of temperature synthesis on the morphology and pore structure of synthesized materials. The results show that the mentioned parameters can be tuned by changing the temperature, i.e., from slices with worm-like mesopores of around 5 nm to microporous lamellas when the temperature synthesis increases from 60 °C to 100 °C, respectively. The changes are attributed to a (partial) degradation of the template that hinders the gel formation and disturbs its interaction with the silica species through H-bonds formations and/or electrostatic interactions. The synthesized solids were evaluated as adsorbent of the antibiotic doxycycline (DC) at several values of pH, temperature, ionic strength and Ca2+ concentration. The adsorption of DC strongly increases as pH and ionic strength decrease due to electrostatic attractions and H-bond formations between the functional groups of the antibiotic and the silica active sites. The presence of calcium ions strongly increases the adsorption of DC at pH > 4.4 due to the formation of ternary DC-Ca2+-SiO2 complexes by calcium-bridging. However, Ca2+ concentrations higher than 10-3 M cause the DC precipitation at pH 7 or higher. The analysis of thermodynamic parameters suggests that the adsorption of DC on SiO2 is exothermic and spontaneous in nature. The effect of the tetracycline structure on the adsorption capacity of the synthesized material was also evaluated and discussed.
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
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
Materia
Cation-Bridging
Doxycycline Adsorption
Hydroxyethyl Starch
Mesoporous Silica
Solid-Water Interface
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/54586
Acceder
id CONICETDig_da14b48611445072387cc21cb5f26a2b
oai_identifier_str oai:ri.conicet.gov.ar:11336/54586
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repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Biotemplated synthesis of mesoporous silica for doxycycline removal. Effect of pH, temperature, ionic strength and Ca2+ concentration on the adsorption behaviourBrigante, Maximiliano EduardoAvena, Marcelo JavierCation-BridgingDoxycycline AdsorptionHydroxyethyl StarchMesoporous SilicaSolid-Water Interfacehttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Mesoporous silica (SiO2) materials were synthesized in acidic media, using tetraethyl orthosilicate as silica precursor and the water-soluble biopolymer hydroethyl starch (HES) as template, in order to evaluate the effect of temperature synthesis on the morphology and pore structure of synthesized materials. The results show that the mentioned parameters can be tuned by changing the temperature, i.e., from slices with worm-like mesopores of around 5 nm to microporous lamellas when the temperature synthesis increases from 60 °C to 100 °C, respectively. The changes are attributed to a (partial) degradation of the template that hinders the gel formation and disturbs its interaction with the silica species through H-bonds formations and/or electrostatic interactions. The synthesized solids were evaluated as adsorbent of the antibiotic doxycycline (DC) at several values of pH, temperature, ionic strength and Ca2+ concentration. The adsorption of DC strongly increases as pH and ionic strength decrease due to electrostatic attractions and H-bond formations between the functional groups of the antibiotic and the silica active sites. The presence of calcium ions strongly increases the adsorption of DC at pH > 4.4 due to the formation of ternary DC-Ca2+-SiO2 complexes by calcium-bridging. However, Ca2+ concentrations higher than 10-3 M cause the DC precipitation at pH 7 or higher. The analysis of thermodynamic parameters suggests that the adsorption of DC on SiO2 is exothermic and spontaneous in nature. The effect of the tetracycline structure on the adsorption capacity of the synthesized material was also evaluated and discussed.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; ArgentinaFil: 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; ArgentinaElsevier Science2016-05-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/54586Brigante, Maximiliano Eduardo; Avena, Marcelo Javier; Biotemplated synthesis of mesoporous silica for doxycycline removal. Effect of pH, temperature, ionic strength and Ca2+ concentration on the adsorption behaviour; Elsevier Science; Microporous and Mesoporous Materials; 225; 1-5-2016; 534-5421387-1811CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S1387181116000652info:eu-repo/semantics/altIdentifier/doi/10.1016/j.micromeso.2016.01.035info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:40:25Zoai:ri.conicet.gov.ar:11336/54586instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:40:25.295CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Biotemplated synthesis of mesoporous silica for doxycycline removal. Effect of pH, temperature, ionic strength and Ca2+ concentration on the adsorption behaviour
title Biotemplated synthesis of mesoporous silica for doxycycline removal. Effect of pH, temperature, ionic strength and Ca2+ concentration on the adsorption behaviour
spellingShingle Biotemplated synthesis of mesoporous silica for doxycycline removal. Effect of pH, temperature, ionic strength and Ca2+ concentration on the adsorption behaviour
Brigante, Maximiliano Eduardo
Cation-Bridging
Doxycycline Adsorption
Hydroxyethyl Starch
Mesoporous Silica
Solid-Water Interface
title_short Biotemplated synthesis of mesoporous silica for doxycycline removal. Effect of pH, temperature, ionic strength and Ca2+ concentration on the adsorption behaviour
title_full Biotemplated synthesis of mesoporous silica for doxycycline removal. Effect of pH, temperature, ionic strength and Ca2+ concentration on the adsorption behaviour
title_fullStr Biotemplated synthesis of mesoporous silica for doxycycline removal. Effect of pH, temperature, ionic strength and Ca2+ concentration on the adsorption behaviour
title_full_unstemmed Biotemplated synthesis of mesoporous silica for doxycycline removal. Effect of pH, temperature, ionic strength and Ca2+ concentration on the adsorption behaviour
title_sort Biotemplated synthesis of mesoporous silica for doxycycline removal. Effect of pH, temperature, ionic strength and Ca2+ concentration on the adsorption behaviour
dc.creator.none.fl_str_mv Brigante, Maximiliano Eduardo
Avena, Marcelo Javier
author Brigante, Maximiliano Eduardo
author_facet Brigante, Maximiliano Eduardo
Avena, Marcelo Javier
author_role author
author2 Avena, Marcelo Javier
author2_role author
dc.subject.none.fl_str_mv Cation-Bridging
Doxycycline Adsorption
Hydroxyethyl Starch
Mesoporous Silica
Solid-Water Interface
topic Cation-Bridging
Doxycycline Adsorption
Hydroxyethyl Starch
Mesoporous Silica
Solid-Water Interface
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Mesoporous silica (SiO2) materials were synthesized in acidic media, using tetraethyl orthosilicate as silica precursor and the water-soluble biopolymer hydroethyl starch (HES) as template, in order to evaluate the effect of temperature synthesis on the morphology and pore structure of synthesized materials. The results show that the mentioned parameters can be tuned by changing the temperature, i.e., from slices with worm-like mesopores of around 5 nm to microporous lamellas when the temperature synthesis increases from 60 °C to 100 °C, respectively. The changes are attributed to a (partial) degradation of the template that hinders the gel formation and disturbs its interaction with the silica species through H-bonds formations and/or electrostatic interactions. The synthesized solids were evaluated as adsorbent of the antibiotic doxycycline (DC) at several values of pH, temperature, ionic strength and Ca2+ concentration. The adsorption of DC strongly increases as pH and ionic strength decrease due to electrostatic attractions and H-bond formations between the functional groups of the antibiotic and the silica active sites. The presence of calcium ions strongly increases the adsorption of DC at pH > 4.4 due to the formation of ternary DC-Ca2+-SiO2 complexes by calcium-bridging. However, Ca2+ concentrations higher than 10-3 M cause the DC precipitation at pH 7 or higher. The analysis of thermodynamic parameters suggests that the adsorption of DC on SiO2 is exothermic and spontaneous in nature. The effect of the tetracycline structure on the adsorption capacity of the synthesized material was also evaluated and discussed.
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
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
description Mesoporous silica (SiO2) materials were synthesized in acidic media, using tetraethyl orthosilicate as silica precursor and the water-soluble biopolymer hydroethyl starch (HES) as template, in order to evaluate the effect of temperature synthesis on the morphology and pore structure of synthesized materials. The results show that the mentioned parameters can be tuned by changing the temperature, i.e., from slices with worm-like mesopores of around 5 nm to microporous lamellas when the temperature synthesis increases from 60 °C to 100 °C, respectively. The changes are attributed to a (partial) degradation of the template that hinders the gel formation and disturbs its interaction with the silica species through H-bonds formations and/or electrostatic interactions. The synthesized solids were evaluated as adsorbent of the antibiotic doxycycline (DC) at several values of pH, temperature, ionic strength and Ca2+ concentration. The adsorption of DC strongly increases as pH and ionic strength decrease due to electrostatic attractions and H-bond formations between the functional groups of the antibiotic and the silica active sites. The presence of calcium ions strongly increases the adsorption of DC at pH > 4.4 due to the formation of ternary DC-Ca2+-SiO2 complexes by calcium-bridging. However, Ca2+ concentrations higher than 10-3 M cause the DC precipitation at pH 7 or higher. The analysis of thermodynamic parameters suggests that the adsorption of DC on SiO2 is exothermic and spontaneous in nature. The effect of the tetracycline structure on the adsorption capacity of the synthesized material was also evaluated and discussed.
publishDate 2016
dc.date.none.fl_str_mv 2016-05-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/54586
Brigante, Maximiliano Eduardo; Avena, Marcelo Javier; Biotemplated synthesis of mesoporous silica for doxycycline removal. Effect of pH, temperature, ionic strength and Ca2+ concentration on the adsorption behaviour; Elsevier Science; Microporous and Mesoporous Materials; 225; 1-5-2016; 534-542
1387-1811
CONICET Digital
CONICET
url http://hdl.handle.net/11336/54586
identifier_str_mv Brigante, Maximiliano Eduardo; Avena, Marcelo Javier; Biotemplated synthesis of mesoporous silica for doxycycline removal. Effect of pH, temperature, ionic strength and Ca2+ concentration on the adsorption behaviour; Elsevier Science; Microporous and Mesoporous Materials; 225; 1-5-2016; 534-542
1387-1811
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S1387181116000652
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.micromeso.2016.01.035
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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