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dc.contributor.author
Ortiz Otalvaro, Julian Andres
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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
2023-01-05T23:36:12Z
dc.date.issued
2019-10-27
dc.identifier.citation
Ortiz Otalvaro, Julian Andres; Brigante, Maximiliano Eduardo; Avena, Marcelo Javier; Adsorption of norfloxacin on a hexagonal mesoporous silica: isotherms, kinetics and adsorbent reuse; Springer; Adsorption; 25; 7; 27-10-2019; 1375-1385
dc.identifier.issn
0929-5607
dc.identifier.uri
http://hdl.handle.net/11336/183648
dc.description.abstract
The adsorption of the antibiotic norfloxacin (NFX) on MCM-41 type mesoporous silica has been studied in batch experiments by performing adsorption kinetics and isotherms under different conditions. Regeneration of the adsorbent and reuse studies were also carried out and are discussed. On the one hand, the adsorption is very fast and strongly dependent on pH, increasing from 30.6 µmol g−1 at pH 3.0 to 192.3 µmol g−1 at pH 7.0 and then decreasing up to 29.6 µmol g−1 as pH increases. The adsorption takes place by direct binding of NFX to silica active sites through electrostatic interactions and H-bonds formations, as deduced from adsorption experiments at several ionic strengths and temperatures. The hydrophobic conformation of the antibiotic zwitterion seems to play also a key role on the maximum adsorption at neutral pH. The presence of calcium ions strongly increases the adsorption of NFX at pH > 4.5 due to the formation of ternary NFX-Ca2+-MCM-41 complexes by calcium-bridging. After the first cycle of regeneration through washing using several solvents, the studied solid significantly reduces its removal efficiency—up to 60%—but then it remains constant for another three cycles. The analysis of thermodynamic parameters suggests that the adsorption is exothermic (− 28.8 kJ mol−1) and spontaneous in nature. On the other hand, the capacity of MCM-41 to remove a concentration of the antibiotic commonly-found in water environments is still being too low if it compares with other adsorbents. Improving the silica surface reactivity should be the main goal by the researchers in order to use the material as adsorbent of this kind of molecules in the future.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Springer
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
CATION BRIDGING
dc.subject
HEXAGONAL MESOPOROUS SILICA
dc.subject
HYDROPHOBIC ASSOCIATIONS
dc.subject
NORFLOXACIN ADSORPTION
dc.subject
REUSABLE MATERIAL
dc.subject
SOLID-WATER INTERFACE
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
Adsorption of norfloxacin on a hexagonal mesoporous silica: isotherms, kinetics and adsorbent reuse
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-02-26T20:21:06Z
dc.journal.volume
25
dc.journal.number
7
dc.journal.pagination
1375-1385
dc.journal.pais
Alemania
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dc.journal.ciudad
Berlín
dc.description.fil
Fil: Ortiz Otalvaro, Julian Andres. 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: 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
Adsorption
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs10450-019-00100-x
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1007/s10450-019-00100-x
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