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dc.contributor.author
Onaga Medina, Florencia Micaela
dc.contributor.author
Aguiar, María Belén
dc.contributor.author
Parolo, María Paula
dc.contributor.author
Avena, Marcelo Javier
dc.date.available
2022-05-09T20:00:48Z
dc.date.issued
2021-01-15
dc.identifier.citation
Onaga Medina, Florencia Micaela; Aguiar, María Belén; Parolo, María Paula; Avena, Marcelo Javier; Insights of competitive adsorption on activated carbon of binary caffeine and diclofenac solutions; Academic Press Ltd - Elsevier Science Ltd; Journal of Environmental Management; 278; 15-1-2021; 111523-111532
dc.identifier.issn
0301-4797
dc.identifier.uri
http://hdl.handle.net/11336/156983
dc.description.abstract
A commercial activated carbon (AC), obtained from peanut shells, was characterized and tested as adsorbent forthe removal of the pharmaceutical products caffeine (CF) and diclofenac (DIC), which were used as modelemerging contaminants. Nitrogen adsorption, XRD, SEM, FT-IR spectroscopy, and chemical analyses were typicalof ACs, and Boehm titrations, calculations of surface sites distributions and zeta potential measurements indicated that reactions of deprotonable oxygenated groups at the AC surface lead to an isoelectric point of 3.2. Atheoretical equation derived from the Langmuir isotherm is proposed to explain the adsorption percentage oradsorbed fraction (fads) as a function of the adsorbent dose (D, adsorbent ?concentration?). Good fittings of thefads vs. D curves and the normal adsorption isotherms were obtained with the same Langmuir parameters. Animportant and practical application of this new equation is to permit a straightforward calculation of the soliddose needed to achieve a required adsorption percentage. With the aim of describing the adsorption processes ofCF and DIC and their competition for surface sites under an ample range of concentrations, the adsorption of theemerging contaminants was investigated in single adsorbate experiments and with binary mixtures, and thecompetitive Langmuir model was applied. CF adsorption was high and independent of pH, whereas DICadsorption was high between pH 4 and 6 and showed a continuous decrease from pH 6 to 10.5. The use of thecompetitive Langmuir isotherm for binary mixtures indicated that there was no pure competition between CF andDIC for surface sites. Instead, there was influenced competition, meaning that the presence of one substance at thesurface modified the adsorption parameters of the other, either through lateral interaction forces or by changingthe molecular orientation at the surface. In both cases, one substance favored the adsorption of the other,compared to pure competition.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Academic Press Ltd - Elsevier Science Ltd
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
EMERGING CONTAMINANTS
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INFLUENCED COMPETITION
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SOLID DOSAGE
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WATER TREATMENT
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COMPETITIVE LANGMUIR
dc.subject.classification
Química Orgánica
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Ciencias Químicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Insights of competitive adsorption on activated carbon of binary caffeine and diclofenac solutions
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2021-12-13T19:23:34Z
dc.journal.volume
278
dc.journal.pagination
111523-111532
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: Onaga Medina, Florencia Micaela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Centro de Investigaciones en Toxicología Ambiental y Agrobiotecnología del Comahue. Universidad Nacional del Comahue. Facultad de Ciencias Agrarias. Centro de Investigaciones en Toxicología Ambiental y Agrobiotecnología del Comahue; Argentina
dc.description.fil
Fil: Aguiar, María Belén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Centro de Investigaciones en Toxicología Ambiental y Agrobiotecnología del Comahue. Universidad Nacional del Comahue. Facultad de Ciencias Agrarias. Centro de Investigaciones en Toxicología Ambiental y Agrobiotecnología del Comahue; Argentina
dc.description.fil
Fil: Parolo, María Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Centro de Investigaciones en Toxicología Ambiental y Agrobiotecnología del Comahue. Universidad Nacional del Comahue. Facultad de Ciencias Agrarias. Centro de Investigaciones en Toxicología Ambiental y Agrobiotecnología del Comahue; 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
Journal of Environmental Management
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0301479720314481
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1016/j.jenvman.2020.111523
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