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Modeling of Hexavalent Chromium Removal with Hydrophobically Modified Cellulose Nanofibers

dc.contributor.authorOjembarrena Jiménez, Francisco De Borja
dc.contributor.authorSánchez Salvador, José Luis
dc.contributor.authorMateo, Sergio
dc.contributor.authorBalea Martín, Ana
dc.contributor.authorBlanco Suárez, María Ángeles
dc.contributor.authorMerayo Cuevas, Noemí
dc.contributor.authorNegro Álvarez, Carlos Manuel
dc.date.accessioned2023-06-22T11:13:01Z
dc.date.available2023-06-22T11:13:01Z
dc.date.issued2022
dc.description.abstractCellulose nanofibers (CNF) are sustainable nanomaterials, obtained by the mechanical disintegration of cellulose, whose properties make them an interesting adsorbent material due to their high specific area and active groups. CNF are easily functionalized to optimize the performance for different uses. The hypothesis of this work is that hydrophobization can be used to improve their ability as adsorbents. Therefore, hydrophobic CNF was applied to adsorb hexavalent chromium from wastewater. CNF was synthetized by TEMPO-mediated oxidation, followed by mechanical disintegration. Hydrophobization was performed using methyl trimetoxysilane (MTMS) as a hydrophobic coating agent. The adsorption treatment of hexavalent chromium with hydrophobic CNF was optimized by studying the influence of contact time, MTMS dosage (0–3 mmol·g −1 CNF), initial pH of the wastewater (3–9), initial chromium concentration (0.10–50 mg·L −1 ), and adsorbent dosage (250–1000 mg CNF·L −1 ). Furthermore, the corresponding adsorption mechanism was identified. Complete adsorption of hexavalent chromium was achieved with CNF hydrophobized with 1.5 mmol MTMS·g −1 CNF with the faster adsorption kinetic, which proved the initial hypothesis that hydrophobic CNF improves the adsorption capacity of hydrophilic CNF. The optimal adsorption conditions were pH 3 and the adsorbent dosage was over 500 mg·L −1 . The maximum removal was found for the initial concentrations of hexavalent chromium below 1 mg·L −1 and a maximum adsorption capacity of 70.38 mg·g −1 was achieved. The kinetic study revealed that pseudo-second order kinetics was the best fitting model at a low concentration while the intraparticle diffusion model fit better for higher concentrations, describing a multi-step mechanism of hexavalent chromium onto the adsorbent surface. The Freundlich isotherm was the best adjustment model.
dc.description.departmentDepto. de Ingeniería Química y de Materiales
dc.description.facultyFac. de Ciencias Químicas
dc.description.refereedTRUE
dc.description.sponsorshipComunidad de Madrid
dc.description.sponsorshipMinisterio de Economía y Competitividad (España)
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/78174
dc.identifier.citationOjembarrena, Francisco De Borja, et al. «Modeling of Hexavalent Chromium Removal with Hydrophobically Modified Cellulose Nanofibers». Polymers, vol. 14, n.o 16, agosto de 2022, p. 3425. DOI.org (Crossref), https://doi.org/10.3390/polym14163425.
dc.identifier.doi10.3390/polym14163425
dc.identifier.issn2073-4360
dc.identifier.officialurlhttps://doi.org/10.3390/polym14163425
dc.identifier.urihttps://hdl.handle.net/20.500.14352/72216
dc.journal.titlePolymers
dc.language.isoeng
dc.publisherMDPI
dc.relation.hasversionVoR
dc.relation.projectIDproject S2018/EMT-4459 (RETO-PROSOST-CM)
dc.relation.projectIDproject CTQ2017-85654-C2-2-R and predoctoral fellowship PRE2018-085034.
dc.rightsAtribución 3.0 España
dc.rights.accessRightsopen access
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/es/
dc.subject.cdu66.0
dc.subject.keywordWastewater treatment
dc.subject.keywordAdsorption
dc.subject.keywordNanocellulose
dc.subject.keywordCellulose nanofibers
dc.subject.keywordHexavalent chromium
dc.subject.keywordHydrophobization process
dc.subject.ucmIndustria del papel
dc.subject.ucmIngeniería química
dc.subject.unesco3312.13 Tecnología de la Madera
dc.subject.unesco3303 Ingeniería y Tecnología Químicas
dc.titleModeling of Hexavalent Chromium Removal with Hydrophobically Modified Cellulose Nanofibers
dc.typejournal article
dc.volume.number14
dspace.entity.typePublication
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relation.isAuthorOfPublication9dc61dce-9083-4e3d-81d7-90525019e1cb
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relation.isAuthorOfPublication04f905d2-6294-4530-9d01-062828ddefb2
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relation.isAuthorOfPublication.latestForDiscoverybcadd696-bb9b-41cf-a86f-6aa46dba0bc4

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