New polymeric/inorganic hybrid sorbents based on red mud and nanosized magnetite for large scale applications in As(V) removal

dc.contributor.authorLópez García, Marta
dc.contributor.authorMartínez-Cabanas, María
dc.contributor.authorVilariño, Teresa
dc.contributor.authorLodeiro, Pablo
dc.contributor.authorRodríguez-Barro, Pilar
dc.contributor.authorHerrero, Roberto
dc.contributor.authorBarriada, José L.
dc.date.accessioned2021-04-21T06:16:21Z
dc.date.available2021-04-21T06:16:21Z
dc.date.issued2017-03-01
dc.date.updated2021-04-21T06:16:21Z
dc.description.abstractRed mud (RM), a waste product generated in the industrial production of aluminium, was recovered for a second use as As(V) adsorbent. RM adsorption properties were compared to those obtained with a nanostructured in-lab synthesized iron oxide, magnetite. Operational problems associated with powdery consistency of raw materials were solved with the synthesis of new polymeric/inorganic hybrid sorbents by dispersing red mud and magnetite in chitosan. The behaviour of raw red mud and magnetite towards As(V) adsorption has been critically compared with that observed for the hybrid materials. pH dependence studies demonstrated that near neutral environments favour As(V) elimination. The sorption kinetics for the iron oxides showed that equilibrium was reached in less than 3 h for raw materials and up to 15 h for immobilized red mud and magnetite. The amount of arsenic sorbed on the four different sorbents as a function of the equilibrium arsenic concentration has been fitted to a Freundlich isotherm and a multilayer adsorption mechanism is proposed. Finally, continuous flow experiments were developed using chitosan immobilized red mud. Results allowed selecting batch conformation as the most effective for As(V) removal.
dc.description.sponsorshipAuthors wish to thank Ministerio de Economía y Competitividad for the financial support through the research Project CTM2012-37272, cofounded with FEDER programme.
dc.format.mimetypeapplication/pdf
dc.identifier.doihttps://doi.org/10.1016/j.cej.2016.11.081
dc.identifier.idgrec031195
dc.identifier.issn1385-8947
dc.identifier.urihttp://hdl.handle.net/10459.1/71088
dc.language.isoeng
dc.publisherElsevier
dc.relationinfo:eu-repo/grantAgreement/MINECO//CTM2012-37272/ES/FUNCIONALIZACION DE BIOMASA PARA EL DESARROLLO DE ADSORBENTES APLICADOS AL TRATAMIENTO DE AGUAS/
dc.relation.isformatofVersió postprint del document publicat a: https://doi.org/10.1016/j.cej.2016.11.081
dc.relation.ispartofChemical Engineering Journal, 2017, vol. 311, p. 117-125
dc.rightscc-by-nc-nd, (c) Elsevier, 2016
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es
dc.subjectIron oxides
dc.subjectChitosan-hybrid material
dc.subjectSorption
dc.subjectArsenic
dc.titleNew polymeric/inorganic hybrid sorbents based on red mud and nanosized magnetite for large scale applications in As(V) removal
dc.typeinfo:eu-repo/semantics/article
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
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