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dc.creatorGil Bravo, Antonioes_ES
dc.creatorArrieta Chango, Ekhinees_ES
dc.creatorVicente, Miguel Ángeles_ES
dc.creatorKorili, Sophia A.es_ES
dc.date.accessioned2019-05-22T11:33:25Z
dc.date.available2019-05-22T11:33:25Z
dc.date.issued2018
dc.identifier.issn2470-1343 (Electronic)
dc.identifier.urihttps://hdl.handle.net/2454/33115
dc.description.abstractIn this study, industrial wastes, which remain after aluminum extraction from saline slags, were used as adsorbents. The aluminum saline slags were treated under reflux with 2 mol/dm3 aqueous solutions of NaOH, H2SO4, and HCl for 2 h. After separation by filtration, aqueous solutions containing the extracted aluminum and residual wastes were obtained. The wastes were characterized by nitrogen adsorption at -196 °C, X-ray diffraction, scanning electron microscopy, and ammonia pulse chemisorption. The chemical treatment reduced the specific surface area, from 84 to 23 m2/g, and the pore volume, from 0.136 to 0.052 cm3/g, of the saline slag and increased the ammonia-adsorption capacity from 2.84 to 5.22 cm3/g, in the case of acid-treated solids. The materials were applied for the removal of Acid Orange 7 and Acid Blue 80 from aqueous solutions, considering both single and binary systems. The results showed interesting differences in the adsorption capacity between the samples. The saline slag treated with HCl rapidly adsorbed all of the dyes present in solution, whereas the other materials retained between 50 and 70% of the molecules present in solution. The amount of Acid Orange 7 removed by the nontreated material and by the material treated with NaOH increased in the presence of Acid Blue 80, which can be considered as a synergistic behavior. The CO2 adsorption of the solids at several temperatures up to 200 °C was also evaluated under dry conditions. The aluminum saline slag presented an adsorption capacity higher than the rest of treated samples, a behavior that can be explained by the specific sites of adsorption and the textural properties of the solids. The isosteric heats of CO2 adsorption, determined from the Clausius-Clapeyron equation, varied between 1.7 and 26.8 kJ/mol. The wastes should be used as adsorbents for the selective removal of organic contaminants in wastewater treatment.en
dc.description.sponsorshipThe authors are grateful for the financial support from the Seventh Framework Programme through the project RecycAL, the Spanish Ministry of Economy, Industry, and Competitiveness (AEI/MINECO), and the European Regional Development Fund (ERDF) through project MAT2016-78863-C2-R.en
dc.format.extent10 p.
dc.format.mimetypeapplication/pdfen
dc.language.isoengen
dc.publisherAmerican Chemical Societyen
dc.relation.ispartofACS Omega 2018, 3, 18275−18284en
dc.rights© 2018 American Chemical Society. This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.en
dc.rights.urihttps://pubs.acs.org/page/policy/authorchoice_termsofuse.html/
dc.subjectIndustrial wastesen
dc.subjectAdsorbentsen
dc.subjectAluminum saline slagsen
dc.titleApplication of industrial wastes from chemically treated aluminum saline slags as adsorbentsen
dc.typeinfo:eu-repo/semantics/articleen
dc.typeArtículo / Artikuluaes
dc.contributor.departmentInstitute for Advanced Materials and Mathematics - INAMAT2es_ES
dc.rights.accessRightsinfo:eu-repo/semantics/openAccessen
dc.rights.accessRightsAcceso abierto / Sarbide irekiaes
dc.identifier.doi10.1021/acsomega.8b02397
dc.relation.projectIDinfo:eu-repo/grantAgreement/ES/1PE/MAT2016-78863en
dc.relation.publisherversionhttps://doi.org/10.1021/acsomega.8b02397
dc.type.versioninfo:eu-repo/semantics/publishedVersionen
dc.type.versionVersión publicada / Argitaratu den bertsioaes


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