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dc.contributor.authorAlmeida, Francine Tatiane Rezende de-
dc.contributor.authorFerreira, Bruno Christiano Silva-
dc.contributor.authorMoreira, Ana Luísa da Silva Lage-
dc.contributor.authorFreitas, Rossimiriam Pereira de-
dc.contributor.authorGil, Laurent Frédéric-
dc.contributor.authorGurgel, Leandro Vinícius Alves-
dc.date.accessioned2016-07-29T16:58:16Z-
dc.date.available2016-07-29T16:58:16Z-
dc.date.issued2016-
dc.identifier.citationALMEIDA, F. T. R. de et al. Application of a new bifunctionalized chitosan derivative with zwitterionic characteristics for the adsorption of Cu2+, Co2+, Ni2+, and oxyanions of Cr6+ from aqueous solutions: kinetic and equilibrium aspects. Journal of Colloid and Interface Science, v. 466, p. 297-309, 2016. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0021979715304215>. Acesso em: 16 jun. 2016.pt_BR
dc.identifier.issn0021-9797-
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/6699-
dc.description.abstractThis study describes the synthesis of a new chitosan derivative (C2) with zwitterionic characteristics and its use for the removal of cationic species Cu2+, Co2+, and Ni2+ and anionic species of Cr6+ in a single aqueous solution. The new adsorbent was synthesized by quaternization of the amine group of chitosan and esterification of hydroxyl groups with EDTA dianhydride. These combined reactions gave both cationic and anionic characteristics to C2 with the release of quaternary ammonium groups and carboxylic groups. The capacity of C2 to adsorb Cu2+, Co2+, Ni2+, and oxyanions of Cr6+ was evaluated in a batch process with different contact times, pH values, and initial concentrations. Adsorption isotherms were best fitted to the Langmuir and Sips models. The maximum adsorption capacities (Qmax) of C2 for adsorption of Cu2+, Co2+, Ni2+, and Cr6+ were 0.698, 1.125, 0.725, and 1.910 mmol/g, respectively. The DadsG_ values were in the range from _20 to _28 kJ/mol. These values suggest a mixed mechanism controlling adsorption. Desorption studies using an aqueous solution consisting of 0.1 mol/L HNO3 were carried out. The reusability of the recovered C2 adsorbent after desorption was also evaluated.pt_BR
dc.language.isoen_USpt_BR
dc.rightsabertopt_BR
dc.subjectBifunctionalized chitosanpt_BR
dc.subjectAdsorptionpt_BR
dc.subjectCopperpt_BR
dc.subjectChromiumpt_BR
dc.titleApplication of a new bifunctionalized chitosan derivative with zwitterionic characteristics for the adsorption of Cu2+, Co2+, Ni2+, and oxyanions of Cr6+ from aqueous solutions : kinetic and equilibrium aspects.pt_BR
dc.typeArtigo publicado em periodicopt_BR
dc.rights.licenseO periódico Journal of Colloid and Interface Science concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3898810998669.pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.jcis.2015.12.037-
Appears in Collections:DEQUI - Artigos publicados em periódicos

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