Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/6699
Title: 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.
Authors: Almeida, Francine Tatiane Rezende de
Ferreira, Bruno Christiano Silva
Moreira, Ana Luísa da Silva Lage
Freitas, Rossimiriam Pereira de
Gil, Laurent Frédéric
Gurgel, Leandro Vinícius Alves
Keywords: Bifunctionalized chitosan
Adsorption
Copper
Chromium
Issue Date: 2016
Citation: ALMEIDA, 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.
Abstract: This 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.
URI: http://www.repositorio.ufop.br/handle/123456789/6699
metadata.dc.identifier.doi: https://doi.org/10.1016/j.jcis.2015.12.037
ISSN: 0021-9797
metadata.dc.rights.license: O periódico Journal of Colloid and Interface Science concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3898810998669.
Appears in Collections:DEQUI - Artigos publicados em periódicos

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