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Molecules 2011, 16(5), 3569-3579; doi:10.3390/molecules16053569

Chromium (VI) Ion Adsorption Features of Chitosan Film and Its Chitosan/Zeolite Conjugate 13X Film

1 Rede Nordeste de Biotecnologia (RENORBIO), Universidade Estadual do Ceará, Av. Paranjana, 1.700, Campus do Itaperi, 60740-000 Fortaleza, CE, Brazil 2 Núcleo de Pesquisas em Ciências Ambientais (NPCIAMB), Universidade Católica de Pernambuco, Boa Vista 50 050-590 Recife, PE, Brazil 3 Departamento de Engenharia Química, Universidade de Vigo, Spain 4 Departamento de Histologia e Morfologia, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, Cidade Universitária, 50670-901, Recife, PE, Brazil 5 Instituto de Biotecnologia e Bioengenharia (IBB), Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal
* Author to whom correspondence should be addressed.
Received: 20 January 2011 / Revised: 21 February 2011 / Accepted: 9 March 2011 / Published: 28 April 2011
(This article belongs to the Section Metabolites)
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This research evaluated the importance of the adsorption properties of chitosan a chitosan/zeolite conjugate film for the removal of Cr(VI) ions from solutions in the 5–260 mg/L concentration range, when the pH was adjusted to 4.0 and 6.0. The uptake capacities of the films formed by chitosan and by the chitosan/zeolite conjugate were calculated by mass balance. The equilibrium isotherms were fitted to the Langmuir, Freundlich and Redlich-Peterson models. The chitosan film seems to be a good sorbent for Cr(VI) at pH 4, but its physical instability suggests the need for a more resilient support. Due to this fact zeolite was added to the chitosan matrix in solution and a chitosan/zeolite (CS/Zeo) film was thus formed. The solubility of the film and the characterization of the different matrices by FTIR, TGA and X-Ray showed that a cross-linked structure was formed between the chitosan and zeolite and the solubility of the film increased. In this study, the low manufacturing cost of the CS/Zeo matrix, the good uptake of Cr(VI) at acidic pH (17.28 mg/g) and the non desorption of Cr(VI) from the film in water suggests this combination should be tested in industrial environment.
Keywords: chitosan; zeolite; chromium; adsorption chitosan; zeolite; chromium; adsorption
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Batista, A.C.L.; Villanueva, E.R.; Amorim, R.V.S.; Tavares, M.T.; Campos-Takaki, G.M. Chromium (VI) Ion Adsorption Features of Chitosan Film and Its Chitosan/Zeolite Conjugate 13X Film. Molecules 2011, 16, 3569-3579.

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