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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

Rede Nordeste de Biotecnologia (RENORBIO), Universidade Estadual do Ceará, Av. Paranjana, 1.700, Campus do Itaperi, 60740-000 Fortaleza, CE, Brazil
Núcleo de Pesquisas em Ciências Ambientais (NPCIAMB), Universidade Católica de Pernambuco, Boa Vista 50 050-590 Recife, PE, Brazil
Departamento de Engenharia Química, Universidade de Vigo, Spain
Departamento de Histologia e Morfologia, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, Cidade Universitária, 50670-901, Recife, PE, Brazil
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 Natural Products)
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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 (CC BY 3.0).

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MDPI and ACS Style

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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