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Published in: Cellulose 6/2017

22-03-2017 | Original Paper

Treatment of chromium effluent by adsorption on chitosan activated with ionic liquids

Authors: Kevy Pontes Eliodorio, Vitor Seorra Andolfatto, Marco Rulevas Gomes Martins, Breno Pivaro de Sá, Erick Ryoiti Umeki, Andreia de Araújo Morandim-Giannetti

Published in: Cellulose | Issue 6/2017

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Abstract

This study proposes, verifies, and refines the use of biopolymers treated with two new ionic liquids (ILs) (sec-butylammonium acetate and n-octylammonium acetate), as a platform for chromium adsorption. The ILs were synthesized, characterized, and applied to chitosan treatment. Analyzing the size distribution of microparticles of chitosan and chitosan activated with ILs (sec-butylammonium acetate and n-octylammonium acetate), we observed that a little decrease in the particle size occurred with the activation of chitosan (176 ± 0.02 μm to 167 ± 0.054 and 168.5 ± 0.05 μm, respectively), as well as changes in the X-ray diffraction FTIR_ATR spectra. Further studies were performed using the best adsorbent – chitosan treated with sec-butylammonium acetate. In this case, the chromium VI concentration in the sample was reduced by more than 99% when using chitosan treated with IL sec-butylammonium acetate. The best reaction time was determined as 1 h, which allowed a chromium adsorption of 99.1% and the adsorption kinetic data were best represented by the second-order model (k2 = 11.7258 g mg−1 min−1). The maximum adsorption capacity was obtained using the Langmuir isotherm model (20.833 mg g−1 at pH 4 during 1 h, using 1.0 g of chitosan), and the adsorption efficiency was enhanced at 25 °C by the Freundlich isotherm model, in which the constants KF and n were determined as 0.875 mg L−1 and 1.610, respectively.

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Appendix
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Metadata
Title
Treatment of chromium effluent by adsorption on chitosan activated with ionic liquids
Authors
Kevy Pontes Eliodorio
Vitor Seorra Andolfatto
Marco Rulevas Gomes Martins
Breno Pivaro de Sá
Erick Ryoiti Umeki
Andreia de Araújo Morandim-Giannetti
Publication date
22-03-2017
Publisher
Springer Netherlands
Published in
Cellulose / Issue 6/2017
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-017-1264-3

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