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

Content Provider	Springer Nature Link
Author	Eliodorio, Kevy Pontes Andolfatto, Vitor Seorra Martins, Marco Rulevas Gomes Sá, Bre Pivaro Umeki, Erick Ryoiti Morandim Giannetti, Andreia
Copyright Year	2017
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.
Starting Page	2559
Ending Page	2570
Page Count	12
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	24
Issue Number	6
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2017-03-22
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Wastewater treatment Hexavalent chromium Chitosan Ionic liquids Bioorganic Chemistry Physical Chemistry Organic Chemistry Polymer Sciences Ceramics, Glass, Composites, Natural Materials Sustainable Development
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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