Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 411, Issue -, Pages 27-33Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2013.08.051
Keywords
Adsorption; Amaranth; Chitosan films; Desorption; Tartrazine
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Funding
- CAPES (Brazilian Agency for Improvement of Higher Education Personnel)
- CNPq (National Council for Scientific and Technological Development)
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Chitosan films (CF) were applied to remove azo dyes (tartrazine and amaranth) from aqueous solutions by adsorption. CF were prepared by casting technique and characterized. Response surface methodology was employed to optimize the adsorption process as a function of pH (2, 3 and 4) and CF concentration (100, 150 and 200 mg L-1). The possible interactions CF-dyes were investigated by Fourier transform infrared spectroscopy, dispersive energy X-ray spectroscopy, thermogravimetric analysis and color parameters. Adsorption-desorption cycles were also performed. The more appropriate conditions for the adsorption of both dyes were pH of 2 and CF concentration of 100 mg L-1. Under these conditions, the tartrazine and amaranth adsorption capacities were 413.8 and 278.3 mg g(-1), respectively. The interactions between the CF protonated amino groups and anionic form of the dyes at pH 2 were confirmed. Desorption experiments showed that the CF can keep its adsorption capacity maximum for two cycles. (C) 2013 Elsevier Inc. All rights reserved.
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