Statistical optimization, interaction analysis and desorption studies for the azo dyes adsorption onto chitosan films

被引：83

作者：

Rego, T. V. ^{[1
]}

Cadaval, T. R. S., Jr. ^{[1
]}

Dotto, G. L. ^{[1
]}

Pinto, L. A. A. ^{[1
]}

机构：

[1] Fed Univ Rio Grande, Sch Chem & Food, Unit Operat Lab, BR-96203900 Rio Grande, RS, Brazil

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2013年 / 411卷

关键词：

Adsorption; Amaranth; Chitosan films; Desorption; Tartrazine; LOW-COST ADSORBENTS; AQUEOUS-SOLUTIONS; METAL-IONS; FOOD DYES; REMOVAL; RED; BIOSORPTION; DECOLORIZATION; ISOTHERMS; KINETICS;

D O I：

10.1016/j.jcis.2013.08.051

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：27 / 33

页数：7

共 35 条

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