Application of cupuassu shell as biosorbent for the removal of textile dyes from aqueous solution

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:92

Article

Cardoso, Natali F.¹  Lima, Eder C.¹  Pinto, Isis S.¹  Amavisca, Camila V.¹  Royer, Betina¹  Pinto, Rodrigo B.¹  Alencar, Wagner S.²  Pereira, Simone F. P.² 

[1] Univ Fed Rio Grande do Sul, Inst Chem, BR-91501970 Porto Alegre, RS, Brazil

[2] Fed Univ Para, Inst Exact & Nat Sci, BR-66059 Belem, Para, Brazil

关键词: Biosorption;    Cupuassu shell;    Textile dyes;    Nonlinear isotherm fitting;    Adsorption kinetics;   

DOI  :  10.1016/j.jenvman.2010.12.010

来源: Elsevier

【 摘 要 】

The cupuassu shell (Theobroma grandiflorum) which is a food residue was used in its natural form as biosorbent for the removal of C.I. Reactive Red 194 and C.I. Direct Blue 53 dyes from aqueous solutions. This biosorbent was characterized by infrared spectroscopy, scanning electron microscopy, and nitrogen adsorption/desorption curves. The effects of pH, biosorbent dosage and shaking time on biosorption capacities were studied. In acidic pH region (pH 2.0) the biosorption of the dyes were favorable. The contact time required to obtain the equilibrium was 8 and 18 h at 298 K, for Reactive Red 194 and Direct Blue 53, respectively. The Avrami fractionary-order kinetic model provided the best fit to experimental data compared with pseudo-first-order, pseudo-second-order and chemisorption kinetic adsorption models. The equilibrium data were fitted to Langmuir, Freundlich, Sips and Radke-Prausnitz isotherm models. For both dyes the equilibrium data were best fitted to the Sips isotherm model. (C) 2010 Elsevier Ltd. All rights reserved.

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