Journal
CHEMICAL ENGINEERING JOURNAL
Volume 168, Issue 2, Pages 620-628Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2011.01.040
Keywords
Adsorption; Lignin; Brilliant Red 2BE dye; Nonlinear isotherm fitting; Adsorption kinetics
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Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Fundacao de Amparo a Pesquisa do Estado do Rio Grande do Sul (FAPERGS)
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG)
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A lignin resulting from acid hydrolysis of sugarcane bagasse in the process of bioethanol production from biomass (M(w) = 1890g mol(-1)) was purified and carboxy-methylated to obtain a macromolecule (CML), soluble in water at pH >= 4.5, with a degree of substitution (DS) of 0.46 +/- 0.01 relative to C(9) - the basic unit of lignins. This modified lignin was complexed with the Fe(3+) ion (CML-Fe) and used as an adsorbent for the successful removal of Brilliant Red 2BE textile dye from aqueous solutions. The adsorbent was characterised by infrared spectroscopy and scanning differential calorimetry. The effects of pH, adsorbent dosage and shaking time on adsorption capacity were studied. In pH 2.0 the adsorption of the dye was maximum. The contact time to obtain equilibrium at 298 K was fixed at 12 h for the CML-Fe adsorbent. The Avrami fractional-order kinetic model provided the best fit to the experimental data compared with pseudo-first-order or pseudo-second-order kinetic adsorption models. For Brilliant Red 2BE dye, the equilibrium data were best fitted to the Sips isotherm model. (C) 2011 Elsevier B.V. All rights reserved.
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