Characterization and use of a lignin sample extracted from Eucalyptus grandis sawdust for the removal of methylene blue dye

A lignin sample was extracted from Eucalyptus grandis sawdust, by the Klason method, and used as adsorbent for the removal of methylene blue (MB) from aqueous solutions. By using a set of complementary analytical tools, the lignin appeared to be constituted of oxygenated functional groups and aromat...

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Bibliographic Details
Published in:	International journal of biological macromolecules Vol. 170; pp. 375 - 389
Main Authors:	Cemin, Alexandra, Ferrarini, Fabrício, Poletto, Matheus, Bonetto, Luis R., Bortoluz, Jordana, Lemée, Laurent, Guégan, Régis, Esteves, Valdemar I., Giovanela, Marcelo
Format:	Journal Article
Language:	English
Published:	Netherlands Elsevier B.V 15-02-2021 Elsevier
Subjects:	Adsorption Coloring Agents - chemistry Continental interfaces, environment Eucalyptus - chemistry Eucalyptus grandis lignin Hydrogen-Ion Concentration Kinetics Lignin - chemistry Lignin - isolation & purification Methylene blue Methylene Blue - chemistry Plant Extracts - chemistry Sciences of the Universe Water Water Pollutants, Chemical - chemistry Water Purification - methods Wood Adsorption Eucalyptus grandis lignin Methylene blue
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Summary:	A lignin sample was extracted from Eucalyptus grandis sawdust, by the Klason method, and used as adsorbent for the removal of methylene blue (MB) from aqueous solutions. By using a set of complementary analytical tools, the lignin appeared to be constituted of oxygenated functional groups and aromatic moieties, while showing a specific surface area of 20 m2 g−1 and polydisperse particles. Different experimental conditions with various solid to liquid ratio, pH, as well as other external experimental parameters were investigated for the removal of MB by the lignin sample. The experimental adsorption data at the equilibrium were properly fitted by Langmuir model, while adsorption kinetical isotherms were correctly adjusted by the pseudo-second order model. The MB removal by lignin was spontaneous involving physisorption mechanisms leading to a saturation of the adsorption sites with a maximum adsorbed amount of about 32 mg g−1. The data acquired in this study also emphasized the interests to use lignin as potential adsorbent in the light of its properties for the removal of cationic dyes, including MB, with possible recycling and reuse cycles of lignin without any significant loss of its properties. [Display omitted]
ISSN:	0141-8130 1879-0003
DOI:	10.1016/j.ijbiomac.2020.12.155