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

Alexandra Cemin, Fabrício Ferrarini, Matheus Poletto, Luis R. Bonetto, Jordana Bortoluz, Laurent Lemée, Régis Guégan, Valdemar I. Esteves, Marcelo Giovanela

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)375-389
Number of pages15
JournalInternational Journal of Biological Macromolecules
Volume170
DOIs
Publication statusPublished - 2021 Feb 15

Keywords

  • Adsorption
  • Eucalyptus grandis lignin
  • Methylene blue

ASJC Scopus subject areas

  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Economics and Econometrics
  • Energy(all)

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