Evaluation of heavy metal removal by oxidised lignins in acid media from various sources

Germán C. Quintana, George J.M. Rocha, Adilson R. Gonçalves, Jorge A. Velásquez

    Research output: Contribution to journalArticleResearchpeer-review

    32 Scopus citations

    Abstract

    The capacity for removal of heavy metals from liquid streams by formation of complexes with lignins oxidized by acid treatment was studied. Lignins were obtained from different sources: sulfuric acid pre-treated cane bagasse, soda pulping bagasse, eucalypt Kraft lignin, and commercial Kraft lignin. These lignins were characterized using different techniques to determine Klason lignin, carbohydrates, total acids, ashes, and their main functional groups: phenolic-OH, carbonyls, etc. The studied lignins were determined spectroscopically using FTIR. In order to increase the metal adsorption capacity, lignins were oxidized at 100°C during 2 h, using aqueous solutions of H2O2 in distilled water solvent and HCl catalyst. Some lignin adsorption isotherms were constructed before and after the oxidation process to define Cd(II) ion removal capacity.

    Original languageEnglish
    Pages (from-to)1092-1102
    Number of pages11
    JournalBioResources
    Volume3
    Issue number4
    StatePublished - Nov 2008

    Keywords

    • Adsorption Isotherms
    • Bagasse lignin
    • Kraft lignin
    • Lignin characterization
    • Lignin oxidation

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