Potentiality of lignin from the Kraft pulping process for removal of trace nickel from wastewater: Effect of demineralisation

M. Betancur, P. R. Bonelli, J. A. Velásquez, A. L. Cukierman

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    An industrial raw Kraft lignin was investigated to ascertain its potential use for removal of trace Ni(II) ion from wastewater by using dilute solutions (0.34-1.7 mM) as models. The effect of demineralisation on its metal sorption ability was examined by employing acid pre-treated samples. Under fixed pre-established equilibrium conditions, the raw lignin exhibited a lower effectiveness than the demineralised one, with the latter attaining an almost complete removal of Ni(II) ions. For both lignins, sorption kinetics was properly described by a pseudo-second order rate model. Equilibrium isotherms were also determined and adequately represented by conventional two-parameter models. The higher nickel sorption capacity for the demineralised lignin compared to the raw sample was consistent with enhancements in the negative magnitude of zeta potential, sodium sorption capacity, and content of phenolic hydroxyl groups occasioned by the acid pre-treatment. Accordingly, demineralisation appears as a readily convenient strategy to improve the behaviour of industrial Kraft lignin for potential use as a biosorbent of trace nickel from polluted water.

    Original languageEnglish
    Pages (from-to)1130-1137
    Number of pages8
    JournalBioresource Technology
    Issue number3
    StatePublished - Feb 2009

    Bibliographical note

    Funding Information:
    Financial support from Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad de Buenos Aires (UBA), Agencia Nacional de Promoción Científica y Tecnológica (ANPCYT-FONCYT) from Argentina, and from the European Commission - Alfa Programme (Project ALFA II 0412 FA FI), is gratefully acknowledged. M. Betancur acknowledges the mobility grant of the EU-Alfa Programme to carry out research activities at the University of Buenos Aires, Argentina. Thanks are also extended to CAS Instrumental (Argentina) for zeta potential measurements.


    • Biosorption
    • Demineralised lignin
    • Kraft lignin
    • Metal pollution
    • Wastewater


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