Journal
BIORESOURCE TECHNOLOGY
Volume 100, Issue 3, Pages 1130-1137Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2008.08.023
Keywords
Kraft lignin; Demineralised lignin; Wastewater; Metal pollution; Biosorption
Funding
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- Universidad de Buenos Aires (UBA)
- Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCYT-FONCYT)
- European Commission [ALFA II 0412 FA FI]
- EU-Alfa Programme
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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. (c) 2008 Elsevier Ltd. All rights reserved.
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