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Advisor(s)
Abstract(s)
The main objective of this work was to assess Eucalyptus globulus lignin as an adsorbent
and compare the results with kraft lignin, which has previously been demonstrated to be an effective
adsorbent. Eucalypt lignin was extracted (by the dioxane technique), characterised, and its adsorption
properties for Cr(VI) ions were evaluated. The monomeric composition of both types of lignin
indicated a high content of guaiacyl (G) and syringyl (S) units but low content of p-hydroxyphenyl
(H), with an H:G:S ratio of 1:50:146 (eucalypt lignin) and 1:16:26 (kraft lignin), as determined by
Py-GC/MS. According to elemental analysis, sulphur (2%) and sodium (1%) were found in kraft
lignin, but not in eucalypt lignin. The adsorption capacity of the eucalypt lignin was notably higher
than the kraft lignin during the first 8 h, but practically all the ions had been absorbed by both the
eucalypt and kraft lignin after 24 h (93.4% and 95%, respectively). Cr(VI) adsorption onto both lignins
fitted well using the Langmuir adsorption isotherm model, with capacities of 256.4 and 303.0 mg/g,
respectively, for eucalypt and kraft. The study’s overall results demonstrate the great potential of
eucalypt lignin as a biosorbent for Cr(VI) removal from aqueous solutions
Description
Keywords
Eucalyptus kraft lignin chromium analytical pyrolysis biorefinery
Pedagogical Context
Citation
Lourenço, A.; Kuki´c, D.; Vasi´c, V.; Costa, R.A.; Antov, M.; Š´ciban, M.; Gominho, J. Valorisation of Lignocellulosic Wastes, the Case Study of Eucalypt Stumps Lignin as Bioadsorbent for the Removal of Cr(VI). Molecules 2022, 27, 6246
Publisher
MDPI