Mechanism of detoxification of aluminum ions by kraft lignin treated with alkaline oxygen

Kraft lignins modified by radical sulfonation or alkaline oxygen treatment were rich in acidic groups, such as sulfonic acid, carboxylic acid, and phenolic hydroxyl groups, and were effective as soil-conditioning agents, especially because of their ability to trap aluminum ions eluted from soil unde...

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Bibliographic Details
Published in:Journal of wood science 2003-02, Vol.49 (1), p.93-99
Main Authors: Saito Katsumata, K. (Tokyo National Univ. of Fine Arts and Music (Japan)), Shintani, H, Meshitsuka, G
Format: Article
Language:English
Subjects:
ALUMINIUM
Aluminum
Biological and medical sciences
Biotechnology
BYPRODUCTS
Calcium ions
Cation exchanging
Complex formation
COMPLEXING
Copper
Ferric ions
Fundamental and applied biological sciences. Psychology
Hydroxyl groups
Industrial applications and implications. Economical aspects
Lignin
LIGNINS
NMR
NMR SPECTROSCOPY
Nuclear magnetic resonance
Other applications
Oxygen
POTENTIOMETRY
SOIL CONDITIONERS
Soil conditions
Sulfonic acid
Titration
WASTE UTILIZATION
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Summary:Kraft lignins modified by radical sulfonation or alkaline oxygen treatment were rich in acidic groups, such as sulfonic acid, carboxylic acid, and phenolic hydroxyl groups, and were effective as soil-conditioning agents, especially because of their ability to trap aluminum ions eluted from soil under acidic conditions. Formation of complexes between aluminum ions and modified lignins was examined using potentiometric titration and 27Al nuclear magnetic resonance (NMR) spectroscopy. Changes in the titration curve of a modified lignin by the addition of aluminum ions suggest the release of protons after the formation of complexes between them. Disappearance of 27Al-NMR signals assigned to various aluminum ions by the addition of kraft lignin treated with alkaline oxygen was also attributed to the formation of complexes. The relative ease of proton release because of complex formation between a modified lignin and metal ions was as follows: Fe3+ > Al3+ > Cu2+ > Pb2+ > Mn2+ > Ca2+. This indicates that aluminum complexes are quite stable, and the aluminum ion is not exchanged with cations other than Fe3+.
ISSN:1435-0211
1611-4663
DOI:10.1007/s100860300015