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United States Department of Agriculture

Agricultural Research Service

Title: Aqueous Solubility and Molecular Weight Distribution of Quaternized and Peroxidase-Polymerized Kraft Lignin

item Laszlo, Joseph

Submitted to: American Chemical Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: March 25, 1999
Publication Date: N/A

Technical Abstract: The ability of cationic kraft lignin to function as a flocculant for decolorization of textile wastewaters was examined. Kraft lignin was quaternized with high efficiency in alkaline solution with 3-chloro-2-hydroxypropyl-trimethylamonium chloride. The product formed was separated into two fractions arbitrarily based on their aqueous solubility at pH 7. The pH 7-soluble fraction was soluble over the pH 2 to 13 range. The pH 7-insoluble fraction was soluble at low (< pH 4) and high pH (> pH 12). Treatment of the fraction with soybean peroxidase and hydrogen peroxide produced a soluble, high molecular weight polymer. All quaternized lignin fractions were demonstrated to bind Orange II and hydrolyzed Reactive Red 180, but only peroxidase-polymerized lignin produced rapidly settling flocs. Peroxidase-treated, quaternized kraft lignin can be used in place of synthetic cationic polymers for decolorization of textile wastewaters.

Last Modified: 4/22/2015
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