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6382694 
Journal Article 
Solubility and dye-binding properties of quaternized and peroxidase-polymerized kraft lignin 
Laszlo, JA 
1999 
Yes 
Environmental Technology
ISSN: 0959-3330
EISSN: 1479-487X 
20 
6 
607-615 
10113/20656 
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-trimethylamoni 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 12). Treatment of the pH 7-soluble quaternized lignin fraction with soybean peroxidase and hydrogen peroxide under nitrogen produced a soluble, high molecular weight polymer, as determined by ultrafiltration analysis. Peroxidase treatment of the pH 7-insoluble fraction at pH 3 produced a material not completely soluble at any pH, probably by modifying the lignin structure but not necessarily by increasing its molecular weight. All quaternized lignin fractions were demonstrated to bind Orange 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. 
; solubility; dyes; binding properties; peroxidase; lignin; kraft pulp; cations; wastewater treatment; decolorization; pH; soybeans; hydrogen peroxide; polymers; textile mill effluents; K540; W000/