Solubility and dye-binding properties of quaternized and peroxidase-polymerized kraft lignin

摘要

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 (H 4) and high pH (>pH Fraction was soluble over the pH 2 to 13 range. The pH 7-insoluble fraction was soluble at low (H 4) and high pH (>pH 12).