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6382778 
Journal Article 
Solubility and dye-binding properties of quarternized and peroxidase- polymerized Kraft lignin 
Laszlo, J 
1999 
Yes 
Environmental Technology
ISSN: 0959-3330
EISSN: 1479-487X 
6 
607-615 
The ability of cationic (quarternized) Kraft lignin to act as a flocculant for the decolorization of textile wastewater was studied. Kraft lignin was quarternized with 3-chloro-2-hydroxypropyl-trimethylammonium chloride in an alkaline solution with an apparently high efficiency (90 per cent). The quarternized lignin was separated into 2 fractions based on solubility of pH 7. The soluble fraction comprised a lower molecular weight material than the insoluble fraction. The pH 7-soluble fraction was treated with soyabean peroxidase and hydrogen peroxide. This produced a soluble high-molecular weight polymer. Peroxidase treatment of the pH 7-insoluble fraction at pH 3 resulted in the formation of a material that was not soluble at any pH. All fractions bound Orange II and hydrolysed Reactive Red 180. Peroxidase- polymerized lignin produced flocs. 
; Solubility; Polymerization; Coagulants; Decolorization; Reactivity; Pulp and paper industry (Pulp); Treatment; Hydrolysis; Hydrogen ion concentrations; Polymers (see also Polyelectrolytes); Binding (see also Cementation); Colour; Enzymes (Oxidoreductase) (Peroxidase); Efficiency; Floc; Hydrogen peroxide; Textile industry waste waters; Molecular weight; Lignin compounds; Soya beans; Cationic; Separation (see also Individual processes)/