Study on the Flocculation and Decolorization Performances of the Modified Lignin
The lignin from black liquor was modified through Mannich reaction to prepare a kind of cationic lignin amine.The efficiency of amination of the lignin was determined by the nitrogen content.The orthogonal experiment was employed to study the influence of the temperature,formaldehyde and amine dosage on the modified degree of the lignin,and to get the optimum technological conditions.The effect of ultrasound on aminating modification of lignin was researched too.The structures of lignin and lignin amine were studied through FT-IR and SEM.The test of adsorption decolourization performance of the modified lignin samples was carried out,and the effect of decolourization time and the dosage of the modified lignin on decolorization of magenta were investigated.The results showed that the major.parameters of modification were temperature and the amount of formaldehyde.Modified lignin amine samples showed strong flocculation decolorization performance for fuchsin solution,the decolorization rate reached 93％ when the reaction time was 100 min,the modified lignin amount was 10 mg (0.5 g/L).
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