Preparation of lignin from waste black liquors as ion exchangers

Soda and peroxyacid lignins are precipitated from produced black liquor from cotton stalks pulping with soda and peroxyacid pulping process. These precipitated peroxyacid lignins are hydrolyzed using 10% HCl. Different functional groups are incorporated into lignin by carboxylation and phosphorylation reactions. Also, cross linking of these lignins was carried out by using epichlorohydrine. Infrared spectroscopy of these lignins and their derivatives were studied. On the other hand, the efficiency of sorption of metal ions by this modified lignin was investigated. It has been seen that, the peroxyacid lignin has higher efficiency toward metal ions uptake than the soda lignin. Thermal analysis of these lignins was also studied using TGA and DTA techniques.

Author(s): Amal. H. Abdel-kader

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