Abstract
The weak base type anion exchange adsorbent was prepared by introducing the amino group to the cotton yarn. The adsorbent was for the water recycle model system in order to remove reactive dyes in the rinsing water. The chemical treatments were carried out in aqueous solutions for introducing the ion exchange group into the inside of the fiber matrix. Cotton yarns were graft-copolymerized with 5% acrylamide using cerium salt as an initiator at 50°C. The maximum grafting ratio was 23.3%. The grafted amide group was transformed into the amino group through Hofmann-degradation using sodium-hypochloride. The nitrogen content of the sample was 1.5%. The breaking strength of the ion exchangeable cotton yarn decreased to 75% of the original cotton yarn through the above chemical treatments. The colour removal from rinsing waste water used in the model system was examined with the treated yarn. It was found that the capacity of this yarn for adsorbing hydrolyzed reactive dyes increased in acidic solution and at a high temperature. The colour removal of this yarn was the same as that of activated carbon powder according to the results of the batch method. In contrast, the colour removal with this yarn was ten times higher than that with activated carbon granules in the column method.
