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Waste paper pulps containing cellulose, hemicellulose and lignin (23%) are cheap materials and more porous than virgin cellulose pulps. The adsorbents, the graft copolymers of 2-(dimethylamino) ethyl methacrylate (DM) grafting onto waste paper pulps (WPG)14), were synthesized by the method previously reported1)2). The color removal behavior of the anionic dyes (direct, acid, and reactive dyes) and sulfur dyes by the adsorbents was investigated, in comparison with the commercial adsorbents such as the active carbons and the polymer adsorbent.The order of the color removal was WPG>active carbon>polymer adsorbent>waste paper pulp. The color removal of the dyes by WPG of low degree of grafting (2-20%) reached about 100%, and it decreased for above 20% grafting. The ratio of the anion of the dye to the cation of DM in 15% grafting WPG was 1, and the ratio in the lower and the higher degrees of grafting WPG was 2-8 and 0.3-0.5, respectively. The order of the adsorption rate of the dyes by the WPG was direct>acid>reactive>sulfur dyes. The WPG showed Freundlich adsorption isotherms (m=k•c1/n), and the “k” value of the WPG was larger and the “1/n” value of the WPG was smaller as compared with those values of the active carbon. The adsorbed dye on the WPG was easily eluted with 0.2N-NaOH solution and 0.2N-HNO3 solution, and the regenerated WPG from which the dyes were eluted gave about 85-100% color removal even after 6times of the repeated adsorption test by the WPG.It was found that the WPG was a better adsorbent of dyes than active carbon with respect to the color removal of dyes and the repeated regeneration and the adsorption of dyes, and the color removal of dyes by WPG was due to the chemical and physical adsorptions.

COLOR REMOVAL OF DYES BY ADSORBENTS-GRAFT COPOLYMERS OF 2-(DIMETHYLAMINO) ETHYL METHACRYLATE GRAFTING ONTO WASTE PAPER PULP