SYNOPSISAminoalkyl celluloses ( AmACs) were prepared from 6-chlorodeoxycellulose and aliphatic diamines HzN ( CHz),NHz ( m = 2, 4, 6, 8). Their adsorption and desorption of divalent heavy metal ions such as Cu2+, Mn2+, Co2+, Ni2+ and their mixtures were also investigated in detail.Adsorption of metal ions on AmACs was remarkably affected by the pH of the solution, the metal ion and its initial concentration, and also the number of methylene units in the diamines. No adsorption of metal ions occurred on AmACs in strongly acidic solutions. However, metal ions were adsorbed rapidly on AmACs from weakly acidic solutions and the amount of adsorption increased with increasing pH. The effectiveness of AmACs as adsorbents decreased with increasing length of the methylene moiety, and AmAC from ethylenediamine ( m = 2 ) was most effective. The adsorption of metal ions on AmACs was in the order Cu2+ > Ni2+ > Co2+ > Mn2+. Accordingly, their behavior followed the Irving-Williams series and Cu2+ ions were preferentially adsorbed from solutions containing metal ion mixtures. The adsorbed ions were easily desorbed from the AmACs by stirring in 0.1 M HC1.

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Inc. was used for pH adjustment. 6.20 g of SHS was added to 45 ml of ion-exchanged water and stirred at 343 K for 2 h. The resulting SHS solution, which was adjusted to pH 12 using the ammonia solution, was mixed with 10 ml of 2 M aqueous ZnSO 4 solution