Abstract: Rice husk cellulose was treated by thionyl chloride to give 6 chlorodeoxycellulose(6 CDC), which was treated with anhydrous hydrazine, ethylenediamine, diethylenetriamine, triethylenetetramine, 1,4 diaminobutane and hexamethylenediamine respectively in DMSO at 100 ℃ giving six chelating resins(ADC-1-ADC-6). The cross linking of ADC with chloromethylthiiane in the presence of alkaline gave six new chelating resins(TADC-1TADC-6) which contain sulfur and nitrogen. The conditions of synthesis for CDC, ADC and TADC were studied. The adsorption properties of ADC-resins and TADC resins for metal ions were thoroughly studied. It was found that ADC resins possessed high capacities for Hg ²⁺ (about 0.5 mmol/g) and TADC resins did for Hg ²⁺ (1.1 mmol/g) and Ag⁺(1.9 mmol/g). The effect of pH value on adsorption capacities of ADC resins was more remarkable than on TADC resins. The adsorption capacities of ADC resins and TADC resins were in the order Hg ²⁺ >Cu ²⁺ >Ni ²⁺ and Ag⁺>Hg ²⁺ >Cu ²⁺ and they can be reused by desorption of 15% ammonia hydroxide.

Key words: Rice husk cellulose, Chelating resins, Chloromethylthiiane, Adsorption, Metal ions