新型含氮、硫纤维素螯合树脂的合成及其吸附性能

将稻壳纤维素的氯化产物(CDC)分别与水合肼、乙二胺、二乙烯三胺、三乙烯四胺、丁二胺和己二胺反应,合成了6种含氮纤维素螯合树脂(ADC-1～ADC-6);在碱性条件下用环硫氯丙烷交联ADC合成了6种新型含氮、硫纤维素螯合树脂(TADC-1～TADC-6),研究了合成条件和ADC,TADC树脂对金属离子的吸附性能.结果表明,ADC树脂对Cu²⁺,Cr³⁺,Ni²⁺,Hg²⁺,Zn²⁺等离子有较好的吸附性,对Hg²⁺吸附容量可达0.5mmol/g左右;TADC树脂对Ag⁺,Cu²⁺,Hg²⁺等离子有较好的吸附性,对Hg²⁺和Ag⁺吸附容量可达1.1mmol/g和1.9mmol/g左右;强酸性条件下,ADC和TADC树脂的吸附容量都降低,它们对金属离子的吸附顺序分别为Hg²⁺>Cu²⁺>Ni²⁺和Ag⁺>Hg²⁺>Cu²⁺,树脂用10%的氨水解吸附可重复使用.

Synthesis and Adsorption Properties of New Type Chelating Cellulose Resins Containing Sulfur and Nitrogen

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.