二异氰酸酯与壳聚糖交联产物对金属离子的吸附性能

PREPARTION OF CROSSLINKED CHITOSAN TDI AND ITS ADSORPTION PROPERTIES

研究了二异氰酸酯与壳聚糖的交联反应，其产物与壳聚糖相比，酸溶解度由８２．０４％降到５８．０８％。ＤＳＣ曲线表明，交联产物的热稳定性明显提高，对低价重金属离子（Ｈｇ２＋，Ｃｄ２＋，Ｃｕ２＋）有选择性吸附，并在吸附量上有所提高。

The preparation and adsorption to Hg^2+, Cd^2+,Cu^2+, Cr^6+, Pb^2+, Zn^2+, Ni^2+ of chitosanmodified by TDI are studied, The effects of pH, time and temperature on the adsorption are investigated. The results show that the modified chitosan is easy to be regenerated and less soluble in asidic solution and it has higher adsorption selectivity for Hg^2+, Cd^2+, Cu^2+ when Hg^2+, Cd^2+, Cu^2+, Cr^6+, Ph^2+,Zn^2+,Ni^2+ are present simultaneously in solution.