交联壳聚糖乙酸酯冠醚对金属离子的吸附性能研究

本文合成了二苯并-16-冠-5-氯代乙酸酯冠醚和3,5-二叔丁基-二苯并-14-冠-4-双氯代乙酸酯冠醚,然后分别将之与交联壳聚糖(简称CCTS)反应,制备了交联壳聚糖二苯并-16-冠-5-乙酸酯冠醚(简称CCTS-1)和交联壳聚糖3,5-二叔丁基-二苯并-14-冠-4-双乙酸酯冠醚(简称CCTS-2),并研究了它们对Pb~(2+),Cu~(2+),Cr~(3+),Ni~(2+),Cd~(2+)的吸附性能。结果表明:这两种吸附剂对pb~(2+),Cu~(2+)有较高的吸附选择性。

STUDY ON THE ADSORPTION PROPERTIES FOR METAL IONS OF CROSSLINKED CHITOSAN ACETATE CROWN ETHERS

Two kinds of crosslinked chitosan acetate crown ethers, crosslinked chitosan diben-zo-16-c-5- acetate crown ether (CCTS-1) and crosslinked chitosan dibenzo-14-c-4-dia-cetate crown ether (CCTS-2) were synthesized by the reaction of crosslinked chitosan with dibenzo-16-c-5-chloroacetate crown ether and dibenzo-14-c-4-dichloroacetate crown ether. Their structures were confirmed by elemental analysis, IR spectra analysis and X-ray powder diffraction analysis. Adsorption and selectivity properties of CCTS-1 and CCTS-2 for Pb2+ ,Cu2+ ,Cr3+ ,Ni2+ ,Cd2+ were also investigated. The experimental results show that the two adsorbents have high selectivity for Pb2+ , Cu2+ in the coexistence of Ni2+ ; for aqueous system containing Pb2+ , Ni2+ or Cu2+ , Ni2+ , CCTS-1 only adsorbs Pb2+ or Cu2+ ; for aqueous system containing Pb2+, Cr3+ , Ni2+ , CCTS-2 has high adsorp-tion and selectivity properties for Pb2+.