X射线光电子光谱法研究壳聚糖吸附镉(Ⅱ)的机理  

Study of adsorption Mechanism of Chitosan for Cd^(2+) by X-ray Photoelectron Spectrometry

作　　者：王志华[1] 王书俊[1] 黄毓礼[1] 

机构地区：[1]北京化工大学可控化学反应科学与技术基础教育部重点实验室,北京100029

出　　处：《分析试验室》2001年第6期14-16,共3页Chinese Journal of Analysis Laboratory

摘　　要：用X射线光电子光谱法测定了壳聚糖和壳聚糖 Cd2 +络合物表面C、O及N原子的结合能及组成 ,研究了壳聚糖与镉离子的作用机理 ,氮原子的化学位移表明氨基是吸附活性基团 ,由化学分析和XPS得到参与吸附的N/Cd值为1 .6,存在物理吸附和化学吸附 。The compositions and bonding energies of elements C, O and N in the surfaces of chitosan and Cd 2+ chitosan complexes were determined by X ray photoelectron spectrometry. The interaction mechanism of chitosan and cadmium ion was investigated. The chemical shifts of the nitrogen atoms showed that the amine functions of glucosamine residues were the sites of interaction with the cadmium ions. The calculated value of the N/Cd ratio from XPS and chemical analysis was 1.6. Both physical adsorption and chemical adsorption occur between Cd 2+ and -NH 2 on the surfaces of chitosan. Two ligand atoms of N are attached to a metal ion of Cd 2+ in the chemisorption.

关 键 词：壳聚糖 吸附机理 X射线光电子光谱 镉(Ⅱ) 含镉废水 废水处理 

分 类 号：X703.1[环境科学与工程—环境工程] O647.3[理学—物理化学]