壳聚糖衍生物与Ca(Ⅱ)螯合反应的动力学及机理研究  

Studies on kinetics and mechanism of chelating reaction chitosan derivatives with Ca(Ⅱ) ions

作　　者：丁萍[1] 黄可龙[2] 刘艳飞[2] 李桂银[2] 

机构地区：[1]中南大学公共卫生学院,湖南长沙410078 [2]中南大学化学化工学院,湖南长沙410078

出　　处：《功能材料》2008年第6期961-964,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(20376085)

摘　　要：利用吸附体系研究了Ca(Ⅱ)与壳聚糖衍生物的吸附动力学行为,动力学模式函数为1/c=kt,螯合反应的速率方程为:dcdt=-kc2用13CNMR和广角X射线衍射(WXRD)分析等对壳聚糖衍生物进行了结构表征,通过红外光谱(IR)和X射线光电子能谱(XPS)研究了壳聚糖衍生物与Ca(Ⅱ)的配位机理。结果表明:配合物中Ca(Ⅱ)与α-酮戊二酸缩壳聚糖(KCTS)中氨基氮原子配位,与羟胺α-酮戊二酸缩壳聚糖(HKCTS)配位的配位原子为—NH—中的氮原子、羟肟酸中的氧原子及羰基中的氧原子。A adsorption system was applied to study the adsorption of Ca（ Ⅱ ） ion onto chitosan derivatives, The adsorption isotherms were correlated by dc/dt= - kc^n. By means of linear correlation, the shapes of the isotherm curves were similar to the kinetic function of 1/c=kt and the rate equation was dc/dt=-kc^2 , indicating that the chemical sorption was the rate-limiting step. ^13 CNMR and WXRD characterized the chemical structures of chitosan α-ketoglutaric acid （KCTS） and hydroxamated chitosan α-ketoglutaric acid （HKCTS）. The adsorption mechanism of chitosan derivatives with Ca（ Ⅱ ） was studied by IR and XPS. The results indicated that the nitrogen in -NH- of KCTS were coordination atoms. N atom of amino group, O atom of hydroxamic acid and O atom of carbonyl group in HKCTS coordinated with Ca（ Ⅱ ）.

关 键 词：壳聚糖衍生物 吸附 螯合反应 钙离子 

分 类 号：R318.08[医药卫生—生物医学工程]