半胱氨酸、硫代乙醇酸接枝交联壳聚糖对贵、重金属的络合吸附性能  

Adsorption and complexation properties of sulfhydryl cross-linked chitosan grafted by cysteine and thioglycollic acid for precious or heavy metal Ions

作　　者：张伟安 汪玉庭[2] 杨智宽[2] 谢云慧[2] 吴绪伟[2] 

机构地区：[1]江西省环境保护厅环境工程评估中心,江西南昌330077 [2]武汉大学资源与环境科学学院环境科学系,湖北武汉430079

出　　处：《南昌大学学报（理科版）》2012年第5期472-477,共6页Journal of Nanchang University(Natural Science)

基　　金：国家自然科学基金资助项目(20377033)

摘　　要：用2种巯基化试剂半胱氨酸(Cys)和硫代乙醇酸(Thi)与环氧氯丙烷交联的壳聚糖(CCTS)反应,制得2种接枝了巯基的交联壳聚糖Cys-CCTS和Thi-CCTS,用红外光谱和X射线粉末衍射表征了它们的结构;比较了这2种巯基壳聚糖和交联壳聚糖对不同贵、重金属的吸附性能,结果表明Thi-CCTS对Ag+,Cys-CCTS对Cu2+比CCTS有更好的吸附效果;通过分析吸附剂吸附金属离子前后的红外图谱变化,可以看出Cys-CCTS和Thi-CCTS中的巯基与重金属之间发生了很强的络合作用,因此认为巯基交联壳聚糖与金属之间既有物理吸附,同时也有鳌合作用;而CCTS与金属间的红外光谱图没有发生明显的变化,因此推断其作用为物理吸附。Two kinds of sulfhydryl cross-linked chitosan Cys-CCTS and Thi-CCTS were prepared by reactions from two types of sulfhydryl reagents cysteine and thioglycollic acid with chitosan cross-linked by epichlorohydrin（CCTS）.The structures of CCTS,Cys-CCTS and Thi-CCTS were characterized by infrared spectrum and X-ray diffraction analysis.The adsorption capacities of Cys-CCTS and Thi-CCTS for several precious metal ion or heavy metal ion were also investigated.The experimental results showed that Thi-CCTS and Cys-CCTS presented comparable or even better adsorption effects in compared to CCTS for Ag＋ and for Cu2＋ respectively.The changes in infrared spectrum of sorbents after their absorption of metal ion were analyzed,intense complexation appeared between Cys-CCTS＇s and Thi-CCTS＇s sulfhydryls,as well as metal ion in the course of adsorption.These suggested that there were physisorptions and chelations between sulfhydryl crosslinked chitosan and metal;however,only physisorptions no chelation presented between CCTS and metal.The changes on infrared spectrum of CCTS and metal was unconspicuous.

关 键 词：环境工程学 巯基交联壳聚糖 红外光谱分析 重金属 络合 

分 类 号：O647[理学—物理化学]