交联壳聚糖的结构及其对不同金属离子的吸附性能  

Structure and Adsorption Property of Crosslinked Chitosan Towards Metal Ions

作　　者：石光[1] 袁彦超[1] 陈炳稔[1] 王瑞香[1] 

机构地区：[1]华南师范大学化学系,广州510631

出　　处：《应用化学》2005年第2期195-199,共5页Chinese Journal of Applied Chemistry

摘　　要：以甲醛、环氧氯丙烷为交联剂,由壳聚糖(CTS)合成了一种交联壳聚糖微球(AECTS)。研究了 AECTS对Cu2+、Ni2+、Co2+的静态吸附性能,测定了吸附等温线,并通过FTIR、WAXD、DTG以及DSC等方法 对吸附产物的结构进行了表征。结果表明,AECTS对Cu2+、Ni2+、Co2+的吸附量分别为2.42、1.37和 0.39mmol;IR分析表明,金属离子的吸附主要是与壳聚糖分子中的氨基、羟基配位所致,且配位强度正比于 吸附量;WAXD分析显示,金属离子的吸附不仅发生在非晶区,也渗透到晶区,对晶区的破坏程度正比于吸附 量。TG分析表明,交联、金属吸附使CTS3个降解阶段的温度不同程度地向低温移动,移动幅度与金属吸附 量存在一定的对应关系。The adsorption of Cu 2+, Ni 2+ and Co 2+ onto chitosan crosslinked by formaldchyde and epichlorohydrin (AECTS) has been studied. The adsorption capacities of AECTS towards Cu 2+, Ni 2+ and Co 2+ were found to be 2.42, 1.37 and 0.39 mmol/g, respectively. The FTIR analysis indicates that the adsorption was realized via the coordination of —NH_2 and —OH groups in AECTS to the metal ions, and the binding strength was positively proportional to the adsorption capacity. WAXD results indicate metal ions adsorbed onto both the amorphous and crystal regions of AECTS, and the destructive degree of the crystal region was in direct proportion to the adsorption capacity. TG analysis shows that the crosslinking and metal ions adsorption could change the three decomposition temperatures of CTS to lower degree, depending on adsorption capacity change.

关 键 词：交联壳聚糖 CU^2+ CO^2+ NI^2+ 结构 吸附性能 

分 类 号：O636[理学—高分子化学]