交换时间对离子交换法合成谷氨酸/锌铝层状双氢氧化物的结构和热稳定性的影响  

Influence of Exchange Time on Structure and Thermal Stability of Glutamic Acid/ZnAl Layered Double Hydroxides via Ion Exchange Method

作　　者：岑芳芳[1] 沙兆林[1] 陆天虹[1] 李淑萍[1] 

机构地区：[1]南京师范大学化学与环境科学学院,江苏省生物功能材料重点实验室,南京210097

出　　处：《应用化学》2010年第5期553-557,共5页Chinese Journal of Applied Chemistry

基　　金：江苏省自然科学基金(BK2007223)资助项目

摘　　要：采用离子交换法实现了谷氨酸(Glu)插层到ZnAl层状双氢氧化物(ZnAl-LDH)中而形成Glu/ZnAl-LDH纳米复合材料,并用X射线衍射(XRD)、傅里叶变换红外(FT-IR)光谱、透射电子显微镜(TEM)以及热失重-差热(TG-DTA)分析等测试技术,研究了交换时间对Glu/ZnAl-LDH纳米复合材料结构的影响。发现当交换时间为1d时,Glu/ZnAl-LDH纳米复合材料粒子的结晶度好,Glu分子均以垂直形式插入,此时Glu在层间达到交换平衡。当交换时间为2d时,部分Glu开始以水平方式插入ZnAl-LDH纳米材料层间。但当交换时间进一步延长时,ZnAl-LDH纳米材料的结构发生部分坍塌,而且ZnAl-LDH纳米材料在微酸性的Glu溶液中发生部分溶解而使其六边形的结构出现破损。由于Glu插入ZnAl-LDH纳米复合材料层间后,其稳定性得到提高,因此,ZnAl-LDH纳米材料可以作为优良的生物分子的载体和储存器。Glutamic acid（Glu） was intercalated into ZnAl layered double hydroxides（ZnAl-LDH） via the ion-exchange method to form Glu/ZnAl-LDH compounds,and the influence of exchange time on the structure of Glu/ZnAl-LDH was systematically investigated by X-ray diffraction（XRD）,Fourier transform infrared spectroscopy（FTIR）,transmission electron microscopy（TEM）,thermo-gravimetry（TG） and differential thermal analysis（DTA） techniques.It was found that when the exchange time was one day,the crystallinity of Glu/ZnAl-LDH compounds was high and Glu was intercalated vertically into the ZnAl-LDH sheets,and Glu in the layers reached exchange equilibrium at this moment.When the exchange time was 2 days,part of Glu was intercalated horizontally.When the exchange time was further extended,the strucutre of ZnAl-LDH would be partially collapsed.In addition,the hexagonal shape of ZnAl-LDH compounds would be dissolved partially in the acid solution.Furthermore,the thermal stability of Glu would be increased dramatically when Glu was intercalated into ZnAl-LDH compounds,hence,ZnAl-LDH could be used as the excellent carrier and storage of biomaterial.

关 键 词：ZnAl层状双氢氧化物 谷氨酸 离子交换法 

分 类 号：O611.6[理学—无机化学]