金@壳聚糖复合材料的合成、表征及其葡萄糖选择氧化性能  

Synthesis,Characterization and Their Catalytic Performance of Au@Chitosan Composite Materials for Selective Oxidation of Glucose

作　　者：刘克增[1] 石玲玲[1] 金明善[1] 索掌怀[1] 

机构地区：[1]烟台大学应用催化研究所,山东烟台264005

出　　处：《分子催化》2009年第5期436-441,共6页Journal of Molecular Catalysis(China)

基　　金：国家自然科学基金(20473070);山东省自然科学基金(Y2004B07)资助

摘　　要：采用硼氢化钠化学还原氯金酸的碱性溶液制备了纳米金溶胶,利用紫外-可见吸收光谱研究了金与壳聚糖的相互作用.结果表明,壳聚糖能够捕获金纳米粒子并易于形成金@壳聚糖复合材料.利用X-光粉末衍射(XRD)、紫外-可见漫反射光谱(UV-vis DRS)、透射电镜(TEM)、红外光谱(IR)、微分热重及差热分析(DTG-DTA)等对这种复合材料进行了表征,发现该材料具有较小的金纳米粒子,壳聚糖的存在改变了金纳米粒子的等离子共振吸收,二者之间存在一定的键合作用.以分子氧为氧化剂,在温和条件下,该材料对葡萄糖选择氧化制葡萄糖酸反应具有良好的催化性能.Colloidal gold nanoparticles were prepared by chemical reduction of a basic HAuCl4 solution with NaBH4 solution at the presence of chitosan. The interaction between chitosan and gold nanop ticles was studied by UV-vis absorption spectrum. Au@ chitosan composition materials obtained were characterized by X-ray diffraction, transmission electron spectroscopy, UV-vis diffuse reflection spectrum, infrared spectroscopy, differential thermo- gravimetry, and differential thermal analysis techniques. The results indicated that chitosan can capture gold nanoparticles and the average size of formed gold nanoparticles is about 25 nm. The presence of chitosan changes the plasma absorption of gold nanoparticles. There exists an interaction between gold nanoparticles and chitosan molecules. The composition material is found to have good catalytic performance for selective oxidation of glucose to gluconic acid using molecular oxygen as oxidant under mild conditions.

关 键 词：壳聚糖 纳米金粒子 复合材料 葡萄糖 选择氧化 

分 类 号：O643.32[理学—物理化学]