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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.
Nanosized gold sol was prepared by chemical reduction of chloroauric acid with sodium borohydride in alkaline solution and the interaction between gold and chitosan was studied by UV-Vis absorption spectroscopy. The results showed that chitosan could capture gold nanoparticle and form easily Gold @ chitosan composites were synthesized and characterized by X-ray powder diffraction (XRD), UV-vis DRS, transmission electron microscopy (TEM), infrared spectroscopy (IR), differential thermal gravimetric and differential thermal analysis (DTG-DTA) and other such composite material was characterized and found that the material has smaller gold nanoparticles, the presence of chitosan changes the gold nanoparticles of the plasma resonance absorption, there is a certain bond between the two With molecular oxygen as oxidant, under mild conditions, the material has good catalytic performance for the selective oxidation of glucose to gluconic acid.