PVP 稳定的纳米 Au 溶胶对葡萄糖液相选择氧化的催化性能

 采用化学还原法制备了聚乙烯吡咯烷酮 (PVP) 稳定的纳米 Au 溶胶, 这种 Au 溶胶在葡萄糖空气氧化制葡萄糖酸反应中具有良好的催化性能. 考察了 PVP 加入量和氯金酸前驱液的浓度对反应活性的影响. 紫外-可见吸收光谱和透射电镜分析结果表明, 含有较小 Au 粒子的 Au 溶胶体系具有较高的催化活性. 当 PVP/Au 质量比为 40, 氯金酸浓度为100 μg/ml 时, 得到稳定的 Au 溶胶体系具有金粒子尺寸小、分布均匀的特点, 对葡萄糖氧化反应活性高, 葡萄糖的转化率达到 54.4%.

Selective Oxidation of Glucose in the Presence of PVP-Protected Colloidal Gold Solutions

Colloidal metal gold catalysts were prepared by reducing a base solution of chlorauric acid in the presence of a polyvinylpyrrolidone (PVP) stabilizer. The selective oxidation of glucose to gluconic acid in aqueous solution using molecular oxygen as an oxidant at atmospheric pressure was studied. The activity of the colloidal gold was measured as a function of the PVP amount and various chlorauric acid concentrations. The highest activity with 54.4% conversion of glucose was obtained at a PVP/Au mass ratio of 40 and a 100 μg/ml chlorauric acid concentration. UV-Visible absorption spectroscopy and transmission electron microscopy results showed that the stable gold colloids contain smaller gold nanoparticles. Adjusting the PVP amount and chlorauric acid concentration in the preparation of colloidal gold nanoparticles can achieve high catalytic avtivity for glucose oxidation.