硫醚功能化离子液体固定纳米金粒子的制备及其催化性能

Preparation and Catalytic Performance of Gold Nanoparticles Stabilized by Thioether-Functionalized Ionic Liquid

合成了一种新型的硫醚功能化离子液体(TFIL),以其为稳定剂在1-甲基-3-丁基咪唑六氟磷酸离子液体中制备了TFIL固定的纳米金粒子(GNP-TFIL)催化剂.采用红外光谱、紫外-可见光谱和透射电子显微镜等方法对GNP-TFIL催化剂进行了表征.结果表明,TFIL在固定纳米金粒子之后仍保持着离子液体的基本结构;纳米金粒子的分布均匀,粒径为2.0～3.6nm.GNP-TFIL催化剂对苯乙烯环氧化反应具有较高的催化活性,且可以重复使用.在45℃下反应6h时,苯乙烯的转化率和环氧苯乙烷的选择性分别可达100%和88.5%.

A novel thioether-functionalized ionic liquid （TFIL） was synthesized and applied as a stabilizer for the preparation of gold nanoparticles （GNP） in the ionic liquid of 1-n-butyl-3-methylimidazolium hexafluorophosphate. GNP stabilized by TFIL （GNP-TF1L） were characterized by Fourier transform infrared spec- troscopy, ultraviolet-visible spectroscopy, and transmission electron microscopy, GNP-TFIL remained the structure of TFIL after GNP was stabilized by TFIL. GNP-TFIL displayed an interface resonance absorption appearing around 526 nm, which suggests the formation of GNP. GNP stabilized by TFIL could be dispersed uniform- ly with the particle size of 2.0-3.6 nm. GNP exhibited high catalytic activity in the epoxidation of styrene and could be reused. The conversion of styrene and the selectivity for styrene oxide were as high as 100% and 88.5 %, respectively, when the reaction was performed at 45 ℃ for 6 h using 3-chloroperoxybenzoic acid as the oxidant.