采用聚苯乙烯(PS)包裹Fe3O4磁性纳米粒子,制得Fe3O4@PS复合微球,以此作为磁性载体,通过微球表面的羧基将聚酰胺-胺类树形大分子(PAMAM)连接到磁性载体上,然后使Ag纳米粒子镶嵌在树形分子层中,制得可再生的金属复合催化粒子Fe3O4@PS@PAMAM-Ag.并采用红外光谱、扫描电镜、电感耦合等离子体质谱(ICP-MS)和X射线光电子能谱等方法对复合催化粒子进行了表征,结果表明,树形分子可以较好地分散和稳定金属Ag纳米粒子,所制复合催化粒子表面Ag含量为1.64％,具有较高的催化还原对硝基苯酚的活性.同时,利用外加磁场可以方便快捷地从反应体系中分离出来,继续用于下一次反应中,复合催化粒子循环使用6次后,仍保持完全的催化性能.
Magnetic supports were prepared by coating Fe3O4 nanoparticles with polystyrene (PS).The target nanocomposites were formed by growing polyamidoamine (PAMAM) dendrimers on the magnetic polymer supports with carboxylic groups and then silver nanoparticles were embedded into the PAMAM dcndrimcr shell.In this way recoverable Fe3O4@PS@PAMAM-Ag nanocomposites were successfully prepared.The magnetic nanocatalysts were characterized by Fourier transform infrared spectra,scanning electron microscopy,inductively coupled plasma,and X-ray photoelectron spectroscopy.The results demonstrated that the PAMAM dendrimer shell immobilized on the magnetic supports was beneficial for dispersion and stabilization of the silver nanoparticles.The silver content of the Fe3O4@PS@PAMAM(G7)-Ag nanoparticles was 1.64 wt％.The catalytic activity of the Fe3O4@PS@PAMAM-Ag nanocomposites was proved using the reduction of 4-nitrophenol as a model catalytic reaction.The nanocomposites could be readily separated by magnetic separation and reused for the next reduction with high efficiency.The catalytic activity remained completely even after the nanocatalyst had been recycled six times.
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