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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.
Fe3O4 @ PS composite microspheres were prepared by polystyrene (PS) encapsulation of Fe3O4 magnetic nanoparticles. Using this as a magnetic carrier, the polyamide - amine dendrimer (PAMAM) was connected to the magnetic The Ag nanoparticles were then embedded in the dendrimer layer to produce Fe3O4 @ PS @ PAMAM-Ag, a metal catalytic composite. The catalytic activity of Fe3O4 @ PS @ PAMAM-Ag was investigated by using infrared spectroscopy, scanning electron microscopy, inductively coupled plasma mass spectrometry ) And X-ray photoelectron spectroscopy (XPS) were used to characterize the composite catalytic particles. The results showed that the dendrimer could disperse and stabilize the metal Ag nanoparticles well. The content of Ag on the composite catalytic particles was 1.64% Of the catalytic reduction p-nitrophenol activity at the same time, the use of an external magnetic field can be quickly and easily separated from the reaction system, continue to be used in the next reaction, the composite catalytic particles recycling 6 times, still maintain the full catalytic performance.