磁性 Fe3O4@PS@PAMAM-Ag 复合催化粒子的制备及其可再生催化性能

doi:10.1016/S1872-2067(11)60369-0

催化学报 ›› 2012, Vol. 33 ›› Issue (4): 651-658.DOI: 10.1016/S1872-2067(11)60369-0

磁性 Fe₃O₄@PS@PAMAM-Ag 复合催化粒子的制备及其可再生催化性能

党高飞, 石艳*, 付志峰, 杨万泰

北京化工大学化工资源有效利用国家重点实验室, 北京 100029

收稿日期:2011-10-30 修回日期:2011-12-14 出版日期:2012-04-13 发布日期:2015-09-09

Fe₃O₄@PS@PAMAM-Ag Magnetic Nanocatalysts and Their Recoverable Catalytic Ability

DANG Gaofei, SHI Yan*, FU Zhifeng, YANG Wantai

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Received:2011-10-30 Revised:2011-12-14 Online:2012-04-13 Published:2015-09-09

摘要/Abstract

摘要： 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.

关键词: 磁性, 可再生催化, 聚酰胺-胺类树形分子, 银, 对硝基苯酚

Abstract: Magnetic supports were prepared by coating Fe₃O₄nanoparticles 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 dendrimer 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.

Key words: magnetism, recoverable catalysis, polyamidoamine dendrimer, silver, p-nitrophenol

党高飞, 石艳, 付志峰, 杨万泰. 磁性 Fe₃O₄@PS@PAMAM-Ag 复合催化粒子的制备及其可再生催化性能[J]. 催化学报, 2012, 33(4): 651-658.

DANG Gao-Fei, SHI Yan, FU Zhi-Feng, YANG Wan-Tai. Fe₃O₄@PS@PAMAM-Ag Magnetic Nanocatalysts and Their Recoverable Catalytic Ability[J]. Chinese Journal of Catalysis, 2012, 33(4): 651-658.

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磁性 Fe₃O₄@PS@PAMAM-Ag 复合催化粒子的制备及其可再生催化性能

Fe₃O₄@PS@PAMAM-Ag Magnetic Nanocatalysts and Their Recoverable Catalytic Ability

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