内含Fe3O4和金纳米粒子的碳化微球的制备及其催化性能  

PREPARATION OF CARBON MICROSPHERES WITH EMBEDDED Fe_3O_4 AND GOLD NANOPARTICLES AND THEIR CATALYTIC PROPERTY

作　　者：刘艳[1] 徐振华[1] 阎虎生[1] 

机构地区：[1]南开大学高分子化学研究所,功能高分子材料教育部重点实验室,天津300071

出　　处：《离子交换与吸附》2011年第5期385-391,共7页Ion Exchange and Adsorption

基　　金：国家自然科学基金(20374028)

摘　　要：通过蒸馏-沉淀聚合制备了丙烯酸-二乙烯苯共聚物微球,经离子交换吸附Fe2+离子,然后通过空气中加热、氩气气氛中高温碳化得到了含Fe3O4纳米粒子的多孔磁性碳化微球。在水介质中多孔磁性碳化微球吸附氯金酸,然后还原得到内含金纳米粒子的磁性碳化微球。以硼氢化钠还原对硝基苯酚生成对氨基苯酚反应为例,研究了内含金纳米粒子的磁性碳化微球的催化作用。结果表明,内含金纳米粒子的磁性碳化微球对该反应有很好的催化作用。通过外磁场很容易将磁性微球从反应液相中分离出来,微球重复使用10次后其催化活性基本未变。Acrylic acid-divinylbenzene copolymer microspheres were prepared by distillation-precipitation copolymerization. Fe^2＋ ions were taken up by the copolymeric microspheres by ion-exchange process. The resulting Fe^2＋-containing microspheres were heated in air and then annealed under inert atmosphere to give magnetic carbon microspheres with embedded Fe3O4 nanoparticles. Tetrachloroauric acid was adsorbed by the magnetic carbon microspheres in aqueous medium. After reduction, the adsorbed ionic gold in the microspheres was transformed into gold nanoparticles. The catalytic property of the gold nanoparticle-immobilized magnetic carbon microspheres was investigated using the reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride as a model reaction. The catalyst microspheres could be separated by an external magnetic field. The catalyst could be reused for over ten cycles without noticeable loss of its catalytic activity.

关 键 词：聚合物微球 碳 磁性 金纳米粒子 催化 

分 类 号：TQ425[化学工程]