文献类型：期刊文献

英文题名：Multifunctional Magnetic Composite Microspheres with in Situ Growth Au Nanoparticles: A Highly Efficient Catalyst System

作者：Zhu, Yihua[1];Shen, Jianhua[1];Zhou, Kangfu[1];Chen, Cheng[1];Yang, Xiaoling[1];Li, Chunzhong[1]

机构：[1]E China Univ Sci & Technol, Key Lab Ultrafine Mat, Minist Educ, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2011

卷号：115

期号：5

起止页码：1614

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY C

收录：;EI(收录号：20111213760019);WOS:【SCI-EXPANDED(收录号:WOS:000286868600034)】；

基金：This work was supported by the National Natural Science Foundation of China (20925621, 20976054), the Key Project of Science and Technology for Ministry of Eductation (107045), the Innovation Program of Shanghai Municipal Education Commission (09ZZ58), the Program of Shanghai Subject Chief Scientist (08XD1401500), and the Program for Changjiang Scholars and Innovative Research Team in University (IRT0825).

语种：英文

外文关键词：Magnetite - Magnetite nanoparticles - Surface chemistry - Gold nanoparticles - Self assembly - Nanomagnetics - Reusability - Silica

摘要：Multifunctional magnetic composite microspheres which possess the precise control of the size, morphology, surface chemistry, and assembly process of each component have been successfully prepared. These functional nano composite microspheres possess a core of silica-protected magnetite particles and in situ growth active gold nanoparticles (ca. 4 nm) on the outer shell by layer-by-layer electrostatic self-assembly. The well-designed microspheres have high magnetization (23.9 emu/g), uniform sphere size (ca. 500 nm), and stably confined and active small Au nanoparticles. As a result, the very little composite microspheres show high performance in catalytic reduction of 4-nitrophenol (with conversion of 95% in 12 min), special convenient magnetic separability, long life, and good reusability. The unique nanostructure makes the microsphere a novel stable and highly efficient catalyst system for various catalytic industry processes.