期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 115, 期 5, 页码 1614-1619出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp109276q
关键词
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资金
- National Natural Science Foundation of China [20925621, 20976054]
- Key Project of Science and Technology for Ministry of Eductation [107045]
- Shanghai Municipal Education Commission [09ZZ58]
- Program of Shanghai Subject Chief Scientist [08XD1401500]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0825]
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.
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