期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 21, 期 18, 页码 6879-6887出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201405921
关键词
heterogeneous catalysis; magnetic properties; metal-organic frameworks; nanoparticles; synthesis design
资金
- Major State Basic Research Development Program of China [2011CB932404]
- National Science Foundation of China [21222107, 21471058]
- Shanghai Rising-Star Program [13A1401400]
- Youth Talent Plan (Organization Department of the Central Committee of the CPC)
Fe3O4/ZIF-8 nanoparticles were synthesized through a room-temperature reaction between 2-methylimidazolate and zinc nitrate in the presence of Fe3O4 nanocrystals. The particle size, surface charge, and magnetic loading can be conveniently controlled by the dosage of Zn(NO3)(2) and Fe3O4 nanocrystals. The as-prepared particles show both good thermal stability (stable to 550 degrees C) and large surface area (1174 m(2)g(-1)). The nanoparticles also have a superparamagnetic response, so that they can strongly respond to an external field during magnetic separation and disperse back into the solution after withdrawal of the magnetic field. For the Knoevenagel reaction, which is catalyzed by alkaline active sites on external surface of catalyst, small Fe3O4/ZIF-8 nanoparticles show a higher catalytic activity. At the same time, the nanocatalysts can be continuously used in multiple catalytic reactions through magnetic separation, activation, and redispersion with little loss of activity.
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