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Controlled Synthesis of Fe 3 O 4 /ZIF‐8 Nanoparticles for Magnetically Separable Nanocatalysts
Author(s) -
Pang Fei,
He Mingyuan,
Ge Jianping
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201405921
Subject(s) - nanomaterial based catalyst , superparamagnetism , catalysis , nanoparticle , thermal stability , chemical engineering , particle size , materials science , nanocrystal , magnetic separation , magnetic nanoparticles , inorganic chemistry , chemistry , nanotechnology , magnetization , magnetic field , organic chemistry , physics , quantum mechanics , engineering , metallurgy
Fe 3 O 4 /ZIF‐8 nanoparticles were synthesized through a room‐temperature reaction between 2‐methylimidazolate and zinc nitrate in the presence of Fe 3 O 4 nanocrystals. The particle size, surface charge, and magnetic loading can be conveniently controlled by the dosage of Zn(NO 3 ) 2 and Fe 3 O 4 nanocrystals. The as‐prepared particles show both good thermal stability (stable to 550 °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 Fe 3 O 4 /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.