Abstract
Magnetic spindle-like Fe3O4 mesoporous nanoparticles with a length of 200 nm and diameter of 60 nm were
successfully synthesized by reducing the spindle-like a-Fe2O3 NPs which were prepared by forced hydrolysis
method. The obtained samples were characterized by transmission electron microscopy, powder X-ray diffraction,
attenuated total reflection fourier transform infrared spectroscopy, field emission scanning electron microscopy,
vibrating sample magnetometer, and nitrogen adsorption-desorption analysis techniques. The results show that a-
Fe2O3 phase transformed into Fe3O4 phase after annealing in hydrogen atmosphere at 350°C. The as-prepared
spindle-like Fe3O4 mesoporous NPs possess high Brunauer-Emmett-Teller (BET) surface area up to ca. 7.9 m2 g-1. In
addition, the Fe3O4 NPs present higher saturation magnetization (85.2 emu g-1) and excellent magnetic response
behaviors, which have great potential applications in magnetic separation technology.
