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 α-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 α-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.
Highlights
In the past few decades, porous materials have been used in many fields, such as filters, catalysts, cells, supports, optical materials, and so on [1,2,3]
Iron oxide nanomaterials have been extensively studied by material researchers in recent years, due to their novel physicochemical properties and advantages and wide applications in many fields [9,10,11,12,13,14,15,16]
Forced hydrolysis method has been widely used for preparing a-Fe2O3 NPs since the first study by Matijevic et al [4] and Cornell and Schwertmann [27]
Summary
In the past few decades, porous materials have been used in many fields, such as filters, catalysts, cells, supports, optical materials, and so on [1,2,3]. The results reveal that spindle-like Fe3O4 mesoporous NPs could be obtained after annealing at 350°C.
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