General synthesis of magnetic mesoporous FeNi/graphitic carbon nanocomposites and their application for dye adsorption

摘要

A series of magnetic mesoporous FeNi/graphitic carbon nanocomposites have been synthesized through a simple nanocasting method using mesoporous silica SBA-15 as the template. Metal nitrates and natural soybean oil are respectively used as the magnetic particle precursors and carbon source, which can be infiltrated into the silica template after impregnation, grinding mix and heat treatment. X-ray diffraction, nitrogen adsorption-desorption, inductively coupled plasma mass spectrometry, transmission electron microscopy, vibrating-sample magnetometry and thermogravimetric analysis techniques are used to characterize the samples. It is observed that high content of magnetic FeNi alloy nanocrystals with the sizes of about 3-6 nm are well homodispersed into the walls of graphitic mesoporous carbon matrix, and the resulting nanocomposites have a uniform mesostructure with a high specific surface area, large pore volume, and high saturation magnetization. Because of these characteristics, the obtained magnetic mesoporous FeNi/graphitic carbon nanocomposites can be used as efficient and recycled adsorbents in the removal of dye from wastewater. (C) 2014 Elsevier B.V. All rights reserved.