Novel and recyclable superparamagnetic adsorbent Fe3O4-O-CMK-3 was synthesized by in situ growth of nanometer sized magnetite particles (m-NPs) on the surface of mesoporous carbon at low temperature (70°C) using ecologically-benign materials. Structural characterization by transmission electron microscopy (TEM) confirmed the formation of m-NPs surrounded by an oxidized mesoporous carbon layer ~20 nm thick. Thermogravimetric analysis (TGA) results revealed dense carboxylic groups and phenolic groups on the surface of Fe3O4-O-CMK-3. Because of these abundant polar groups the Fe3O4-O-CMK-3 had stronger adsorption affinity towards Cs than did magnetic mesoporous carbons O-Fe-CMK-3 synthesized by impregnation, and Fe-O-CMK-3 synthesized by co-casting, even in the presence of high concentrations of competing cations (K+, Na+, Li+, and Ca2+). The Fe3O4-O-CMK-3 adsorbent reached a steady state quickly (&lt;5 min) with maximum adsorption capacity of 205 mg g-1 which is sufficiently higher than other magnetic adsorbents (usually lower than 110 mg g-1) reported in the literature. The synthesized nanostructure adsorbent could be retrieved in a few seconds using an external magnet and reused several times for contaminant removal.

Recyclable superparamagnetic adsorbent based on mesoporous carbon for sequestration of radioactive cesium

253rd National Meeting (2017)

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