Abstract
We report a one-pot hydrothermal method for novel mesoporous Fe3O4 nanoparticles (NPs) preparation based on the reduction of ferric chloride with bifunctional agent: tannic acid (TA). TA acted both as template agent to obtain the mesoporous structure and functional agent to modify Fe3O4 NPs. The facile controlled process resulted in a relatively high surface area (99.5 m2 g−1) and good monodispersity with average diameter ∼200 nm of the synthetic nanoparticles. The high saturation magnetization (54.7 emu g−1) of the nanoparticles made it can be separated quickly from solution media via a magnet. The unique mesoporous structure of the Fe3O4 nanoparticles possessed high active site, and this was proved by studying the catalytic properties through Fenton catalytic degradation with hydrogen peroxide as a model reaction system. As a result, the tannic acid templated mesoporous Fe3O4 NPs (TA–Fe3O4 NPs) showed the very efficient catalytic properties for the degradation of methylene blue (MB) accelerated by the functionalization of TA.
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