One-step solvothermal synthesis of Fe _3O _4@C core-shell nanoparticles with tunable sizes

摘要

We report the synthesis of Fe _3O _4@C coreshell nanoparticles (FCNPs) by using a facile one-step solvothermal method. The FCNPs consisted of Fe _3O _4 particles as the cores and amorphous uniform carbon shells. The content of Fe _3O _4 is up to 81.6wt%. These coreshell nanoparticles are aggregated by primary nanocrystals with a size of 1012nm. The FCNPs possess a hollow interior, high magnetization, excellent absorption properties and abundant surface hydroxyl groups. A possible growth mechanism of the FCNPs is proposed. The role of glucose in regulating the grain size and morphology of the particles is discussed. The absorption properties of the FCNPs towards Cr(VI) in aqueous solution is investigated. We demonstrate that the FCNPs can effectively remove more than 90wt% of Cr(VI) from aqueous solution.