Abstract
A strategy for the formation of magnetic NixFe3−xO4 hollow nanospheres with very high specific surface areas was designed through a facile solvothermal method in mixed solvents of ethylene glycol and water in this work. The Ni/Fe ratios and the crystal phases of the NixFe3−xO4 hollow nanocrystals can be readily tuned by changing the molar ratios of Ni to Fe in the precursors. An inside-out Ostwald ripening mechanism was proposed for the formation of uniform NixFe3−xO4 hollow nanospheres. Moreover, the obtained NixFe3−xO4 hollow nanospheres exhibited excellent adsorption capacity towards organic molecules such as Congo red in water. The maximum adsorption capacities of NixFe3−xO4 hollow nanospheres for Congo red increase dramatically from 263 to 500 mg g−1 with the increase of the Ni contents (x) in NixFe3−xO4 hollow nanospheres from 0.2 to 0.85. The synthesized NixFe3−xO4 nanoparticles can be potentially applied for waste water treatment.
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