Abstract
This paper reports on the microwave–hydrothermal ionic liquid method for the synthesis of a variety of iron oxide nanostructures such as α-FeOOH hollow spheres, β-FeOOH architectures and α-Fe 2O 3 nanoparticles. The formation mechanism for α-FeOOH hollow spheres is discussed. The effects of the reaction parameters on the morphology and crystal phase of the final product are studied. The relationship between the morphology and crystal phase of the product is discussed. A general thermal transformation strategy is designed to prepare α-Fe 2O 3 hollow spheres using α-FeOOH hollow spheres as the precursor and template. By thermal treatment of the as-prepared α-FeOOH hollow spheres, α-Fe 2O 3 hollow spheres showing good photocatalytic activity are obtained. And by autocatalysis of the adsorbed available Fe(II) on the α-FeOOH surfaces, Fe 3O 4 hollow spheres are also obtained.
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