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Preparation and photocatalytic properties of magnetically reusable Fe3O4@ZnO core/shell nanoparticles

2015; Elsevier BV; Volume: 75; Linguagem: Inglês

10.1016/j.physe.2015.08.040

1873-1759

Jian Wang, Jinghai Yang, Xiuyan Li, Dandan Wang, Wei Bing, Hang Song, Xuefei Li, Siwei Fu,

Copper-based nanomaterials and applications

Fe3O4@ZnO binary nanoparticles were synthesized by a simple two-step chemical method and characterized using various analytical instruments. TEM result proved the binary nanoparticles have core/shell structures and average particle size is 60 nm. Photocatalytic investigation of Fe3O4@ZnO core/shell nanoparticles was carried out using rhodamine B (RhB) solution under UV light. Fe3O4@ZnO core/shell nanoparticles showed enhanced photocatalytic performance in comparison with the as prepared ZnO nanoparticles. The enhanced photocatalytic activity for Fe3O4@ZnO might be resulting from the higher concentration of surface oxygen vacancies and the suppressing effect of the Fe3+ ions on the recombination of photoinduced electron–hole pairs. Magnetization saturation value (5.96 emu/g) of Fe3O4@ZnO core/shell nanoparticles is high enough to be magnetically removed by applying a magnetic field. The core/shell photocatalyst can be easily separated by using a commercial magnet and almost no decrease in photocatalytic efficiency was observed even after recycling six times.