Authors: Liyun Zheng Shuling Wang Lixin Zhao Shuguo Zhao
Publish Date: 2016/11/07
Volume: 18, Issue: 11, Pages: 318-
Abstract
Core/shell Fe3O4/BiOI nanoparticles with BiOI sheath have been synthesized by a solvothermal reaction method and were characterized by transmission electron microscopy TEM with an energy dispersive spectrum EDS highresolution TEM and Xray diffraction XRD Their photocatalytic activities were evaluated by methylene blue MB under the simulated solar light The results indicate that the spherical Fe3O4 particles were coated with BiOI sheath when the sample were synthesized at 160 °C with ethylene glycol and deionized water forming a core/shell structure The degradation rate of MB assisted with the core/shell Fe3O4/BiOI catalysts reached 98 after 40min irradiation The catalytic performance enhancement of the core/shell Fe3O4/BiOI catalysts mainly attributes to the band structure that can improve the generation efficiency separation and transfer process of the photoinduced electron–hole pairs and decrease their recombination The magnetic Fe3O4 core not only contributes to the efficient separation of electron and holes but also helps catalysts be collected conveniently using a magnet for reuse After five repeated trials the degradation rate of MB still maintains over 90 and the saturated magnetization of the catalysts remains 515 emu/g which indicate that the core/shell Fe3O4/BiOI nanoparticles have excellent photocatalytic stability and are recyclable for decomposing organic pollutants under visible light irradiation
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