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Enhanced visible light photocatalytic activities of 3D Fe3O4@SiO2@ZnO/ZnS nanocomposites by assembling 2D graphene sheets
Physica E: Low-dimensional Systems and Nanostructures ( IF 3.3 ) Pub Date : 2021-08-11 , DOI: 10.1016/j.physe.2021.114926
Xiaoyan Liu 1, 2 , Ting Xu 1, 2 , Pengfei Wang 1, 2 , Jian Cao 1, 2 , Yanli Chen 1, 2 , Hougang Fan 1, 2 , Xiangwei Meng 1, 2 , Maobin Wei 1, 2 , Huilian Liu 1, 2 , Lili Yang 1, 2
Affiliation  

In this work, Fe3O4@SiO2@ZnO/ZnS-graphene nanocomposites were prepared via a convenient synthetic route. The SEM and TEM analysis confirmed the successful assembly of 3D Fe3O4@SiO2@ZnO/ZnS nanocomposites and 2D graphene sheets. In comparison with FSZZ, FSZZ-GR exhibited the lower bandgap value with a significant red-shift and enhanced visible light absorption. The effect of the assembling amount of graphene on the photocatalytic activity was systematically investigated. In the as-prepared photocatalysts, the FSZZ-GR5% sample showed the remarkably enhanced photocatalytic activity towards the degradation of TC under visible light irradiation, benefiting from the band structure of ZnO/ZnS and the incorporation of a proper number of graphene, which can facilitate the efficient separation and migration of photogenerated e-h pairs. The photocatalytic reaction occurred both on the surface of the type-II ZnO/ZnS core/shell heterostructure and the graphene sheets. As a result, the FSZZ-GR5% exhibited the synergistic enhanced photocatalytic performance; the possible photocatalytic mechanism was discussed in detail.



中文翻译:

通过组装二维石墨烯片增强 3D Fe3O4@SiO2@ZnO/ZnS 纳米复合材料的可见光光催化活性

在这项工作中,通过方便的合成路线制备了Fe 3 O 4 @SiO 2 @ZnO/ZnS-石墨烯纳米复合材料。SEM 和 TEM 分析证实了 3D Fe 3 O 4 @SiO 2 @ZnO/ZnS 纳米复合材料和 2D 石墨烯片的成功组装。与 FSZZ 相比,FSZZ-GR 表现出较低的带隙值,具有显着的红移和增强的可见光吸收。石墨烯组装量对光催化活性的影响进行了系统的调查。在所制备的光催化剂中,FSZZ-GR5% 样品在可见光照射下对 TC 的降解表现出显着增强的光催化活性,这得益于 ZnO/ZnS 的能带结构和适当数量的石墨烯的掺入,这可以促进光生eh对的有效分离和迁移。光催化反应发生在 II 型 ZnO/ZnS 核/壳异质结构和石墨烯片的表面。结果,FSZZ-GR5%表现出协同增强的光催化性能;详细讨论了可能的光催化机理。

更新日期:2021-08-24
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