ZnFe2O4/SnS2异质结的构建及光催化性能研究

ZnFe₂O₄/SnS₂异质结的构建及光催化性能研究

李  祥，王  晶，李兴华，朱秀红^*，冯  娟^*，彭  勇^*

（1．西北大学物理学院，陕西 西安710069；2．兰州大学电镜中心，甘肃 兰州730000）

摘  要  本文将单分散且尺寸可控的ZnFe₂O₄磁性纳米颗粒均匀分散于二维SnS₂纳米片；构建ZnFe₂O₄/SnS₂二元异质结。TEM结果显示，该方法制备的ZnFe₂O₄磁性纳米颗粒尺寸较小，分布均匀，且颗粒没有发生团聚现象，平均尺寸为14 nm，在异质结复合材料中，ZnFe₂O₄纳米颗粒分散性良好，均匀地负载在SnS₂的表面；ZnFe₂O₄纳米颗粒的饱和磁化强度Ms=71.2 emu/g，矫顽力Hc=1.94 Oe；异质结样品的饱和磁化强度Ms=13.6 emu/g。同时发现，将ZnFe₂O₄磁性纳米颗粒应用于光催化领域，可以提高异质结的光催化性能，相比纯SnS₂而言，ZnFe₂O₄/SnS₂异质结的光催化降解的速率提高了1.8倍，在3h 内可以有效的降解87.5%的Rh B水溶液；而且该催化剂的磁性还可以增强光催化剂的重复利用率，这对催化和能源领域具有重要的研究价值。

关键词   铁酸锌；二硫化锡; 异质结; 透射电子显微镜；磁性纳米颗粒

中图分类号：TB34；X52；TB332  文献标识码：Adoi:10.3969/j.issn.1000-6281.2022.03.002

Construction and properties of ZnFe₂O₄/SnS₂ heterojunction

LI Xiang¹，WANG Jing¹，LI Xing-hua¹，ZHU Xiu-hong¹*，FENG Juan¹*，PENG Yong^2*

（1．Northwest University, Xi’an Shaanxi 710069；2. Electron Microscopy Centre of Lanzhou University，Lanzhou University，Lanzhou Gansu 730000，China）

Abstract  In this paper, monodisperse and size controllable ZnFe₂O₄ magnetic nanoparticles were uniformly dispersed on two-dimensional SnS₂nanosheets.The ZnFe₂O₄/SnS₂ binary heterojunction was constructed by polyhydroxyl method. TEM results show that the size of ZnFe₂O₄ magnetic nanoparticles is small and evenly distributed, and the particles do not agglomerate, and the average size of ZnFe₂O₄ is 14 nm. In the heterostructure composites, ZnFe₂O₄ nanoparticles had good dispersion and were uniformly loaded on the surface of SnS₂.The saturation magnetization of ZnFe₂O₄ nanoparticles was Ms=71.2 emu/g and coercivity He=1.94 Oe. The saturation magnetization of the heterojunction sample was M_S =13.6 emu/g. It is also found that the application of ZnFe₂O₄ magnetic nanoparticles in the field of photocatalysis can improve the photocatalytic performance of heterostructures. Compared with pure SnS₂, the photocatalytic degradation rate of ZnFe₂O₄/SnS₂heterostructures is 1.8 times higher, and 87.5% Rh B aqueous solution can be effectively degraded within 3h. Moreover, the magnetic properties of the catalyst can also enhance the photocatalyst reuse rate, which has important research value in the fields of catalysis and energy.

Keywords   ZnFe₂O₄；SnS₂；heterojunction；transmission electron microscope (TEM)；magnetic nanoparticles

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