Shtarev Dmitry S, Shtareva Anna V, Kevorkyants Ruslan, Syuy Alexander V
Yu. A. Kosygin Institute of Tectonics and Geophysics, Far Eastern Branch of the Russian Academy of Sciences, 65 Kim Yu Chen Street, Khabarovsk, 680000, Russia; Far Eastern State Transport University, 47 Seryshev Street, Khabarovsk, 680021, Russia.
Yu. A. Kosygin Institute of Tectonics and Geophysics, Far Eastern Branch of the Russian Academy of Sciences, 65 Kim Yu Chen Street, Khabarovsk, 680000, Russia.
Chemosphere. 2021 Mar;267:129229. doi: 10.1016/j.chemosphere.2020.129229. Epub 2020 Dec 5.
We report on the structure and properties of novel SrBiO/SrCO and SrBiO/SrCO heterostructures with SrCO content varying from 10 wt% to 90 wt%. Formation of the heterostructures is succeeded via sintering technique and according to XRD, SEM, and EDX studies has resulted in highly crystalline materials with well-defined carbonate-bismuthate interfaces. In the reaction of photodegradation of phenol in aqueous solution the heterostructures demonstrated photocatalytic activity exceeding that of TiO. It is demonstrated that their photocatalytic action is due to the presence of type II semiconductor heterojunctions. The content of SrCO ensuring utmost photocatalytic activity is explained based on numerical modeling of the heterostructures' formation using 'Unity' development platform. In addition, the heterostructures show photoluminescence. Its mechanism proposed here implies permeability of the materials' heterojunctions to electrons. This work describes new materials that can be used for photodegradation of organic pollutants. Besides, it extends available principles of design of photocatalytically active heterostructures.
我们报道了具有不同SrCO含量（从10 wt%到90 wt%）的新型SrBiO/SrCO和SrBiO/SrCO异质结构的结构和性质。通过烧结技术成功形成了异质结构，根据X射线衍射（XRD）、扫描电子显微镜（SEM）和能谱分析（EDX）研究，得到了具有清晰碳酸铋酸盐界面的高结晶度材料。在水溶液中苯酚的光降解反应中，这些异质结构表现出超过TiO的光催化活性。结果表明，它们的光催化作用归因于II型半导体异质结的存在。基于使用“Unity”开发平台对异质结构形成的数值模拟，解释了确保最大光催化活性的SrCO含量。此外，这些异质结构还表现出光致发光。这里提出的其机制意味着材料异质结对电子具有渗透性。这项工作描述了可用于光降解有机污染物的新材料。此外，它扩展了光催化活性异质结构的现有设计原理。
