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首页> 外文期刊>RSC Advances >Simultaneous enhancement of natural sunlightand artificial UV-driven photocatalytic activity of a mechanically activated ZnO/SnO2 composite
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Simultaneous enhancement of natural sunlightand artificial UV-driven photocatalytic activity of a mechanically activated ZnO/SnO2 composite

机译：机械活性ZnO / SnO2复合材料的自然阳光和人工UV驱动光催化活性的同时增强

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摘要

Mechanical milling of commercial ZnO and SnO2 was used to produce a ZnO/SnO2 composite with a high density of surface defects; in particular, zinc interstitials (Zni) and oxygen vacancies (VO). To determine the impact of surface defects on photocatalytic activity, the relative concentration ratio of bulk defects to surface defects was modified by annealing at 400 and 700 degrees C. The possible application of the ZnO/SnO2 composite as a natural sunlight and UV- light driven photocatalyst was revealed via de-colorization of methylene blue. In both cases the ZnO/SnO2 composite exhibited enhanced photocatalytic activity as compared to the pristine ZnO. In order to investigate the origin of the enhancement, the pristine metal oxides and composites were characterized using a variety of techniques, including X-ray diffraction (XRD), Raman and Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), laser diffraction particle size analysis, Brunauer-Emmett-Teller, UV-Vis diffuse reflectance and photoluminescence spectroscopy. High-resolution transmission electron microscopy (HRTEM) and elemental mapping analyses were used to reveal the presence of SnO2 nanocrystallites on the surface of larger ZnO particles. The enhanced photocatalytic activity of the composite can be attributed to the synergetic effect of the surface defects and the ZnO/SnO2 heterojunction particles, which facilitated charge separation, thereby hindering the recombination of photogenerated carriers. This study draws attention to mechanical activation as an inexpensive and environmentally friendly technique for the large-scale production of the composite with an enhanced photocatalytic activity under illumination of either UV or sunlight.
机译：使用商业ZnO和SnO2的机械研磨用于生产具有高密度表面缺陷的ZnO / SnO2复合材料;特别是，锌间质性（ZnI）和氧气空位（VO）。为了确定表面缺陷对光催化活性的影响，通过在400和700摄氏度的退火通过退火来改变散装缺陷对表面缺陷的相对浓度比。ZnO / SnO2复合材料作为自然阳光和UV光驱动的可能施加光催化剂通过亚甲基蓝的缩编揭示。在两种情况下，与原始ZnO相比，ZnO / SnO2复合材料表现出增强的光催化活性。为了研究增强的来源，使用各种技术表征原始金属氧化物和复合材料，包括X射线衍射（XRD），拉曼和傅立叶变换红外（FTIR）光谱，场发射扫描电子显微镜（FESEM） ），激光衍射粒度分析，Brunauer-Emmett-Teller，UV-Vis弥射反射和光致发光光谱。高分辨率透射电子显微镜（HRTEM）和元素映射分析用于揭示在较大ZnO颗粒表面上的SnO2纳米晶体的存在。复合材料的增强的光催化活性可归因于表面缺陷和ZnO / SnO2异质结颗粒的协同作用，其促进了电荷分离，从而阻碍了光生载体的重组。本研究提请注意机械激活，作为廉价和环保的技术，用于在紫外线或阳光照射下具有增强的光催化活性的复合材料的大规模生产。

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