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

机译：机械增强的ZnO / SnO 2 复合材料的自然日光和人工紫外线驱动的光催化活性同时增强

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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 °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：机械研磨商用ZnO和SnO 2 用于生产高密度的ZnO / SnO 2 复合材料表面缺陷;特别是锌间隙（Zn i ）和氧空位（ V O ）。为了确定表面缺陷对光催化活性的影响，通过在400和700°C下进行退火，来改变体缺陷与表面缺陷的相对浓度比。通过亚甲基蓝的脱色揭示了ZnO / SnO 2 复合物作为天然阳光和紫外线驱动的光催化剂的可能应用。 。在两种情况下，与原始ZnO相比，ZnO / SnO 2 复合物均表现出增强的光催化活性。为了研究增强的起源，使用多种技术对原始金属氧化物和复合材料进行了表征，包括X射线衍射（XRD），拉曼和傅里叶变换红外（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漫反射和光致发光光谱。高分辨率透射电子显微镜（HRTEM）和元素图谱分析揭示了较大的ZnO颗粒表面上存在SnO 2 纳米微晶。复合材料的光催化活性增强归因于表面缺陷与ZnO / SnO 2 异质结颗粒的协同作用，有利于电荷分离，从而阻碍了复合。光生载流子。这项研究引起了人们对机械活化的关注，机械活化是一种廉价且环保的技术，可在紫外线或阳光照射下大规模生产具有增强的光催化活性的复合材料。

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