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首页> 外文期刊>RSC Advances >Ni, Co and Ni-Co codoping induced modification in shape, optical band gap and enhanced photocatalytic activity of CeO2 nanostructures for photodegradation of methylene blue dye under visible light irradiation
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Ni, Co and Ni-Co codoping induced modification in shape, optical band gap and enhanced photocatalytic activity of CeO2 nanostructures for photodegradation of methylene blue dye under visible light irradiation

机译：Ni，Co和Ni-Co Copoping在CeO2纳米结构的形状，光学带隙和增强光催化活性的变形例中可见光照射下亚甲基蓝染料的光降解

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摘要

A simple method has been used to synthesize uneven sizes and shapes of CeO2 nanostructures by Ni, Co and Ni-Co codoping without using any surfactant. All the samples were further characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), energy dispersive X-ray spectroscopy (EDS), Raman spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, ultraviolet-visible (UV-VIS) spectroscopy and photoluminescence (PL) spectroscopy measurements. The Ni-Co codoped CeO2 nanostructures show broad absorption in the visible range (450-800 nm) as compared to undoped, Ni and Co doped CeO2 nanostructures. The broad absorption feature (visible range) has made it a suitable material for obtaining enhanced photocatalytic activity under visible light irradiation. Further, Ni-Co codoping reduces the value of the optical band gap of CeO2 nanostructures sharply from 3.46 to 2.5 eV. The recombination rate of photoinduced electrons and holes for Ni-Co codoped CeO2 nanostructures is significantly reduced. A more realistic mechanism for superior photocatalytic activity of the Ni-Co codoped CeO2 nanostructures is also proposed. In the CeO2 matrix, the Ni and Co ion sites may act as electron and hole trap centers, which essentially improve the separation efficiency of the photo-induced electrons and holes in the NiCo codoped CeO2 nanostructures.
机译：已经使用简单的方法来通过Ni，Co和Ni-Co Copoping合成CeO2纳米结构的不均匀尺寸和形状而不使用任何表面活性剂。通过X射线衍射（XRD），扫描电子显微镜（SEM），高分辨率透射电子显微镜（HR-TEM），能量分散X射线光谱（EDS），拉曼光谱，傅立叶变换红外线，所有样品进一步表征了所有样品。 （FT-IR）光谱，紫外 - 可见（UV-VI）光谱和光致发光（PL）光谱测量。与未掺杂的Ni和Co掺杂的CeO2纳米结构相比，Ni-Co Copoped CeO2纳米结构在可见范围（450-800nm）中显示出广泛的吸收。宽吸收特征（可见范围）使其成为在可见光照射下获得增强的光催化活性的合适材料。此外，Ni-Co Copoping将CeO2纳米结构的光带间隙的值从3.46从3.46到2.5eV急剧下降。光致电子和Ni-CoCopoped CeO2纳米结构的重组率显着降低。还提出了一种更现实的Ni-CoCoped CeO2纳米结构的优异光催化活性的机制。在CEO2矩阵中，Ni和Co离子位点可以用作电子和孔阱中心，这基本上提高了Nico Compoped CeO2纳米结构中的光诱导的电子和孔的分离效率。

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  • 来源
    《RSC Advances》 |2016年第11期|共10页
  • 作者

    Kumar Sachin; Ojha Animesh K.;

  • 作者单位

    Motilal Nehru Natl Inst Technol Dept Phys Allahabad 211004 Uttar Pradesh India;

    Motilal Nehru Natl Inst Technol Dept Phys Allahabad 211004 Uttar Pradesh India;

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  • 正文语种 eng
  • 中图分类 化学;
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