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首页> 外文期刊>RSC Advances >Perovskite-type KTaO3-reduced graphene oxide hybrid with improved visible light photocatalytic activity
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Perovskite-type KTaO3-reduced graphene oxide hybrid with improved visible light photocatalytic activity

机译：钙钛矿型KtaO3-还原的石墨烯氧化物杂种，具有改进的可见光光催化活性

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摘要

Novel rGO-KTaO3 composites with various graphene content were successfully synthesized using a facile solvothermal method which allowed both the reduction of graphene oxide and loading of KTaO3 nanocubes on the graphene sheets. The as-prepared photocatalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDX), Fourier transform infrared spectroscopy (FT-IR), Brunauer- Emmett-Teller (BET) specific surface area, X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), UV-Vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) emission spectroscopy. The obtained rGO-KTaO3 composites showed greatly improved photocatalytic performance for degradation of phenol under visible light irradiation (λ > 420 nm) over pristine KTaO3 which could be related to the photosensitizer role of graphene in the rGO-KTaO3 composites as well as the formation of p-n heterojunctions between KTaO3 nanocubes and rGO sheets. The highest photocatalytic activity in phenol degradation reaction was observed for rGO-KTaO3 hybrid with 30 wt% graphene. The enhanced photoactivity of this composite could be attributed to the synergistic effect of several factors such as: small crystallite size, extended absorption range in the visible spectrum and intimate contact between graphene and KTaO3 cubes.
机译：新颖RGO-KTaO3复合材料与各种石墨烯含量使用这使氧化石墨烯和石墨烯片KTaO3纳米立方体的装载所述减少了容易溶剂热法成功地合成。通过X射线衍射（XRD），所制备的光催化剂进行了表征透射电子显微镜（TEM），扫描电子显微镜（SEM）的能量分散型X射线分析（EDX），傅里叶变换红外光谱（FT-IR）， Brunauer-埃米特 - 特勒（BET）比表面积，X射线光电子能谱（XPS），热重分析（TGA），紫外可见漫反射光谱（DRS）和光致发光（PL）发射光谱。将所得到的RGO-KTaO3复合材料表现出大大提高的可见光照射下苯酚的降解的光催化性能（λ> 420纳米）上的原始KTaO3这可能与在RGO-KTaO3石墨烯的光敏剂作用复合材料以及形成KTaO3纳米立方体和RGO片之间的pn异质结。观察到苯酚降解反应中的光催化活性最高为RGO-KTaO3混合，用30％（重量）的石墨烯。该复合体的增强的光催化活性可以归因于几个因素的协同效果，例如：微晶尺寸小，在可见光谱扩展吸收范围和石墨烯和KTaO3立方体之间的紧密接触。

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  • 来源
    《RSC Advances》 |2015年第111期|共11页
  • 作者

    B. Bajorowicz; J. Reszczynska; W. Lisowski;

  • 作者单位

    Department of Environmental Technology Faculty of Chemistry University of Gdansk 80-308 Gdansk Poland.;

    Department of Environmental Technology Faculty of Chemistry University of Gdansk 80-308 Gdansk Poland.;

    Mazovia Center for Surface Analysis Institute of Physical Chemistry Polish Academy of Sciences 01-224 Warsaw Poland;

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  • 正文语种 eng
  • 中图分类 化学;
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