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Construction of H4xK2xSn2-xS4+x/TiO2 nanocomposites with enhanced visible light-driven photocatalytic performance

机译：具有增强的可见光光催化性能H4XK2XSN2-XS4 + X / TiO2纳米复合材料的施工

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摘要

In this paper, a new photocatalyst with TiO2 nanospheres decorated on ultrathin layered thiostannate H4xK2xSn2-xS4+x (X = 0.5-0.6, HKTS) nanosheets was successfully synthesized by a facile solvothermal method combined with the hydrolysis of tetrabutyl titanate and it was denoted as HKTS/TiO2. By adjusting the content of tetrabutyl titanate, composites with different Sn/Ti molar ratios were prepared. The composites were applied for RhB degradation under visible light irradiation, and the optimum proportion of HKTS/TiO2 was obtained. The results of X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy and scanning electron microscopy confirmed that TiO2 was successfully decorated on HKTS nanosheets. The combination of TiO2 and HKTS extended the absorption wavelength of TiO2 from UV to visible light range, and the separation efficiency of photoexcited electron-hole pairs was also enhanced. The photocatalytic degradation rate of RhB over HKTS/TiO2-1.0 was almost 97.9% after 60 min illumination, which was higher than those of HKTS and pure TiO2. The photocatalyst exhibited excellent reusability and stability as the degradation rate of RhB was 95.7% even after three cycles. The photocatalytic mechanism experiment indicated that center dot O-2(-) and h(+) played a dominant role in the photocatalytic process. All these results indicate that the newly fabricated HKTS/TiO2 composites provide a high-performance photocatalyst for waste water treatment, and the application of thiostannate can be extended to the field of photocatalytic materials.
机译：在本文中，通过将溶液的溶剂热法成功地合成了在超薄层状Thiostannate H4XK2XSN2-XS4 + X（X = 0.5-0.6，HKT）纳米液中的新型光催化剂，并用钛酸四丁基四丁基的水解成功地合成了纳米晶片。 HKTS / TiO2。通过调节钛酸四丁酯的含量，制备具有不同Sn / Ti摩尔比的复合材料。在可见光照射下施用复合材料以获得RHB降解，并获得HKT / TiO 2的最佳比例。 X射线衍射，拉曼光谱，傅立叶变换红外光谱和扫描电子显微镜的结果证实，TiO2在HKT纳米片上成功装饰。 TiO 2和HKT的组合将TiO 2的吸收波长从UV扩展到可见光范围，并且还增强了光屏蔽电子孔对的分离效率。 60分钟照明后，rHB对HKT / TiO2-1.0的光催化降解速率几乎为97.9％，高于HKT和纯TiO2。光催化剂表现出优异的可重用性，即使在三个循环后，rhb的降解率为95.7％。光催化机制实验表明，中心点O-2（ - ）和H（+）在光催化过程中起显着作用。所有这些结果表明，新制造的HKT / TiO2复合材料提供了一种用于废水处理的高性能光催化剂，并且Thiostannate的应用可以扩展到光催化材料领域。

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  • 来源
    《RSC Advances》 |2020年第20期|共10页
  • 作者

    Wang Rongjing; Li Yaru; Sun Qianyi; Gao Kaihua; Pan Yufu; Li Meng; Zhang Feitian; Na Ping;

  • 作者单位

    Tianjin Univ Sch Chem Engn &

    Technol Tianjin 300354 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Tianjin 300354 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Tianjin 300354 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Tianjin 300354 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Tianjin 300354 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Tianjin 300354 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Tianjin 300354 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Tianjin 300354 Peoples R China;

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