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An investigation into the solar light-driven enhanced photocatalytic properties of a graphene oxide-SnO2-TiO2 ternary nanocomposite

机译：石墨烯氧化物-SnO2-TiO2三元纳米复合材料的太阳能光驱动增强光催化性能研究

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A novel graphene oxide (GO)-SnO2-TiO2-based ternary nanocomposite was prepared via a one-step solvothermal process. The structure, morphology, and optical properties were characterized by a series of techniques, including X-Ray Diffraction (XRD), Field-Emission Scanning Electron Microscopy (FE-SEM), Energy Dispersive Spectroscopy (EDS), UV-vis Diffuse Reflectance Spectroscopy (DRS), Photoluminescence, Raman spectroscopy, Nitrogen Adsorption-Desorption, and X-Ray Photoelectron Spectroscopy (XPS). Various microscopic images of the ternary nanocomposite showed that the SnO2 and TiO2 nanoparticles are firmly covered over GO, thereby increasing the surface area of the resultant nanocomposite. The photocatalytic activity of ternary GO-SnO2-TiO2 and binary GO-SnO2 and GO-TiO2 materials were studied through the photodegradation of congo red and methylene blue under solar radiation. The degradation efficiency of GO-SnO2-TiO2 was found to be 96% for methylene blue dyes within 60 min and 98% for congo red within 70 min, which is much higher than the binary composites. Furthermore, a photoelectrochemical study was performed to provide further insight into the photocatalytic activity, which further confirmed the superiority of the novel ternary nanocomposite in photocurrent generation. The enhanced photocatalytic properties of the ternary nanocomposite can be attributed to enhanced light absorption, efficient charge transfer process, high surface area, as well as superior durability of the composite. In addition, a possible reaction mechanism has been postulated. Our results have demonstrated that by carefully introducing GO with suitable metal oxides, highly efficient photocatalysts can be designed that would absorb a wider range of the solar spectrum.
机译：通过一步的溶液方法制备一种新型石墨烯（GO）-SnO2-TiO 2的三元纳米复合材料。通过一系列技术，包括X射线衍射（XRD），现场排放扫描电子显微镜（Fe-SEM），能量分散光谱（EDS），UV-Vis弥射反射光谱（Fe-Vis弥射反射光谱）的结构，形貌和光学性质。 （DRS），光致发光，拉曼光谱，氮吸附 - 解吸和X射线光电子体光谱（XPS）。三元纳米复合材料的各种微观图像显示，SnO2和TiO2纳米颗粒牢固地覆盖，从而增加所得纳米复合材料的表面积。通过在太阳辐射下的刚果红和亚甲基蓝光降解研究了三元Go-SnO2-TiO2和二元Go-SnO2和Go-TiO2材料的光催化活性。发现Go-SnO2-TiO2的降解效率为60分钟内的亚甲基蓝染料为96％，70分钟内刚果红色98％，其远高于二元复合材料。此外，进行了光电化学研究以提供进一步了解光催化活性，这进一步证实了新型三元纳米复合材料在光电流中的优越性。三元纳米复合材料的增强的光催化性能可归因于增强的光吸收，高效电荷转移过程，高表面积以及复合材料的优异耐久性。此外，已经假设了可能的反应机制。我们的研究结果表明，通过用合适的金属氧化物仔细地引入，可以设计高效的光催化剂，这将吸收更广泛的太阳光谱。

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  • 来源
    《RSC Advances》 |2016年第38期|共15页
  • 作者

    Kumar Aniket; Rout Lipeeka; Achary L. Satish K.; Mohanty Anurag; Dhaka Rajendra S.; Dash Priyabrat;

  • 作者单位

    Natl Inst Technol Dept Chem Rourkela 769008 Odisha India;

    Natl Inst Technol Dept Chem Rourkela 769008 Odisha India;

    Natl Inst Technol Dept Chem Rourkela 769008 Odisha India;

    Natl Inst Technol Dept Chem Rourkela 769008 Odisha India;

    Indian Inst Technol Delhi Dept Phys Novel Mat &

    Interface Phys Lab Hauz Khas New Delhi 110016 India;

    Natl Inst Technol Dept Chem Rourkela 769008 Odisha India;

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