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首页> 外文期刊>RSC Advances >One-step synthesis of band-tunable N, S co-doped commercial TiO2/graphene quantum dots composites with enhanced photocatalytic activity
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One-step synthesis of band-tunable N, S co-doped commercial TiO2/graphene quantum dots composites with enhanced photocatalytic activity

机译：带状可调谐N，S共掺杂的商用TiO 2 /石墨烯量子点复合材料的一步合成

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N, S co-doped commercial TiO2/N, S-GQDs graphene quantum dots (NSTG) composites with band tunability are synthesized via a facile solvothermal treatment in the presence of thiourea, which acts as a precursor for the dopants. The as prepared nanocomposites are characterized via X-ray diffraction (XRD), Raman spectroscopy (Raman), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform-infrared spectroscopy (FT-IR) and UV-vis diffuse reflectance spectroscopy (UV-vis DRS). The photocatalytic activity of NSTG is evaluated through the degradation of methylene blue (MB) under visible light irradiation (λ > 400 nm). Compared with commercial TiO2 (P25) and N, S co-doped TiO2 (NST), the NSTG composites exhibit the highest photodegradation efficiency. The apparent rate constant of NSTG is about 2.4 times and 50.7 times higher than that of NST and commercial TiO2, respectively. Furthermore, the band gaps of the NSTG composites can be tuned by changing the molar ratio of citric acid (CA)?:?thiourea. Our work demonstrates that this innovative synthetic approach could provide an effective approach for industrial applications due to its low cost and scalability. Furthermore, the NSTG composites are a more promising photocatalytic material than the well studied N doped TiO2 for potential applications in environmental protection.
机译：N，S共掺杂的TiO 2 / N，S，GQDs石墨烯量子点（NSTG）具有能带可调性的复合材料通过合成在硫脲的存在下进行轻松的溶剂热处理，硫脲充当掺杂剂的前体。所制备的纳米复合材料通过X射线衍射（XRD），拉曼光谱（Raman），扫描电子显微镜（SEM），透射电子显微镜（TEM），X射线光电子光谱（XPS）表征。 ，傅立叶变换红外光谱（FT-IR）和紫外可见漫反射光谱（UV-vis DRS）。 NSTG的光催化活性通过可见光（λ 2 （P25）和N，S共掺杂的TiO 2 （small）（NST）相比， NSTG复合材料表现出最高的光降解效率。 NSTG的表观速率常数分别比NST和市售的TiO 2 高2.4倍和50.7倍。此外，可以通过改变柠檬酸（CA）2与硫脲的摩尔比来调节NSTG复合材料的带隙。我们的工作表明，这种创新的合成方法由于其低成本和可扩展性，可以为工业应用提供有效的方法。此外，NSTG复合材料是一种较有希望的光催化材料，其在环保方面的潜在应用比经充分研究的N掺杂TiO 2 更为广泛。

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