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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Synergistic Effect in Photocatalysis As Observed for Mixed-Phase Nanocrystalline Titania Processed via Sol-Gel Solvent Mixing and Calcination
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Synergistic Effect in Photocatalysis As Observed for Mixed-Phase Nanocrystalline Titania Processed via Sol-Gel Solvent Mixing and Calcination

机译：通过溶胶-凝胶溶剂混合和煅烧处理的混合相纳米晶二氧化钛在光催化中的协同效应。

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Mixed-phase nanocrystalline titania (T1O2) with varying rutile content has been synthesized via solvent mixing and calcination (SMC) treatment of sol—gel-derived nanocrystalline anatase-TiO2 and rutile-TiO2 precursors. The mixed-phase nanocrystalline TiO2 processed via sol—gel SMC has been characterized using X-ray diffraction, the scanning electron microscope, high-resolution transmission electron microscope, and ultraviolet—visible (UV—vis) diffuse reflectance spectroscope for analyzing its morphology, phase contents, nanocrystallite size distribution, and band gap. The photocatalytic activity of mixed-phase nanocrystalline TiO2 processed via sol—gel SMC is measured by monitoring the degradation of the methylene blue dye in an aqueous solution, under the UV-radiation exposure, using the UV—vis absorption spectroscope. It is demonstrated that the photocatalytic activity of mixed-phase nanocrystalline TiO2 processed via sol—gel SMC is a function of rutile content with the maximum photocatalytic activity observed for 40 wt% rutile. Thus, the synergistic effect has been observed between anatase-TiO2 and rutile-TiO2, which has been satisfactorily explained using a new model based on the band-gap variation in the connected nanocrystallites as a function of the size distribution and the phases involved, which overcomes the limitations of the existing models proposed earlier in the literature.
机译：通过溶剂混合和煅烧（SMC）处理溶胶-凝胶衍生的纳米晶锐钛矿型TiO2和金红石型TiO2前驱体，已经合成了具有不同金红石含量的混合相纳米晶二氧化钛（TiO2）。通过X射线衍射，扫描电子显微镜，高分辨率透射电子显微镜和紫外可见（UV-vis）漫反射光谱仪对通过溶胶-凝胶SMC处理的混合相纳米TiO2进行了表征，以分析其形态，相含量，纳米微晶尺寸分布和带隙。通过溶胶-凝胶SMC处理的混合相纳米晶TiO2的光催化活性是通过使用UV-vis吸收光谱仪在UV辐射照射下监测水溶液中亚甲基蓝染料的降解来测量的。结果表明，通过溶胶-凝胶SMC处理的混合相纳米晶TiO2的光催化活性是金红石含量的函数，对40 wt％的金红石具有最大的光催化活性。因此，在锐钛矿型TiO2和金红石型TiO2之间观察到了协同作用，已使用基于连接的纳米晶体的带隙变化作为尺寸分布和所涉及相的函数的新模型来令人满意地解释了这一点。克服了文献中较早提出的现有模型的局限性。

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