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首页> 外文期刊>Optical Materials >Physicochemical properties and photocatalytic de-NO_x performance of TiO_2 nanostructures via microwave hydrothermal strategy
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Physicochemical properties and photocatalytic de-NO_x performance of TiO_2 nanostructures via microwave hydrothermal strategy

机译：微波水热策略TiO_2纳米结构的物理化学特性和光催化DE_X性能

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摘要

TiO2 nanostructures have been prepared via microwave hydrothermal process using different NaOH concentrations. The physicochemical properties of the products were systematically investigated by using UV-vis Diffuse Reflectance Spectra, X-ray Photoelectron Spectra, Photoluminescence Spectra, Raman, N-2 adsorptiondesorption, and Transmission Electron Microscope analysis. The results indicated a close correlation between the NaOH concentration and different types of nanostructured titania products obtained from the microwaveassisted hydrothermal process. At low NaOH concentrations (4 M and 6 M), the precursor TiO2 nanoparticles partially converted into a mixture of one dimensional (1D) nanostructures (e.g., nanorods or nanowires) and 2D nanostructures such as nanosheets. As the NaOH concentration is increased to 8 M and 10 M, the obtained TiO2 products contain nanosheet and nanotube-like structures, respectively, with a significantly larger specific surface area. The photocatalytic performance of the synthesized TiO2 products, prepared under different NaOH concentrations, were evaluated through the toxic NOx gas removal efficiencies. The nanostructured TiO2 samples prepared at a higher NaOH concentration have shown improved de-NOx efficiencies than the TiO2-P25 precursor.
机译：使用不同的NaOH浓度通过微波水热法制备TiO2纳米结构。通过使用UV-VI扩散反射谱，X射线光电子体光谱，光致发光光谱，拉曼，N-2吸附剂和透射电子显微镜分析来系统地研究了产品的物理化学性质。结果表明，NaOH浓度和不同类型的纳米结构二氧化钛产品之间的密切相关性从微波缺失的水热过程中获得的。在低NaOH浓度（4M和6μm），前体TiO2纳米颗粒部分转化为一维（1D）纳米结构（例如，纳米码或纳米线）和2D纳米结构的混合物，例如纳米晶片。当NaOH浓度增加到8米和10μm时，所获得的TiO 2产品分别含有纳米晶片和纳米管状结构，具有明显较大的比表面积。通过毒性NOx气体去除效率评估在不同NaOH浓度下制备的合成TiO2产品的光催化性能。在较高的NaOH浓度下制备的纳米结构TiO 2样品显示出比TiO 2-P25前体的改善的脱脂效率。

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