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, N₂ adsorption-desorption, 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 microwave-assisted 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 NO_x gas removal efficiencies. The nanostructured TiO₂ samples prepared at a higher NaOH concentration have shown improved de-NO_x efficiencies than the TiO₂–P25 precursor.

TiO ₂纳米结构已通过微波水热法使用不同的NaOH浓度制备。使用紫外可见漫反射光谱，X射线光电子能谱，光致发光光谱，拉曼光谱，N ₂吸附-脱附和透射电子显微镜分析系统地研究了产品的理化性质。结果表明，NaOH浓度与微波辅助水热法得到的不同类型的纳米结构二氧化钛产物之间密切相关。在低NaOH浓度（4 M和6 M）下，前体TiO ₂纳米颗粒部分转化为一维（1D）纳米结构（例如，纳米棒或纳米线）和2D纳米结构（例如，纳米片）的混合物。随着NaOH浓度增加到8M和10M，获得的TiO ₂产物分别包含具有明显更大的比表面积的纳米片和纳米管状结构。合成的二氧化钛的光催化性能₂的产品，不同的NaOH浓度下制备的，是通过有毒NO评价_X气体去除效率。该纳米结构的TiO _2个在更高的氢氧化钠浓度制备的样品表现出改进的脱NO _X效率比的TiO ₂ -P25前体。