Abstract—X-ray diffraction, optical spectroscopy, and electron paramagnetic resonance (EPR) have been used to study microspheres and nanoheterostructures based on titanium dioxide synthesized by aerosol pyrolysis and sol–gel methods. All test samples are characterized by a large specific surface area (about 100 m²/g of substance). It was established that the main type of radicals in the resulting structures are N^•, NO^•, as well as Ti³⁺, Mo⁵⁺, V⁴⁺, and W⁵⁺ centers. Microspheres and nanoheterostructures consisting of several metal oxides have high photocatalytic activity in the visible spectrum and the ability to accumulate photogenerated charge carriers. As a result, catalytic reactions in the samples continue even after illumination is turned off. A correlation was found between the rate of photocatalysis and the radical concentration in the studied structures. The results can be used to develop new-generation energy-efficient catalytic devices based on nanocrystalline titanium oxide, which operate in the visible range and do not require continuous illumination.

中文翻译：

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基于二氧化钛的高光催化活性纳米材料

摘要— X射线衍射，光谱学和电子顺磁共振（EPR）已用于研究基于气溶胶热解和溶胶-凝胶法合成的二氧化钛的微球和纳米异质结构。所有测试样品都具有较大的比表面积（约100 m ² / g物质）。已经确定，所得结构中自由基的主要类型为N ^•，NO ^•以及Ti ³⁺，Mo ⁵⁺，V ⁴⁺和W ⁵⁺中心。由几种金属氧化物组成的微球和纳米异质结构在可见光谱中具有很高的光催化活性，并具有积累光生电荷载流子的能力。结果，即使关闭照明，样品中的催化反应仍在继续。在所研究的结构中发现了光催化速率与自由基浓度之间的相关性。该结果可用于开发基于纳米晶体氧化钛的新一代节能型催化装置，该装置可在可见光范围内工作，不需要连续照明。