Abstract

We consider the influence of the composition based on the nitrogen-doped titanium dioxide of a composite photocatalyst for hydrothermal synthesis on the structure adopted by the orthorhombic bismuth tungstate supported by titanium dioxide nanocrystallites. The structural features, composition, surface conditions, optical and electrochemical characteristics of the samples are studied by X-ray diffraction, X-ray photoelectron spectroscopy, nitrogen porosimetry, UV-Vis spectroscopy of diffuse surface reflections and subsequent Tauc analysis, electrochemical recording of photocurrent characteristics, and by registering the Nyquist diagrams. Catalytic tests in the test reaction of benzene vapor oxidation on synthesized photocatalysts are conducted in a flow-type reactor at the initial benzene concentrations of 2 µmol/L, 5 µmol/L, 10 µmol/L and the temperature of 40 °C under ultraviolet and blue light from LED optical radiation sources. The photocatalytic activity of the samples is estimated by the stationary steady-state rate of CO₂ (final product of benzene vapor oxidation) accumulation. Based on the obtained data, the structure of the phases in the synthesized catalysts are determined and the boundaries beyond which the formation of the bismuth tungstate phase proceeds with features that affect the structure of the resulting composite and its photocatalytic activity are determined.

中文翻译：

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Bi2WO6/TiO2-N复合材料的结构特征及其与苯蒸气光氧化催化性能的关系

摘要

我们考虑了用于水热合成的复合光催化剂的基于氮掺杂二氧化钛的组成对二氧化钛纳米微晶负载的正交钨酸铋所采用的结构的影响。通过X射线衍射、X射线光电子能谱、氮孔隙度测定、漫表面反射紫外-可见光谱以及随后的Tauc分析、光电流电化学记录研究了样品的结构特征、成分、表面状况、光学和电化学特性特性，并通过注册奈奎斯特图。在流通式反应器中，在紫外光下，初始苯浓度为2 µmol/L、5 µmol/L、10 µmol/L，温度为40 ℃下，进行了合成光催化剂苯蒸汽氧化试验反应的催化试验。以及来自 LED 光学辐射源的蓝光。_{样品的光催化活性通过CO 2} （苯蒸气氧化的最终产物）积累的稳态速率来估计。根据获得的数据，确定了合成催化剂中的相结构，并确定了钨酸铋相形成的边界，并确定了影响所得复合材料结构及其光催化活性的特征。