In this study, sol–gel combining with hydrothermal methods were successfully used to synthesize N and S co-doped TiO₂ nanotubes (N@S-TiO₂ NTT) for efficient photocatalytic degradation of volatile organic compounds (VOCs). The obtained characterization results indicated that the synthesized N@S co-doped TiO₂ existed as nanotubes. Specific surface areas of these synthesized nanotubes was greatly that of these nanoparticles. The largest surface area recorded at N@S-TiO₂ nanotubes was 105.3 m³/g. FTIR spectrum results showed that the presence of N–H and S–O bond, which confirmed that nitrogen and sulfur were successfully doped into TiO₂ lattice. We also investigated that N@S dopants significantly improved the photocatalytic activity of TiO₂ nanotubes for efficient degradation of gaseous VOCs. Therefore, photocatalytic activity for VOCs degradation by the N@S-TiO₂ nanotubes was greater than that by the undoped TiO₂ nanotube. Optimized humidity for degradation of VOCs was medium condition (55–70%). Under dry conditions, lack of water for hydroxyl radical production led to decrease in photocatalytic activity. Under humidity conditions, the excess water molecules competed with VOCs for adsorbing on material surface leading to decrease in photocatalytic degradation efficiency. Under the optimized humidity, the highest photocatalytic efficiency of the synthesized N@S-TiO₂ nanotubes for degradation of gaseous VOCs for 3 h was approximately 94%. The VOCs degradation capacity by the synthesized N@S-TiO₂ nanotubes was approximately 90 (ppm/g h).

在这项研究中，溶胶-凝胶结合水热方法成功地用于合成N和S共掺杂的TiO ₂纳米管（N @ S-TiO ₂ NTT），以有效地光催化降解挥发性有机化合物（VOC）。表征结果表明，合成的N @ S共掺杂TiO ₂以纳米管的形式存在。这些合成的纳米管的比表面积在很大程度上是这些纳米粒子的比表面积。在N @ S-TiO ₂纳米管处记录的最大表面积为105.3m ³ / g。FTIR光谱结果表明存在N–H和S–O键，这表明氮和硫已成功掺杂到TiO _2中格子。我们还研究了N @ S掺杂剂显着提高了TiO ₂纳米管对光催化气态VOC的有效降解的光催化活性。因此，N @ S-TiO ₂纳米管对VOCs降解的光催化活性大于未掺杂的TiO ₂纳米管。挥发性有机化合物降解的最佳湿度是中等条件（55-70％）。在干燥条件下，缺乏用于产生羟基自由基的水导致光催化活性降低。在湿度条件下，过量的水分子与VOC竞争，吸附在材料表面，导致光催化降解效率降低。在最佳湿度下，合成的N @ S-TiO _2的光催化效率最高用于气态VOC降解3小时的纳米管约为94％。合成的N @ S-TiO ₂纳米管对VOCs的降解能力约为90（ppm / gh）。