A nitrogen-doped titanium dioxide–reduced graphene oxide (N-TiO₂–RGO) nanocomposite has been synthesized by the combination of a hydrothermal method and a thermal treatment under a NH₃/N₂ atmosphere. The resulting composites are characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, diffuse reflectance absorption spectroscopy, energy-dispersive X-ray spectroscopy, and Raman characterization techniques. The sequence of the thermal treatment and hydrothermal treatment processes is shown to influence the photocatalytic activity of nitrogen-doped composites. The composites synthesized by using this method show better photocatalytic activities toward the degradation of acetaldehyde under visible light irradiation compared with P25, N-TiO₂, and TiO₂–RGO. By applying the thermal treatment process after the hydrothermal process, nitrogen atoms can be simultaneously doped in the lattice of TiO₂ nanoparticles and on the surface of reduced graphene oxide sheets. The conversion of acetaldehyde, as the model molecule of volatile organic compounds, is measured in a continuous stirred-tank reactor until the steady state condition is reached. The conversion of 50 ppm acetaldehyde, in an air flow under illumination from an 80 W Hg lamp with a UV cut-off filter, reaches 62% after a 1-h reaction using a 0.07 g N-TiO₂–RGO sample with an optimum loading of 2 wt% graphene oxide. In comparison, the photocatalytic activity of P25 for the degradation of acetaldehyde under visible light irradiation is only 8% under the same reaction conditions. The reaction rates for acetaldehyde degradation are calculated and predicted with pseudo-first-order reaction kinetics, and the activity result of the best N-TiO₂–RGO sample is 12.3 times higher than for P25.

通过水热法和NH ₃ / N ₂热处理相结合的方法合成了氮掺杂的二氧化钛还原氧化石墨烯（N-TiO ₂ -RGO）纳米复合材料。气氛。所得复合材料通过傅里叶变换红外光谱，扫描电子显微镜，透射电子显微镜，漫反射吸收光谱，能量色散X射线光谱和拉曼表征技术进行表征。热处理和水热处理过程的顺序显示出会影响氮掺杂复合材料的光催化活性。与P25，N-TiO ₂和TiO ₂ -RGO相比，用这种方法合成的复合材料在可见光照射下对乙醛的降解表现出更好的光催化活性。通过在水热处理之后进行热处理工艺，可以将氮原子同时掺杂在TiO ₂的晶格中纳米颗粒和还原的氧化石墨烯片的表面上。在连续搅拌釜反应器中直至达到稳态条件为止，测量作为挥发性有机化合物模型分子的乙醛的转化率。使用0.07 g N-TiO ₂ -RGO样品（最佳反应条件），在1小时反应后，在具有UV截止滤光片的80 W Hg灯的照明下，空气中50 ppm乙醛的转化率达到62％。负载2重量％的氧化石墨烯。相比之下，在相同的反应条件下，P25在可见光照射下对乙醛降解的光催化活性仅为8％。用拟一级反应动力学计算和预测乙醛降解的反应速率，并得到最佳N-TiO的活性结果。_{2 –} RGO样本是P25的12.3倍。