Herein, a series of N-TiO₂/Ti₃C₂ (N-TTC_x) composites are constructed via ultrasonically treating pre-synthesized N doped TiO₂ and Ti₃C₂ at room temperature. The intimate contact between N-TiO₂ and Ti₃C₂ is verified by the transmission electron microscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy. And, the N-TTC_0.06 composites exhibit the best sonophotocatalytic performance, which is 1.9 times and 8.8 folds higher than that of TiO₂ for pollutant degradation and nitrogen fixation, respectively. What’s more, sonophotocatalytic degradation of pollutants and nitrogen fixation shows larger efficiency compared with that of photocatalysis and sonocatalysis, which is attributed to the synergistic effect between sonocatalysis and photocatalysis in the sonophotocatalytic process. Moreover, taking N-TTC_0.06 for example, the three cycles of sonophotocatalytic degradation of Rh-B and nitrogen fixation as well as the unchanged X-ray diffraction before and after sonophotocatalytic nitrogen fixation all confirm the stable sonophotocatalytic behavior of N-TiO₂/Ti₃C₂ composites. The improved sonophotocatalytic activity is attributed to the decrease of band gap by N 2p doping level and the separation/transfer improvement of photoinduced carriers by Ti₃C₂, which are demonstrated by UV–vis absorption spectra, photoelectrochemical tests, Nyquists plots, and Mott-schottky plots. This study confirms that the designed N-TiO₂/Ti₃C₂ composites exhibit great potential application in sonophotocatalytic pollutant degradation and nitrogen fixation.

在此，一系列N-TiO ₂ /Ti ₃ C ₂ (N-TTC _x )复合材料通过在室温下超声处理预先合成的N掺杂TiO ₂和Ti ₃ C ₂来构建。N-TiO ₂和Ti ₃ C ₂之间的密切接触由透射电子显微镜、扫描电子显微镜和X射线光电子能谱证实。并且，N-TTC _0.06复合材料表现出最好的声光催化性能，是 TiO _{2 的}1.9 倍和 8.8 倍分别用于污染物降解和固氮。此外，与光催化和声催化相比，声光催化降解污染物和固氮显示出更高的效率，这归因于声光催化过程中声催化和光催化之间的协同作用。此外，以N-TTC _0.06为例，Rh-B的声光催化降解和固氮的三个循环以及声光催化固氮前后的X射线衍射均未发生变化，均证实了N-TiO ₂ /钛₃ C ₂复合材料。改进的声光催化活性归因于 N 2p 掺杂水平导致的带隙减小和 Ti ₃ C ₂对光诱导载流子的分离/转移的改进，这可以通过紫外-可见吸收光谱、光电化学测试、奈奎斯特图和莫特图来证明-肖特基图。该研究证实，所设计的N-TiO ₂ /Ti ₃ C ₂复合材料在声光催化污染物降解和固氮方面具有巨大的应用潜力。