Herein, a series of N-doped Ti₃C₂/porous g-C₃N₄ composites are ultrasonically prepared from N-doped Ti₃C₂ and porous g-C₃N₄ under N₂ atmosphere. The structure, morphology, and optical characteristics of the as-prepared composites are characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectroscopy, etc. Moreover, photocatalytic measurements show that N-doped Ti₃C₂ is an excellent modifier for porous g-C₃N₄ to heighten its photocatalytic activity. Only 44.1% of rhodamine B can be degraded by the photocatalysis of pristine porous g-C₃N₄, while the photocatalytic degradation ratio of rhodamine B can reach up to 97.5% for the optimal N-doped Ti₃C₂ loading composites under visible light for 15 min. Moreover, the photocatalytic tests of N₂ fixation confirm that the optimal composites show the highest production yield of NH₄⁺ (11.8 μmol g_cat⁻¹ h⁻¹), which is 2.11-folds more than that of porous g-C₃N₄ (5.6 μmol g_cat⁻¹ h⁻¹). The reinforced photocatalytic properties are revealed to profit from the more photogenerated electrons and holes’ separation, higher ability for light response, and more abundant active sites. This work develops the route for boosting the photocatalytic properties of porous g-C₃N₄ with N-doped Ti₃C₂.

中文翻译：

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N掺杂Ti3C2增强多孔g-C3N4用于光催化污染物降解和氮还原


本文以N掺杂为原料，采用超声法制备了一系列N掺杂Ti ₃ C ₂ /多孔g-C ₃ N ₄ 复合材料。 N ₂ 气氛下的 Ti ₃ C ₂ 和多孔 g-C ₃ N ₄ 。通过X射线衍射、透射电子显微镜、扫描电子显微镜、X射线光电子能谱、紫外-可见漫反射光谱等对所制备的复合材料的结构、形貌和光学特性进行了表征。此外，光催化测量表明表明N掺杂Ti ₃ C ₂ 是多孔g-C ₃ N ₄ 的优异改性剂，可提高其光催化活性。原始多孔g-C ₃ N ₄ 光催化只能降解44.1%的罗丹明B，而在最佳N条件下，罗丹明B的光催化降解率可达97.5%掺杂 Ti ₃ C ₂ 在可见光下负载复合材料 15 分钟。此外，N ₂ 固定的光催化测试证实，最佳复合材料显示出最高的 NH ₄ ⁺ 产率（11.8 μmol g _cat h ⁻¹ )，比多孔 g-C ₃ N ₄ (5.6 μmol g < b25> ⁻¹ h ⁻¹ ）。研究表明，增强的光催化性能得益于更多的光生电子和空穴分离、更高的光响应能力和更丰富的活性位点。这项工作开发了用N掺杂Ti ₃ C ₂ 提高多孔g-C ₃ N ₄ 光催化性能的途径。