Li Ziyang, Sun Mingxuan, Chen Haohao, Zhao Junjie, Huang Xiangzhi, Gao Yu, Teng Huanying, Chen Chen
School of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, P. R. China.
Dalton Trans. 2024 Jun 10;53(23):9750-9762. doi: 10.1039/d4dt01031k.
Herein, a series of N-doped TiC/porous g-CN composites are ultrasonically prepared from N-doped TiC and porous g-CN under N 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, . Moreover, photocatalytic measurements show that N-doped TiC is an excellent modifier for porous g-CN to heighten its photocatalytic activity. Only 44.1% of rhodamine B can be degraded by the photocatalysis of pristine porous g-CN, while the photocatalytic degradation ratio of rhodamine B can reach up to 97.5% for the optimal N-doped TiC loading composites under visible light for 15 min. Moreover, the photocatalytic tests of N fixation confirm that the optimal composites show the highest production yield of NH (11.8 μmol g h), which is 2.11-folds more than that of porous g-CN (5.6 μmol g h). 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-CN with N-doped TiC.
在此，在氮气气氛下，通过超声处理由氮掺杂的TiC和多孔g-CN制备了一系列氮掺杂的TiC/多孔g-CN复合材料。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-可见漫反射光谱对所制备复合材料的结构、形貌和光学特性进行了表征。此外，光催化测量表明，氮掺杂的TiC是多孔g-CN的优良改性剂，可提高其光催化活性。原始多孔g-CN的光催化作用仅能降解44.1%的罗丹明B，而在可见光下照射15分钟时，对于最佳氮掺杂TiC负载量的复合材料，罗丹明B的光催化降解率可达97.5%。此外，固氮的光催化测试证实，最佳复合材料显示出最高的NH₃产率（11.8 μmol g⁻¹ h⁻¹），这是多孔g-CN（5.6 μmol g⁻¹ h⁻¹）的2.11倍。增强的光催化性能得益于更多的光生电子和空穴的分离、更高的光响应能力以及更丰富的活性位点。这项工作开辟了通过氮掺杂的TiC提高多孔g-CN光催化性能的途径。
