Materials Institute of Atomic and Molecular Science, Shaanxi University of Science and Technology, Xi'an 710021, China.
Materials Institute of Atomic and Molecular Science, Shaanxi University of Science and Technology, Xi'an 710021, China; School of Materials Science & Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
J Colloid Interface Sci. 2021 Oct 15;600:639-648. doi: 10.1016/j.jcis.2021.05.075. Epub 2021 May 18.
B atoms and cyano groups co-doped graphite carbon nitride with nitrogen vacancies (VN-BC-CN) was explored via one-step in-situ route. A series of comprehensive experiments confirmed that B atoms and cyano groups had been doped into the framework of graphite carbon nitride, forming VN-BC-CN catalyst sample with a large number of nitrogen-vacancy defects. As electron acceptors, B and cyano groups could be used as active sites for nitrogen conversion. The defect level caused by nitrogen vacancy led to red shift of the light absorption edge, which resulted in higher separation efficiency of photo-induced carriers and faster transfer rate of photo-induced electrons for the VN-BC-CN catalyst. This VN-BC-CN catalyst had good photocatalytic nitrogen fixation performance in the ultrapure water without any hole-scavengers. The nitrogen photofixation rate of VN-BC-CN (115.53 μmol g h) was 25.5 times that of pure carbon nitride (GCN, 4.53 μmol g h). Moreover, NH generation rate hardly decreased after 10 h reaction, and the NH generation rate could reach 79.56 μmol g h in the fifth cycle, showing the good photocatalytic stability of the VN-BC-CN catalyst.
通过一步原位法探索了具有氮空位的 B 原子和氰基共掺杂石墨相氮化碳(VN-BC-CN)。一系列综合实验证实，B 原子和氰基已被掺杂到石墨相氮化碳的骨架中，形成具有大量氮空位缺陷的 VN-BC-CN 催化剂样品。作为电子受体，B 和氰基基团可以用作氮转化的活性位点。氮空位引起的缺陷能级导致光吸收边缘红移，从而导致光生载流子的分离效率更高，光生电子的转移速率更快，VN-BC-CN 催化剂具有良好的光催化固氮性能，在没有任何空穴捕获剂的超纯水中。VN-BC-CN（115.53 μmol g h）的氮光固定速率是纯氮化碳（GCN，4.53 μmol g h）的 25.5 倍。此外，反应 10 h 后 NH 生成速率几乎没有下降，第五个循环中 NH 生成速率可达 79.56 μmol g h，表明 VN-BC-CN 催化剂具有良好的光催化稳定性。
