By heating g-C₃N₄ powder in the hydrogen atmosphere, nitrogen defects were introduced into the framework of g-C₃N₄ where the nitrogen atoms in g-C₃N₄ were reacted and partially removed with hydrogen. The effects of nitrogen defects on the electronic structure, optical properties, generation of reactive oxygen species and photocatalytic NO oxidation of g-C₃N₄ were investigated by combining experimental characterization and DFT theoretical calculations. The N defect is located at N_2C sites and can be tuned by the H₂ treating temperature. The obtained N defective g-C₃N₄ products possessed narrower bandgap adjusted by surface N defects and were able to promote the separation of photoexcited charge carries and produce reactive oxygen species more efficiently than pristine g-C₃N₄. The NO⁺ reaction intermediate was formed on the N defects sites and enabled an accelerated photocatalytic reaction that contributed to enhanced photocatalytic NO removal. The NO removal ratio on N defects g-C₃N₄ obtained at 600 °C (CH-H-600) was 2.6 times that of pristine g-C₃N₄ under visible light irradiation. The present work could provide new insights into the understanding of the role of N-defects in g-C₃N₄ and application of photocatalytic technology for efficient air purification.

通过加热GC ₃ Ñ ₄中的氢气氛粉末，氮缺陷引入的GC的框架₃ Ñ ₄其中GC的氮原子₃ Ñ ₄进行反应，并用氢气部分地去除。结合实验表征和DFT理论计算，研究了氮缺陷对gC ₃ N ₄的电子结构，光学性质，活性氧的生成和光催化NO氧化的影响。N缺陷位于N _2C位置，可以通过H ₂处理温度进行调整。得到的N缺陷gC ₃N ₄产物具有通过表面N缺陷调节的较窄的带隙，并且能够比原始gC ₃ N ₄促进光激发电荷载流子的分离并更有效地产生活性氧。NO ⁺反应中间体在N个缺陷位点上形成，并能够促进光催化反应，从而促进了光催化NO的去除。在可见光照射下，在600°C（CH-H-600）下获得的N缺陷gC ₃ N ₄的NO去除率是原始gC ₃ N _4的2.6倍。目前的工作可以为理解N缺陷在gC中的作用提供新的见解。₃ N ₄和光催化技术在高效空气净化中的应用。