Suffering from inefficient separation and transfer of photogenerated carriers, the deeply photocatalytic oxidation of NO-to-NO₃^– over g-C₃N₄ is still a daunting challenge. Well-designed heterojunction photocatalysts have been proven to be effective in steering charge transfer for achieving a particular migration path and more active sites, which hold huge promise in further performance stimulation. Herein, in-situ face-to-face hydrothermal approach is developed to prepare a multilayer heterostructure O doping g-C₃N₄ (O-g-C₃N₄) with W₁₈O₄₉ (O-g-C₃N₄@W₁₈O₄₉). The experimental and theoretical results show that the unique multilayer heterostructure can improve the separation efficiency of carriers by changing the electron migration path. Moreover, doping O atoms are identified as the newly formed active centers to largely facilitate the activation of NO. Impressively, the O-g-C₃N₄@W₁₈O₄₉ photocatalyst thus exhibits largely improved photocatalytic NO removal rate (56.7 %, 0.1 g of sample) and high selectivity of NO to NO₃^– (98.3 %). It outperforms the reported photocatalysts materials in visible light. This study not only provides a facile strategy for experimentally screening advanced photocatalytic materials, but also paves the way for the deep oxidation of NO.

由于光生载流子的分离和转移效率低下，NO-to-NO ₃ ^– over gC ₃ N ₄的深度光催化氧化仍然是一项艰巨的挑战。精心设计的异质结光催化剂已被证明可有效地控制电荷转移以实现特定的迁移路径和更多的活性位点，这在进一步的性能刺激方面具有巨大的前景。在此，开发了原位面对面水热法制备多层异质结构 O 掺杂 gC ₃ N ₄ (OgC ₃ N ₄ ) 与 W ₁₈ O ₄₉ (OgC ₃N ₄ @W ₁₈ O ₄₉）。实验和理论结果表明，独特的多层异质结构可以通过改变电子迁移路径来提高载流子的分离效率。此外，掺杂的 O 原子被确定为新形成的活性中心，可在很大程度上促进 NO 的活化。令人印象深刻的是，OgC ₃ N ₄ @W ₁₈ O ₄₉光催化剂因此表现出大大提高的光催化 NO 去除率（56.7%，0.1 g 样品）和 NO 对 NO _{3的高选择性}^–(98.3%)。它在可见光下的性能优于报道的光催化剂材料。该研究不仅为实验筛选先进的光催化材料提供了一种简便的策略，而且为NO的深度氧化铺平了道路。