A series of potassium-modified carbon nitrides (K-CNs) were prepared by KCl/LiCl molten-salt method, showing enhanced catalytic activity, optical absorption, and improved electron-hole separation than the corresponding carbon nitride (g-C₃N₄). The synthesized K-CN as a heterogeneous photocatalyst shows excellent catalytic performances in hydroxyalkylation of quinoxalin-2(1H)-ones under visible light irradiation in the air at room temperature. This is the first environmentally friendly visible-light-driven strategy for the activation of the α-C-H bond of alcohols to react with quinoxalin-2(1H)-ones under mild conditions.

采用 KCl/LiCl 熔盐法制备了一系列钾改性氮化碳 (K-CNs)，与相应的氮化碳 (gC ₃ N ₄ ) 相比，其催化活性、光吸收和电子-空穴分离均有所提高。合成的 K-CN 作为多相光催化剂，在室温下可见光照射下，在quinoxalin-2( 1H )-ones 的羟烷基化反应中表现出优异的催化性能。这是第一个环境友好的可见光驱动策略，用于在温和条件下激活醇的 α-CH 键以与 quinoxalin-2(1 H )-ones 反应。