In this paper, a series of isotype heterojunction photocatalysts with urea-derived g-C₃N₄ (CNU) as the core and cyanamide-derived g-C₃N₄ (CNC) as the shell are reported. A much thinner CNC shell which can protect the CNU core from thermal etching and determines the light absorption is beneficial to improve the photocarrier transfer and separation efficiency, pore volume, and the overall crystalline degree of the most active CNU/CNC2 core–shell isotype heterojunction photocatalyst for rhodamine B (RhB) degradation. Contrast experiments confirm that the electron-derived oxidant species (⋅O2−) play key roles in driving the RhB degradation.

中文翻译：

---

用于高效环境修复的少层g-C3N4衍生核壳同型异质结光催化剂

本文报道了一系列以尿素衍生的gC ₃ N ₄ (CNU)为核、单氰胺衍生的gC ₃ N ₄ (CNC)为壳的同型异质结光催化剂。更薄的CNC壳可以保护CNU核免受热蚀刻并决定光吸收，有利于提高最活跃的CNU/CNC2核-壳同型异质结的光载流子转移和分离效率、孔体积和整体结晶度用于罗丹明 B (RhB) 降解的光催化剂。对比实验证实，电子衍生的氧化剂物种（·O2-)在驱动 RhB 降解中起关键作用。