The unmodified graphitic carbon nitride (g-C₃N₄) suffers from low photocatalytic activity because of the unfavourable structure. In the present work, we reported a simple self-structural modification strategy to optimize the microstructure of g-C₃N₄ and obtained graphene-like g-C₃N₄ nanosheets with porous structure. In contrast to traditional thermal pyrolysis preparation of g-C₃N₄, the present thermal condensation was improved via pyrolysis of thiourea in an alumina crucible without a cover, followed by secondary heat treatment. The popcorn-like formation and layer-by-layer thermal exfoliation of graphene-like porous g-C₃N₄ was proposed to explain the formation mechanism. The photocatalytic removal performance of both NO and NO₂ with the graphene-like porous g-C₃N₄ for was significantly enhanced by self-structural modification. Trapping experiments and in-situ diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) measurement were conducted to detect the active species during photocatalysis and the conversion pathway of g-C₃N₄ photocatalysis for NO_x purification was revealed. The photocatalytic activity of graphene-like porous g-C₃N₄ was highly enhanced due to the improved charge separation and increased oxidation capacity of the ∙O₂⁻ radicals and holes. This work could not only provide a novel self-structural modification for design of highly efficient photocatalysts, but also offer new insights into the mechanistic understanding of g-C₃N₄ photocatalysis.

未改性的石墨碳氮化物（gC ₃ N ₄）由于其不利的结构而具有低的光催化活性。在目前的工作中，我们报告了一种简单的自结构修饰策略，以优化gC ₃ N ₄的微观结构，并获得了具有多孔结构的石墨烯状gC ₃ N ₄纳米片。与传统的gC ₃ N _4的热裂解制备方法相比，本发明的热缩合反应是通过在无盖的氧化铝坩埚中通过硫脲的热解，随后进行二次热处理而得到改善的。石墨烯状多孔gC的爆米花状形成和逐层热剥落提出了₃ N ₄来解释其形成机理。通过自结构改性，石墨烯状多孔gC ₃ N ₄对NO和NO ₂的光催化去除性能显着提高。捕集实验和原位漫反射傅里叶变换红外光谱（DRIFTS）测量进行了光催化和GC的转化途径期间检测所述活性种₃ Ñ ₄光催化对NO _X的净化揭示。石墨烯状多孔gC ₃ N ₄的光催化活性由于被高度增强的改进的电荷分离，并增加了∙的O氧化能力₂ ^-基团和空穴。这项工作不仅可以为高效光催化剂的设计提供新颖的自我结构修饰，而且可以为gC ₃ N ₄光催化的机理理解提供新的见解。