Abstract Herein, the facile fabrication of a novel 3D macroporous structure of graphitic carbon nitride composed of self-assembled 2D nitrogen vacancy engineered nanosheets have been reported. The synthesis of the defect-engineered structure was achieved upon the addition of ethylene glycol during the solid-state synthesis process. The photocatalyst was characterized through a wide range of characterization techniques. The macroporous structure exhibited superior photocatalytic efficiency towards tetracycline antibiotic degradation under LED light illumination. The defect-engineered material (4EGCN) exhibited a 3.3-fold superior degradation rate coefficient of 0.010 min−1, compared to the degradation rate coefficient (0.003 min−1) of the bulk counterpart. This superior photocatalytic performance could be accredited to the extended visible light extraction efficiency, increased suppression efficacy of charge carriers, and porous structure. Moreover, the photocatalyst showed excellent stability even after five cycles of photocatalytic tetracycline degradation. Further, a probable degradation mechanism has been proposed according to the observations of the radical scavenging experiments.

中文翻译：

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用于在 LED 光照射下降解四环素的自组装缺陷工程超薄 g-C3N4 纳米片的 3D 大孔结构

摘要本文报道了一种由自组装 2D 氮空位工程纳米片组成的新型石墨氮化碳 3D 大孔结构的简便制造。在固态合成过程中通过加入乙二醇实现了缺陷工程结构的合成。光催化剂通过广泛的表征技术进行表征。在 LED 光照射下，大孔结构对四环素抗生素降解表现出优异的光催化效率。与本体对应物的降解速率系数 (0.003 min-1) 相比，缺陷工程材料 (4EGCN) 表现出 3.3 倍的优异降解速率系数 0.010 min-1。这种卓越的光催化性能可以归因于扩展的可见光提取效率、提高的载流子抑制效率和多孔结构。此外，即使经过五次光催化四环素降解循环后，该光催化剂仍表现出优异的稳定性。此外，根据自由基清除实验的观察，提出了可能的降解机制。