Tailoring defective conjugated heterocyclic network to make for broaden light absorption and efficient charge separation for photocatalytic application is an urgent assignment for graphitic carbon nitride (g-C₃N₄) materials. Here we report a ficile “one-pot” solvothermal method to synthesize controllable O-doped g-C₃N₄ catalysts at low temperature. By this template-free approach, hollow microsphere O-doped g-C₃N₄ products were obtained. Structure characterization reveals that the as-prepared sample has incomplete heptazine heterocyclic ring structure, and appears O doping in the lattice, which may derived from the activated O₂ molecular. With the extending condensation time, the increased heteroelement doping content and narrowed band gap promote the light harvesting and charge separation efficiency. Compared to pristine g-C₃N₄ prepared under high-temperature calcination, this novel material show remarkably photocatalytic activity for environment pollutant purification and splitting water for H₂ evolution, even though the conduction level decrease. This work highlights that the architecture and electronic properties of g-C₃N₄ based materials could be facile control through mild solvothermal route, which is a reference way for design and fabricate highly efficient non-metal photocatalyst with peculiar feature.

中文翻译：

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氧掺杂氮化碳空心微球的光催化合成

裁切有缺陷的共轭杂环网络以扩大光吸收范围和进行光催化应用的有效电荷分离是石墨氮化碳（gC ₃ N ₄）材料的紧迫任务。在这里，我们报告了一种简单的“一锅法”溶剂热方法，可在低温下合成可控制的O掺杂gC ₃ N ₄催化剂。通过这种无模板方法，获得了空心微球O掺杂的gC ₃ N ₄产物。结构表征表明，所制备的样品具有不完全的庚嗪杂环结构，并且在晶格中出现了O掺杂，这可能是由活化的O ₂衍生而来的。分子。随着凝结时间的延长，增加的杂元素掺杂含量和变窄的带隙促进了光​​收集和电荷分离效率。与在高温煅烧下制备的原始gC ₃ N ₄相比，即使传导水平降低，该新型材料仍具有显着的光催化活性，可净化环境污染物并分解水以释放H ₂。这项工作强调，可以通过温和的溶剂热途径轻松控制基于gC ₃ N ₄的材料的结构和电子性能，这是设计和制备具有特殊功能的高效非金属光催化剂的参考方法。