In this study, the porous ultrathin graphitic carbon nitride (CN) nanosheets with rich C and nitrogen defects were prepared by one-step calcining the mixture of melamine and glucose (Glu) in air atmosphere (Glu-CN). Introducing simultaneously rich C atoms and nitrogen defects into CN structures continuously modulates the bandgaps from 2.67 to 1.81 eV of CN photocatalysts. Due to large surface area, more active sites, remarkably longer lifetime of charge carriers and adjustable band gap structure, the prepared ultrathin porous CN nanosheets show the enhanced photocatalytic performance for the degradation of methyl orange (MO) under visible light. The degradation efficiency of optimal CN nanosheet photocatalyst for MO is 5.75 times that of bulk CN. This work provides a facile and universal relevance approach to engineer the band structures of CN by introduction of rich C and porous morphology for high-performance photocatalytic, which can provide informative principles for the design of efficient photocatalysis systems for solar energy conversion.

Graphic Abstract

中文翻译：

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通过将富碳原子限制在石墨碳氮化物结构上来提高催化性能

在这项研究中，通过在空气气氛（Glu-CN）中一步煅烧三聚氰胺和葡萄糖（Glu）的混合物，制备了具有富C和氮缺陷的多孔超薄石墨氮化碳（CN）纳米片。同时将富碳原子和氮缺陷引入 CN 结构连续调节 CN 光催化剂的带隙从 2.67 到 1.81 eV。由于大的表面积、更多的活性位点、显着更长的电荷载流子寿命和可调节的带隙结构，制备的超薄多孔 CN 纳米片在可见光下对甲基橙 (MO) 的降解表现出增强的光催化性能。最佳 CN 纳米片光催化剂对 MO 的降解效率是本体 CN 的 5.75 倍。

图形摘要