结构空位缺陷修饰双原子层g-C3N4纳米片增强光催化性能的制备,Advanced Science

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结构空位缺陷修饰双原子层g-C3N4纳米片增强光催化性能的制备
Advanced Science ( IF 14.3 ) Pub Date : 2023-06-21 , DOI: 10.1002/advs.202302503
Tian Liu ₁ , Wei Zhu ₁ , Ning Wang ₁ , Keyu Zhang ₁ , Xue Wen ₂ , Yan Xing ₃ , Yunfeng Li ₁

Affiliation

_{石墨碳氮化物（gC 3} N ₄）无需其他物质辅助的结构自改性引起了人们的广泛关注。在这项研究中，结构空位缺陷修饰的双原子层状gC ₃ N ₄纳米片（VCN）是通过在真空气氛的石英管中热处理块状gC ₃ N _{4来合成的，该热处理会产生压力-热双驱动力以提高gC}₃ N ₄的剥离和结构空位的形成。所制备的VCN具有较大的比表面积和丰富的孔结构，可为催化反应提供更多的活性中心。此外，VCN样品中形成的特殊缺陷能级可以在光激发阶段产生更高的激子密度。同时，由于对应于两个石墨氮化碳原子层的超薄结构（约1.5 nm）大大缩短了传输路径，光生电荷将快速转移到VCN表面。此外，缺陷能级还缓解了纳米级gC ₃ N ₄的量子尺寸效应导致带隙增大的缺点，从而具有良好的可见光利用率。因此，VCN样品在产氢和典型抗生素的光降解方面都表现出优异的光催化性能。

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Preparation of Structure Vacancy Defect Modified Diatomic-Layered g-C3N4 Nanosheet with Enhanced Photocatalytic Performance

Structure self-modification of graphitic carbon nitride (g-C₃N₄) without the assistance of other species has attracted considerable attention. In this study, the structure vacancy defect modified diatomic-layered g-C₃N₄ nanosheet (VCN) is synthesized by thermal treatment of bulk g-C₃N₄ in a quartz tube with vacuum atmosphere that will generate a pressure-thermal dual driving force to boost the exfoliation and formation of structure vacancy for g-C₃N₄. The as-prepared VCN possesses a large specific surface area with a rich pore structure to provide more active centers for catalytic reactions. Furthermore, the as-formed special defect level in VCN sample can generate a higher exciton density at photoexcitation stage. Meanwhile, the photogenerated charges will rapidly transfer to VCN surface due to the greatly shortened transfer path resulting from the ultrathin structure (≈1.5 nm), which corresponds to two graphite carbon nitride atomic layers. In addition, the defect level alleviates the drawback of enlarged bandgap caused by the quantum size effect of nano-scaled g-C₃N₄, resulting in a well visible-light utilization. As a result, the VCN sample exhibits an excellent photocatalytic performance both in hydrogen production and photodegradation of typical antibiotics.

更新日期：2023-06-21

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