Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 9808578, Japan.
Nanotechnology. 2020 Mar 13;31(11):114001. doi: 10.1088/1361-6528/ab59f6. Epub 2019 Nov 21.
The bulk graphitic carbon nitride (CN) suffers from low specific surface area, which limits its practical application for air purification. Here, we reported a facile post-thermal treatment to break bulk CN into nanosheets whose specific surface areas increased from 13.6 m g to 68.0 m g. The yield of CN nanosheets reached up to 67%, and its photocatalytic decomposition of NO activity was about 3.0 times higher than that of bulk CN. Moreover, the CN nanosheets obtained at 550 °C with higher specific surface area (113.9 m g) displayed lower photocatalytic activity than that obtained at 500 °C with lower specific surface area (68.0 m g), which was attributed to its lower valence band. This study illustrates that many factors including specific surface area and band structure could affect the performance of photocatalysts so that it is necessary to take account of various factors. Moreover, the facile and high yield thermal treatment provides the foundation for further large-scale industrial applications.
块状石墨相氮化碳（CN）比表面积低，限制了其在空气净化方面的实际应用。在这里，我们报道了一种简便的后热处理方法，将块状 CN 破碎成纳米片，其比表面积从 13.6 m²/g 增加到 68.0 m²/g。CN 纳米片的产率高达 67%，其光催化分解 NO 的活性约为块状 CN 的 3.0 倍。此外，在 550°C 下获得的具有更高比表面积（113.9 m²/g）的 CN 纳米片的光催化活性低于在 500°C 下获得的比表面积较低（68.0 m²/g）的 CN 纳米片，这归因于其较低的价带。本研究表明，包括比表面积和能带结构在内的许多因素都会影响光催化剂的性能，因此有必要考虑到各种因素。此外，简便且高产率的热处理为进一步的大规模工业应用提供了基础。
