Li Si, Yang Yan, Wan Shipeng, Wang Ruonan, Yu Mingyi, Song Fujiao, Zhong Qin
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, PR China.
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, PR China; Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Republic of Korea.
J Colloid Interface Sci. 2023 Dec;651:726-733. doi: 10.1016/j.jcis.2023.08.042. Epub 2023 Aug 7.
Carbon nitride is an attractive non-metallic photocatalyst due to its small surface area, rapid electron-hole recombination, and low absorption of visible light. In this study, one-dimensional carbon nitride nanotubes were successfully synthesized by supramolecular self-assembly method for photocatalytic reduction of CO under mild conditions. The material demonstrates significantly improved CO-to-CO activity compared to bulk carbon nitride under visible light irradiation, with a rate of 12.58 μmol gh, which is 3.37 times higher than that of pristine carbon nitride. This enhanced activity can be attributed to the abundant oxygen defects and nitrogen vacancies in the unique tubular carbon nitride structure, which results in the generation of more active sites and the efficient acceleration of the migration of photogenerated electron-hole pairs. Various characterizations collectively support the presence of these defects and vacancies. Moreover, in situ DRIFTS spectroscopy supported the proposed reaction mechanism for the photoreduction of CO. This eco-friendly design approach provides novel insights into utilizing solar energy for the production of value-added products.
由于其表面积小、电子-空穴复合快以及对可见光的吸收低，氮化碳是一种有吸引力的非金属光催化剂。在本研究中，通过超分子自组装方法成功合成了一维氮化碳纳米管，用于在温和条件下光催化还原CO。与块状氮化碳相比，该材料在可见光照射下表现出显著提高的CO转化为CO的活性，速率为12.58 μmol g/h，比原始氮化碳高3.37倍。这种增强的活性可归因于独特管状氮化碳结构中丰富的氧缺陷和氮空位，这导致产生更多的活性位点并有效加速光生电子-空穴对的迁移。各种表征共同支持了这些缺陷和空位的存在。此外，原位漫反射红外傅里叶变换光谱法支持了所提出的CO光还原反应机理。这种环保的设计方法为利用太阳能生产增值产品提供了新的见解。
