Li Xue, Wu Qin, Hussain Mushraf, Chen Liang, Huang Qiong, Huang Wei, Tao Tao
School of Chemistry and Materials Science, Institute of Advanced Materials and Flexible Electronics, Nanjing University of Information Science and Technology (NUIST) Nanjing 210044 P. R. China
Jiangsu Collaborative Innovation Centre of Atmospheric Environment and Equipment Technologies, Jiangsu Key Laboratory of Atmospheric Environmental Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology Nanjing 210044 P. R. China.
RSC Adv. 2022 May 20;12(24):15378-15384. doi: 10.1039/d2ra02441a. eCollection 2022 May 17.
g-CN is a classic photocatalyst not only owing to the metal-free semiconducting electronic structure but also tunable multifunctional properties. However, strategies for chemical exfoliation of g-CN based on organic bases have been rarely reported. A family of sodium alkoxide-mediated g-CN has been prepared a simple synthesis. The degradation rate of bulk g-CN is 39.8% when irradiation lasts 140 minutes. However, the degradation rate of g-CN-MeONa, g-CN-EtONa, and g-CN- BuONa is 55.1%, 68.6%, and 79.1%, respectively, under the same conditions. Furthermore, g-CN- BuONa has been immobilized on flexible electrospun PAN nanofibers to prepare floating photocatalysts. SEM analysis shows that the paper-based photocatalyst PAN/g-CN- BuONa becomes a nanofiber membrane (A4 size, 210 mm × 297 mm). The nanofiber is approximately 350 nm in diameter. Interestingly, once synthesized, the g-CN- BuONa particles move into the spinning solution, where the nanofiber wraps around them to form a monodisperse structure that resembles beads, or knots of 1-2 μm, on a string. The degradation efficiency of 10 mg L MB solution can reach 100% for 2 hours until the solution becomes colorless. In addition, the photocatalytic mechanism studies have been validated. Different from HSO or HNO, this work has proposed a facile strategy for designing preferable floating photocatalysts using sodium alkoxide.
石墨相氮化碳（g-CN）是一种经典的光催化剂，这不仅归因于其无金属的半导体电子结构，还因其具有可调节的多功能特性。然而，基于有机碱对g-CN进行化学剥离的策略鲜有报道。通过简单的合成方法制备了一系列醇钠介导的g-CN。当照射持续140分钟时，块状g-CN的降解率为39.8%。然而，在相同条件下，g-CN-甲氧基钠（g-CN-MeONa）、g-CN-乙氧基钠（g-CN-EtONa）和g-CN-丁氧基钠（g-CN-BuONa）的降解率分别为55.1%、68.6%和79.1%。此外，g-CN-BuONa已被固定在柔性电纺聚丙烯腈（PAN）纳米纤维上以制备漂浮型光催化剂。扫描电子显微镜（SEM）分析表明，纸基光催化剂PAN/g-CN-BuONa成为了纳米纤维膜（A4尺寸，210毫米×297毫米）。纳米纤维的直径约为350纳米。有趣的是，一旦合成，g-CN-BuONa颗粒会进入纺丝溶液，在那里纳米纤维围绕着它们缠绕，形成一种单分散结构，类似于串珠上1-2微米的珠子或结。对于10毫克/升的亚甲基蓝（MB）溶液，光催化效率在2小时内可达到100%，直至溶液变为无色。此外，光催化机理研究也得到了验证。与硫酸氢根（HSO）或硝酸根（HNO）不同，这项工作提出了一种使用醇钠设计更优漂浮型光催化剂的简便策略。
