Zhao XinYu, Zhang Yi, Zhao Xia, Wang Xin, Zhao Yingnan, Tan Huaqiao, Zhu Haotian, Ho Wingkei, Sun Huiying, Li Yangguang
Key Laboratory of Polyoxometalate Science of the Ministry of Education, Faculty of Chemistry , Northeast Normal University , Changchun , 130024 , China.
Department of Science and Environmental Studies and State Key Laboratory in Marine Pollution , The Education Universi-ty of Hong Kong , Tai Po, N.T. , Hong Kong 999077 , P. R. China.
ACS Appl Mater Interfaces. 2019 Aug 7;11(31):27934-27943. doi: 10.1021/acsami.9b08483. Epub 2019 Jul 25.
Construction of various nanostructure g-CN, especially those with a tubular structure, is gaining considerable research interest because of their large specific surface area, high carrier transport efficiency, and excellent mass transfer. In this study, a novel multistage tubular g-CN (TCN) has been prepared by the copolymerization of melamine formaldehyde (MF) resin with urea. With the introduction of MF resin, the electrostructure of TCN and its hydrophilicity property have been obviously ameliorated, thereby enhancing its visible-light absorption and improving the interface contact between TCN and water. Moreover, photocurrent response and electrochemical impedance spectra indicate that the special multistage tubular structure facilitates the spatial charge transfer and photogenerated carrier separation. Thus, the as-prepared TCN exhibits excellent photoactivities under visible-light irradiation. Among the samples, TCN-0.1 shows the best performance. Its hydrogen evolution rate is approximately 7505 μmol·g·h, which is 6.05 times greater than that of g-CN (prepared by urea at 600 °C), and its apparent quantum efficiency is nearly 19.2% at 400 nm. In addition, TCN is also endowed with outstanding visible-light performance and durability for the degradation of tetracycline and methyl orange. This work might provide a significant inspiration for the design of new, highly efficient g-CN-based materials and further deepen our understanding of the preparation of tubular photocatalysts.
各种纳米结构的石墨相氮化碳（g-CN）的构建，尤其是那些具有管状结构的，因其大的比表面积、高的载流子传输效率和优异的传质性能而受到了广泛的研究关注。在本研究中，通过三聚氰胺甲醛（MF）树脂与尿素的共聚制备了一种新型的多级管状g-CN（TCN）。随着MF树脂的引入，TCN的电子结构及其亲水性得到了明显改善，从而增强了其可见光吸收并改善了TCN与水之间的界面接触。此外，光电流响应和电化学阻抗谱表明，特殊的多级管状结构有利于空间电荷转移和光生载流子分离。因此，所制备的TCN在可见光照射下表现出优异的光活性。在这些样品中，TCN-0.1表现出最佳性能。其析氢速率约为7505 μmol·g·h，是g-CN（由尿素在600℃制备）的6.05倍，其在400 nm处的表观量子效率接近19.2%。此外，TCN在降解四环素和甲基橙方面还具有出色的可见光性能和耐久性。这项工作可能为新型高效g-CN基材料的设计提供重要启示，并进一步加深我们对管状光催化剂制备的理解。
