School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, China.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Sci Total Environ. 2020 Jul 1;724:138280. doi: 10.1016/j.scitotenv.2020.138280. Epub 2020 Mar 27.
g-CN makes good prospects in photocatalytic field due to its two-dimensional (2D) structure and visible-light activity. How to improve its photocatalytic activity by minimizing the unexpected recombination of photo-induced charge carries on g-CN motivates our research. Herein, mesoporous TiO/g-CN composites are fabricated with 2D TiO(B) nanosheets regulating thermal condensation process of g-CN nanosheets. FT-IR and XPS results suggest that the formation of O-Ti-N chemical bond increases the percentage of N-(C) in the conjugated system, accelerating the transportation of photo-induced electrons. The optical property and PL results illustrate that the formed interface heterojunction with chemical bond facilitates the separation and transfer of photo-induced charge carriers. Hence, the removal constant of TiO/g-CN composites is 46.3 times higher than that of g-CN. This study opens up a new insight into the development of composite materials in the field of organic pollutant treatment.
g-CN 由于其二维（2D）结构和可见光活性，在光催化领域具有广阔的前景。如何通过最小化光致载流子在 g-CN 上的意外复合来提高其光催化活性，激发了我们的研究。在此，通过二维 TiO(B)纳米片调控 g-CN 纳米片的热缩聚过程，制备了介孔 TiO/g-CN 复合材料。FT-IR 和 XPS 结果表明，O-Ti-N 化学键的形成增加了共轭体系中 N-(C)的比例，加速了光致电子的输运。光学和 PL 结果表明，形成具有化学键的界面异质结有利于光致载流子的分离和转移。因此，TiO/g-CN 复合材料的去除常数是 g-CN 的 46.3 倍。本研究为有机污染物处理领域中复合材料的发展开辟了新的视角。
