光催化
共价键
材料科学
共价有机骨架
可见光谱
异质结
纳米技术
多孔性
金属有机骨架
混合材料
氢键
范德瓦尔斯力
三嗪
化学工程
化学
分子
高分子化学
光电子学
工程类
复合材料
有机化学
催化作用
吸附
作者
Fei Li,Dengke Wang,Qiu‐Ju Xing,Gang Zhou,Shanshan Liu,Yan Li,Lingling Zheng,Peng Ye,Jian‐Ping Zou
标识
DOI:10.1016/j.apcatb.2018.10.043
摘要
The search of novel visible-light-responsive porous materials is important because they hold great promise for applications in various fields. Herein, we report a novel strategy based on postsynthetic covalent modification for fabrication of hierarchical porous metal-organic frameworks/covalent organic frameworks (MOF/COF) hybrid materials. For the first time, benzoic acid-modified covalent triazine-based frameworks (B-CTF-1) are covalently bonded with MOFs (NH2-MIL-125(Ti) or NH2-UiO-66(Zr)) by using this strategy. Photocatalytic results show that the hydrogen production rate over 15 wt% NH2-MIL-125(Ti)/B-CTF-1 (15TBC) is 360 μmol·h−1·g−1 under visible light irradiation, which is more than twice as much as that of the B-CTF-1. Meanwhile, the hybrid materials show higher stability as compared to the simple heterostructures of MOFs and COFs connected via Van der Waals force. Photoelectrochemical analyses and controlled experiments indicate that the superior photocatalytic performance of the MOF/COF hybrids can be attributed to the formation of amide bonds between B-CTF-1 and MOFs, which facilitate the charge separation efficiency and improve the stability of the photocatalyst. Finally, a possible mechanism to well explain the improved photocatalytic performance of the photocatalytic system was proposed. The present work provides a new idea to construct highly efficient and stable MOF/COF hybrid systems and broaden the applications of COF-based materials.
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