用于可见光光催化固氮的纳米金属有机框架@缺陷薄膜CN Z型复合材料

Ding Zhu, Wang Shuo, Chang Xue, Wang Dan-Hong, Zhang Tianhao

School of Materials Science and Engineering, School of Physics, Tianjin Key Laboratory of Photonics Materials and Technology for Information Science, Nankai University Tianjin 300350 China

RSC Adv. 2020 Jul 13;10(44):26246-26255. doi: 10.1039/d0ra03562a. eCollection 2020 Jul 9.

Photocatalytic nitrogen fixation has attracted extensive attention in recent years. Studies have shown that catalytic materials with O, N and other defects can effectively reduce the bond energy of N[triple bond, length as m-dash]N triple bond when N is adsorbed on the defects. As an outstanding non-metallic catalyst, g-CN has been widely studied in the field of photocatalytic catalysis, and the nitrogen-defected CN shows promoted photocatalytic activity. Herein, nano-size MOF-74 particles (<20 nm) was dispersed on nitrogen-defected CN thin film (∼4 nm) a simple sol-gel method. The combination of Nano-MOF and defected film CN could effectively improve the photocatalytic activity of nitrogen fixation through Z-scheme mechanism compared with pure defected film CN.

近年来，光催化固氮引起了广泛关注。研究表明，含有O、N等缺陷的催化材料在N吸附在缺陷上时能有效降低N≡N三键的键能。作为一种优秀的非金属催化剂，g-CN在光催化领域得到了广泛研究，而氮缺陷的CN表现出增强的光催化活性。在此，通过简单的溶胶-凝胶法将纳米尺寸的MOF-74颗粒（<20 nm）分散在氮缺陷的CN薄膜（~4 nm）上。与纯缺陷薄膜CN相比，纳米MOF与缺陷薄膜CN的组合通过Z型机制能有效提高固氮的光催化活性。