在 NH2–MIL-101(Fe) 上集成空心球形共价有机框架作为高性能多相光催化剂,Environmental Science: Nano

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在 NH2–MIL-101(Fe) 上集成空心球形共价有机框架作为高性能多相光催化剂
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2022-07-09 , DOI: 10.1039/d2en00393g
Yuqi Wan ₁ , Huaizhi Yang ₁ , Qigao Shang _{1,

2} , Qingrong Cheng ₁ , Hong Zhou ₁ , Zhiquan Pan ₁

Affiliation

基于合成后共价修饰合成了一种新型金属-有机骨架@共价有机骨架（MOF@COF）异质结。在目前的工作中，醛改性的 MOFs (NH ₂ –MIL-101(Fe)) 与共价有机骨架 (Schiff base network-1, SNW-1) 共价键合形成 NH ₂ –MIL-101(Fe)@ SNW-1 (MS- x ) 异质结采用这种策略。MS- x异质结在模拟阳光下对污染物和光催化制氢表现出优异的光降解能力。MS- x异质结的优异光催化性能可归因于 [双键，长度为 m-dash]

NH _{2之间形成-C N-键。}–MIL-101(Fe) 和 SNW-1，提高了电荷分离效率，提高了光催化剂的稳定性。值得一提的是，催化剂表面的SNW-1具有中空结构，可以促进光电荷迁移。此外，结果验证了NH ₂ -MIL-101(Fe)和SNW-1的匹配能带结构可以诱导II型异质结，这可以很好地解释光催化系统的光催化性能提高。该工作不仅为构建高效稳定的MOF@COF异质结提供了新思路，也拓宽了COF基材料的应用领域。

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Integrating hollow spherical covalent organic frameworks on NH2–MIL-101(Fe) as high performance heterogeneous photocatalysts

A novel metal–organic framework@covalent organic framework (MOF@COF) heterojunction was synthesized based on post-synthetic covalent modification. In the present work, aldehyde-modified MOFs (NH₂–MIL-101(Fe)) were covalently bonded with covalent organic frameworks (Schiff base network-1, SNW-1) forming the NH₂–MIL-101(Fe)@SNW-1 (MS-x) heterojunction by using this strategy. The MS-x heterojunction showed excellent photodegradation ability for pollutants and photocatalytic hydrogen production under simulated sunlight. The superior photocatalytic performance of the MS-x heterojunction can be attributed to the formation of –C [double bond, length as m-dash]

N– bonds between NH₂–MIL-101(Fe) and SNW-1, which enhances the charge separation efficiency and improves the stability of the photocatalyst. It is worth mentioning that SNW-1 on the surface of the catalyst had a hollow structure which can promote the photoelectric charge migration. Furthermore, the results verified that the matched band structure of NH₂–MIL-101(Fe) and SNW-1 could induce a type II heterojunction, which could well explain the improved photocatalytic performance of the photocatalytic system. This work not only provides a new idea to construct highly efficient and stable MOF@COF heterojunctions but also broadens the applications of COF-based materials.

更新日期：2022-07-09

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