Boosting photocatalytic multi-VOCs decontamination over COF-based heterojunction via targeted construction of Ov–M–N charge channel (M = Ti, Zn, W, Ce) and –NH2 functionalization

Applied Catalysis B: Environment and Energy Pub Date : 2024-08-25 DOI:10.1016/j.apcatb.2024.124532

Zhao Hu, Yan Wang, Yujiao Zhang, Hongguo Wu, Wen-Da Oh, Hu Li, Chao He

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Abstract

Covalent organic frameworks (COF) based materials have exhibited excellent gas and visible light absorption capability, yet are very difficult to generate strong oxidative species for photocatalytic mineralization of volatile organic compounds (VOCs). Here, a facile modulation protocol developed could enable the growth of MO (M = Ti, Zn, W, Ce) with oxygen vacancy (Ov) on –NH-functionalized COF surfaces to construct NH–COF/Ov–MO Z–scheme heterojunctions of excellent stability and efficiency (98.3 %) in photo-oxidation of formaldehyde, acetaldehyde, and acetone. The –NH functionalization enhanced VOC chemisorption via H-bond interaction. Moreover, the constructed fast charge transfer channel (Ov–M–N) at the interface not only promoted directional migration of photo-excited carrier, activated adsorbed O and HO to quickly generate strong •OH, but also effectively inhibited injurant formation to realize the precise control of the conversion path. These findings offer new insights into customizing the interfacial structure of COF for indoor air purification.

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通过有针对性地构建 Ov-M-N 电荷通道（M = Ti、Zn、W、Ce）和 -NH2 功能化，在 COF 基异质结上提高光催化净化多种挥发性有机化合物的能力

基于共价有机框架（COF）的材料具有出色的气体和可见光吸收能力，但却很难产生强氧化性物种用于挥发性有机化合物（VOC）的光催化矿化。在此，我们开发了一种简便的调制方案，可使带有氧空位（Ov）的 MO（M = Ti、Zn、W、Ce）在-NH 功能化的 COF 表面生长，从而构建出 NH-COF/Ov-MO Z 型异质结，在甲醛、乙醛和丙酮的光氧化过程中具有出色的稳定性和效率（98.3%）。通过 H 键相互作用，-NH 官能化增强了挥发性有机化合物的化学吸附。此外，界面上构建的快速电荷转移通道（Ov-M-N）不仅促进了光激发载流子的定向迁移，激活吸附的 O 和 HO 快速生成强 -OH，还有效抑制了损伤剂的形成，实现了转化路径的精确控制。这些发现为定制 COF 的界面结构以净化室内空气提供了新的思路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Applied Catalysis B: Environment and Energy

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