Study of pyrene-based covalent organic frameworks for efficient photocatalytic oxidation of low-concentration NO

Xiao, Zhiyu; Ren, Yong; Chen, George Zheng; Sun, Yong; Wang, Chengjun; He, Jun

Abstract

This research presents the development of innovative pyrene-based COFs aimed at enhancing photocatalytic oxidation of low-concentration nitrogen oxide. By precisely modifying the structural length and incorporating additional functional groups into pyrene-based COFs, we identified TAPPy-DMTP-COF as the most effective performer. This COF, characterized by its shortest length and the presence of -OCH3 functional groups, demonstrated superior performance, likely due to reduced electron transfer resistance and the presence of additional oxygen active sites. Building on the potential of TAPPy-DMTP-COF, we developed a covalently linked Type-II heterostructure with g-C3N4. The resulting heterostructure, 40TAPPy-DMTP-COF/g-C3N4, with a 40 % mass fraction of TAPPy-DMTP-COF, was confirmed using SEM, XRD, and other techniques. It exhibited an exceptional photocatalytic efficiency of 45.8 % and NO3- selectivity of 97.4 %. This remarkable performance can be attributed to improved electron communication facilitated by chemical bonding, as confirmed by XPS results. Additionally, the optimized heterostructure interface not only improved electron transfer but also inhibited the recombination of electron-hole pairs. The growth of TAPPy-DMTP-COF on the surface of g-C3N4 significantly enhanced visible light absorption, as confirmed by UV–vis spectroscopy. This study not only underscores the importance of precise control over the structural features of pyrene-based COFs but also introduces a novel approach for enhancing NO oxidation. By constructing a covalently linked Type-II heterostructure, we have significantly enhanced the interface interaction within the heterostructure, leading to superior photocatalytic performance.

Citation

Xiao, Z., Ren, Y., Chen, G. Z., Sun, Y., Wang, C., & He, J. (2024). Study of pyrene-based covalent organic frameworks for efficient photocatalytic oxidation of low-concentration NO. Journal of Environmental Chemical Engineering, 12(5), Article 113470. https://doi.org/10.1016/j.jece.2024.113470

• Journal Article Type: Article
• Acceptance Date: Jun 30, 2024
• Online Publication Date: Jul 1, 2024
• Publication Date: 2024-10
• Deposit Date: Jul 15, 2024
• Publicly Available Date: Jul 15, 2024
• Journal: Journal of Environmental Chemical Engineering
• Print ISSN: 2213-2929
• Electronic ISSN: 2213-3437
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 12
• Issue: 5
• Article Number: 113470
• DOI: https://doi.org/10.1016/j.jece.2024.113470
• Keywords: Chemically bonded heterostructure; Covalent organic framework; In-Situ Growth; Photocatalytic NO removal; Graphitic carbon nitride
• Public URL: https://nottingham-repository.worktribe.com/output/37304633
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S2213343724016002
• Additional Information: This article is maintained by: Elsevier; Article Title: Study of pyrene-based covalent organic frameworks for efficient photocatalytic oxidation of low-concentration NO; Journal Title: Journal of Environmental Chemical Engineering; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.jece.2024.113470; Content Type: article; Copyright: © 2024 The Authors. Published by Elsevier Ltd.