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Metal-Free Fenton-like Photocatalysts Based on Covalent Organic Frameworks

preprint
submitted on 15.03.2021, 04:40 and posted on 16.03.2021, 06:42 by Qiaobo Liao, Can Ke, Dongni Wang, Yiying Zhang, Qingwen Han, Yifan Zhang, Kai Xi
The Fenton reaction is one of the most efficient and widely used advanced oxidation processes for remediating the ever-growing water pollution. Metal-free photocatalysts for Fenton-like reactions have gathered enormous scientific interest for their advantages including board pH operation range and high stability. Herein, we demonstrate a metal-free covalent organic framework (COF)-based standalone photocatalyst with superior reactivity and reusability for Fenton-like reactions at acid and neutral pH solutions, which can be attributed to its large porosity, high density of the photoactive triazine moiety, vertical π arrays formed by eclipsed layer stacking and the β‑ketoenamine linkage. Our experiments showed that the photocatalyst can absorb visible light effectively for activation of H2O2, producing abundant reactive oxygen species including superoxide radical (O2·-), hydroxyl radical (·OH), and singlet oxygen (1O2) for oxidizing organic pollutants. This work not only provides an efficient metal-free photocatalyst for Fenton-like reactions, but also paves the way for COFs towards advanced oxidation processes, opening up the possibilities to their future applications in industry.

Funding

Ministry of Science and Technology of China (2017YFA0700500)

Shenzhen Science and Technology Innovation Committee (No. JCYJ20180307151441165)

Fundamental Research Funds for the Central Universities (No. 020514380221)

History

Email Address of Submitting Author

xikai@nju.edu.cn

Institution

Nanjing University

Country

P. R. China

ORCID For Submitting Author

0000-0002-8770-5956

Declaration of Conflict of Interest

There is no conflict of interest to declare.

Version Notes

version 1.0

Exports