Volume 62, Issue 36 e202309480
Research Article

Linkage Microenvironment of Azoles-Related Covalent Organic Frameworks Precisely Regulates Photocatalytic Generation of Hydrogen Peroxide

Yi Mou

Yi Mou

College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Changsha, 410082 P. R. China

These authors contributed equally to this work.

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Prof. Xiaodong Wu

Prof. Xiaodong Wu

College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 210009 P. R. China

These authors contributed equally to this work.

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Chencheng Qin

Chencheng Qin

College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Changsha, 410082 P. R. China

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Junying Chen

Junying Chen

College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Changsha, 410082 P. R. China

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Yanlan Zhao

Yanlan Zhao

College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Changsha, 410082 P. R. China

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Prof. Longbo Jiang

Prof. Longbo Jiang

College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Changsha, 410082 P. R. China

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Prof. Chen Zhang

Prof. Chen Zhang

College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Changsha, 410082 P. R. China

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Prof. Xingzhong Yuan

Prof. Xingzhong Yuan

College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Changsha, 410082 P. R. China

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Prof. Edison Huixiang Ang

Prof. Edison Huixiang Ang

Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, Singapore, 637616 Singapore

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Prof. Hou Wang

Corresponding Author

Prof. Hou Wang

College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Changsha, 410082 P. R. China

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First published: 18 July 2023
Citations: 105

Graphical Abstract

A tunable covalent organic framework (COF) platform with three azole-related linkages was prepared through linker exchange reactions. The linkage microenvironment changes the photoelectric properties and photocatalytic performance. The thiazole linkage was more favorable than the oxazole and imidazole linkages for the formation of *O2 intermediate in H2O2 production.

Abstract

Artificial H2O2 photosynthesis by covalent organic frameworks (COFs) photocatalysts is promising for wastewater treatment. The effect of linkage chemistry of COFs as functional basis to photoelectrochemical properties and photocatalysis remains a significant challenge. In this study, three kinds of azoles-linked COFs including thiazole-linked TZ-COF, oxazole-linked OZ-COF and imidazole-linked IZ-COF were successfully synthesized. More accessible channels of charge transfer were constructed in TZ-COF via the donor-π-acceptor structure between thiazole linkage and pyrene linker, leading to efficient suppression of photoexcited charge recombination. Density functional theory calculations support the experimental studies, demonstrating that the thiazole linkage is more favorable for the formation of *O2 intermediate in H2O2 production than that of the oxazole and imidazole linkages. The real active sites in COFs located at the benzene ring fragment between pyrene unit and azole linkage.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

Research data are not shared.

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