期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 35, 页码 42035-42043出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c11775
关键词
covalent organic nanosheets; mechanochemistry; photocatalysis; heterojunction; substoichiometry
资金
- National Key Research and Development Program [2016YFA0203100]
- National Natural Science Foundation of China [21537004, 21621064, 21777169]
This research utilized the remaining aldehyde groups in a substoichiometric covalent organic framework to achieve precise construction of 2D/2D covalent organic nanosheets heterojunctions through mechanochemical methods, resulting in superior photoinduced charge generation and separation, and a significant enhancement in photocatalytic degradation efficiency.
Combining different semiconductor materials to construct heterojunctions is a promising method to achieve efficient photocatalysis; however, it is still a challenge to accurately construct heterojunctions through molecular regulation. In this work, we take advantage of the remaining aldehyde groups in a substoichiometric covalent organic framework (denoted as PTO-COF) to achieve precise construction of covalently linked 2D/2D covalent organic nanosheets (CONs) heterojunctions through mechanochemical methods. The ultrathin structure of CONs endowed them with superior photoinduced charge generation and separation. Additionally, the energy bands of two CONs materials in heterojunctions were precisely coupled in a Z-scheme by the well-designed covalent linkages, which lead to a 190% enhancement of photocatalytic degradation efficiency for PTO/TpMa CONs heterojunctions as compared with pure COFs. This work provides new insights for design and synthesis of innovative 2D organic heterojunction photocatalysts.
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