Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 44, Pages 19633-19638Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202005277
Keywords
chemical stability; covalent organic frameworks; hydrophobicity; oil; water separation
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Funding
- National Natural Science Foundation of China [21571079, 21621001, 21390394, 21571076, 21571078]
- 111 project [BP0719036, B17020]
- program for JLU Science and Technology Innovative Research Team
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The development of three-dimensional (3D) covalent organic frameworks (COFs) with high chemical stability is of critical importance for their practical use. In this work, it is demonstrated that the stability of 3D COFs can be improved by periodic decoration of isopropyl groups on their backbones. Owing to the strong hydrophobicity of the alkyl groups, the resultant COFs show high crystallinity, permanent pores, and exceptional stability in harsh environments, such as strong acids (3 mHCl or 3 mH(2)SO(4)for one week), a strong base (20 mNaOH for one week), and boiling water (100 degrees C for one month). Furthermore, these highly stable and hydrophobic COFs display excellent oil/water separation performance with >99 % separation efficiency over a wide pH range. This work demonstrates the use of alkyl decoration in 3D COFs to tune their chemical stability and expand their potential applications.
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