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Efficient Capture and Low Energy Release of NH 3 by Azophenol Decorated Photoresponsive Covalent Organic Frameworks.
- Source :
-
Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2024 Aug 19; Vol. 63 (34), pp. e202406855. Date of Electronic Publication: 2024 Jul 24. - Publication Year :
- 2024
-
Abstract
- In NH <subscript>3</subscript> capture technologies, the desorption process is usually driven by high temperature and low pressure (such as 150-200 °C under vacuum), which accounts for intensive energy consumption and CO <subscript>2</subscript> emission. Developing light responsive adsorbent is promising in this regard but remains a great challenge. Here, we for the first time designed and synthesized a light responsive azophenol-containing covalent organic framework (COF), COF-HNU38, to address this challenge. We found that at 25 °C and 1.0 bar, the cis -COF exhibited a NH <subscript>3</subscript> uptake capacity of 7.7 mmol g <superscript>-1</superscript> and a NH <subscript>3</subscript> /N <subscript>2</subscript> selectivity of 158. In the adsorbed NH <subscript>3</subscript> , about 29.0 % could be removed by vis-light irradiated cis-trans isomerization at 25 °C, and the remaining NH <subscript>3</subscript> might be released at 25 °C under vacuum. Almost no decrease in adsorption capacity was observed after eight adsorption-desorption cycles. As such, an efficient NH <subscript>3</subscript> capture and low energy release strategy was established thanks to the multiple hydrogen bond interactions (which are strong in total but weak in individuals) between NH <subscript>3</subscript> and the smart COF, as well as the increased polarity and number of hydrogen bond sites after the trans-cis isomerization.<br /> (© 2024 Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1521-3773
- Volume :
- 63
- Issue :
- 34
- Database :
- MEDLINE
- Journal :
- Angewandte Chemie (International ed. in English)
- Publication Type :
- Academic Journal
- Accession number :
- 38871653
- Full Text :
- https://doi.org/10.1002/anie.202406855