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Zr-Based MOF-Stabilized CO 2 -Responsive Pickering Emulsions for Efficient Reduction of Nitroarenes.
- Source :
-
Langmuir : the ACS journal of surfaces and colloids [Langmuir] 2024 Feb 13; Vol. 40 (6), pp. 3133-3141. Date of Electronic Publication: 2024 Feb 02. - Publication Year :
- 2024
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Abstract
- A Pickering emulsion is a natural microreactor for interfacial catalysis in which an emulsifier is critical. Recently, a metal-organic framework (MOF) has attracted attention to emulsify water-organic mixtures for constructing a Pickering emulsion. However, a few stimuli-responsive Pickering emulsions based on MOFs have been reported, and the MOF emulsifiers cannot be regenerated at room temperature. Herein, the Zr-MOF with a rodlike morphology is synthesized using ionic liquid as a modulator and then modified with n -(trimethoxysilylpropyl)imidazole (C <subscript>3</subscript> im) to prepare a series of functionalized Zr-MOFs (MOF-C <subscript>3</subscript> im). It is found that MOF-C <subscript>3</subscript> im is an excellent emulsifier to construct stable and CO <subscript>2</subscript> -responsive Pickering emulsions even at low content (>0.20 wt %). Notably, the emulsification and demulsification of the emulsions can be easily and reversibly switched by bubbling of CO <subscript>2</subscript> and N <subscript>2</subscript> alternatively at room temperature because CO <subscript>2</subscript> and imidazole molecules anchored on the Zr-MOF underwent a reversible acid-base reaction, resulting in an obvious change in the wettability of the emulsifier. As a proof of concept, the reduction reactions of nitrobenzene have been successfully carried out in these Pickering emulsions, demonstrating the efficient integration as a microreactor for chemical reaction, product separation, and emulsifier recycling under ambient conditions. This strategy provides an innovative option to develop stimulus-responsive Pickering emulsions for sustainable chemical processes.
Details
- Language :
- English
- ISSN :
- 1520-5827
- Volume :
- 40
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- Langmuir : the ACS journal of surfaces and colloids
- Publication Type :
- Academic Journal
- Accession number :
- 38307089
- Full Text :
- https://doi.org/10.1021/acs.langmuir.3c03564