| Autor: |
Li, Zhuoxue, Shi, Yunlei, Ding, Yimian, Xiong, Dazhen, Li, Zhiyong, Wang, Huiyong, Qiu, Jikuan, Xuan, Xiaopeng, Wang, Jianji |
| Zdroj: |
Langmuir; February 2024, Vol. 40 Issue: 6 p3133-3141, 9p |
| Abstrakt: |
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 (C3im) to prepare a series of functionalized Zr-MOFs (MOF-C3im). It is found that MOF-C3im is an excellent emulsifier to construct stable and CO2-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 CO2and N2alternatively at room temperature because CO2and 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. |
| Databáze: |
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