期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 10, 期 41, 页码 22175-22181出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ta04670a
关键词
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资金
- Tianjin Natural Science Foundation [20JCJQJC00170]
- 111 Project [B12015]
- National Natural Science Foundation of China [22103048]
This study developed a post-synthetic modification approach to enhance the gas separation performance of an ultramicroporous MOF. By substituting Cl- with BF4- and increasing the test temperature, they observed improved adsorption capacity and selective adsorption of C2H2 over CO2.
Developing new strategies to enhance adsorbents' gas separation performance is highly desirable. In this contribution, we created a post-synthetic modification approach to enhance the C2H2/CO2 separation performance for an ultramicroporous MOF (NKMOF-2) platform that underwent a single-crystal-to-single-crystal in the counter anion exchange process. Substitution of Cl- with BF4- not only greatly improved the water stability of the NKMOF-2 platform but also enhanced their adsorption capacity and separation performance. Mixture gas breakthrough experiments revealed that the anion exchange strategy was a powerful approach for boosting the selective adsorption of C2H2 over CO2. Moreover, we first observed that the C2H2/CO2 separation performance could be enhanced dramatically by elevating the test temperature. This study not only enriches the toolbox to create efficient MOF adsorbents for gas separation but also provides a fundamental understanding of the enhanced gas uptake and separation performance.
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