均分布的混合矩阵膜通过一种可处理溶液的策略来分离/
Yafei Su1, Dongyang Li1, Meixia Shan1
1School of Chemical, Engineering, Zhengzhou University, 450001, Zhengzhou, P. R. China.
Angewandte Chemie (International ed. in English)
|December 21, 2023
概括
使用Ag4tz4对ZIF-67金属有机框架 (MOF) 填充剂的表面修饰可以防止颗粒聚合在混合矩阵膜 (MMM) 中. 这一突破使得高负载MMM具有卓越的C3H6/C3H8分离选择性和透性,以及优异的稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 纳米技术纳米技术
背景情况:
- 填充剂颗粒聚合是混合矩阵膜 (MMM) 的一个主要挑战,限制了填充剂负载到10-15%的重量,并阻碍了性能.
- 填充物颗粒的聚集会对膜分离效率和透性产生负面影响.
研究的目的:
- 开发ZIF-67金属有机框架 (MOF) 填充剂的新型表面修饰策略,以提高它们与聚合物矩阵的兼容性.
- 为了合成高负载的MMMs,减少填充剂聚合和提高C3H6/C3H8混合物的分离性能.
- 通过分子动力学模拟来研究改善兼容性和分离性能的潜在机制.
主要方法:
- 用Ag4tz4.4进行ZIF-67MOF填充剂的表面修改.
- 用修改的ZIF-67.7制造混合矩阵膜 (MMM).
- 对C3H6/C3H8混合物的气体分离性能测试.
- 分子动力学模拟以分析填充剂-聚合物相互作用和气体运输.
主要成果:
- 合成的高负载MMMs (>15重量%填充剂) 与显著减少的ZIF-67聚合物.
- 在C3H6/C3H8混合物中实现了前所未有的39的分离选择性,其高透率为99 Barrer.
- 分子动力学模拟证实了ZIF-67与聚合物矩阵之间的增强兼容性,这是由于Ag4tz4修饰.
- 证明了出色的压力和温度耐受性,长期稳定性超过900小时.
结论:
- 对MOF填充剂的表面修改是一种有效的策略,可以克服MMM中的聚合问题.
- 与现有材料相比,开发的Ag4tz4修饰的ZIF-67 MMMs在C3H6/C3H8分离方面提供了更高的性能.
- 这种方法为制造各种气体分离应用的高性能MMM提供了途径.
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