Enhanced selectivity in mixed matrix membranes for CO2 capture through efficient dispersion of amine-functionalized MOF nanoparticles
Enhanced selectivity in mixed matrix membranes for CO2 capture through efficient dispersion of amine-functionalized MOF nanoparticles
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DOI：
10.1038/nenergy.2017.86
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发表时间：
2017-07-01
期刊：
影响因子：
56.7
通讯作者：
Sivaniah, Easan
中科院分区：
文献类型：
--
作者：
Ghalei, Behnam;Sakurai, Kento;Sivaniah, Easan
与纯聚合物基质相比，用于气体分离的混合基质膜（MMMs）具有更高的选择性，但通常报道其固有渗透性较低，这对在大规模碳捕获项目中实施膜技术具有重大的成本影响。高渗透性聚合物很少产生足够的选择性，以实现节能的CO2捕获。在这里，我们报告了由于胺功能化的纳米金属有机框架（MOF）添加剂的有效分散，高渗透性聚合物中的选择性显著增强。在最佳混合条件下，增强效果以最小的总渗透率损失出现。纳米尺寸的MOF增强了其在聚合物基体中的分散，从而最大限度地减少了颗粒周围非选择性微孔的形成。这种mof的胺化增加了它们与聚合物基体的相互作用，导致测量的刚性和增强的整体复合材料的选择性。在三种不同的聚合物体系中验证了MOF的最佳性能，以及适合碳捕获的压力和温度范围。
Mixed matrix membranes (MMMs) for gas separation applications have enhanced selectivity when compared with the pure polymer matrix, but are commonly reported with low intrinsic permeability, which has major cost implications for implementation of membrane technologies in large-scale carbon capture projects. High-permeability polymers rarely generate sufficient selectivity for energy-efficient CO2 capture. Here we report substantial selectivity enhancements within high-permeability polymers as a result of the efficient dispersion of amine-functionalized, nanosized metal-organic framework (MOF) additives. The enhancement effects under optimal mixing conditions occur with minimal loss in overall permeability. Nanosizing of the MOF enhances its dispersion within the polymer matrix to minimize non-selective microvoid formation around the particles. Amination of such MOFs increases their interaction with the polymer matrix, resulting in a measured rigidification and enhanced selectivity of the overall composite. The optimal MOF MMM performance was verified in three different polymer systems, and also over pressure and temperature ranges suitable for carbon capture.