DeCoste Jared B, Denny Michael S, Peterson Gregory W, Mahle John J, Cohen Seth M
Edgewood Chemical Biological Center , US Army Research, Development, and Engineering Command , 5183 Blackhawk Rd , Aberdeen Proving Ground , MD 21010 , USA . Email:
Leidos, Inc. , PO Box 68, Gunpowder , MD 21010 , USA.
Chem Sci. 2016 Apr 21;7(4):2711-2716. doi: 10.1039/c5sc04368a. Epub 2016 Jan 13.
Metal-organic frameworks (MOFs) in their free powder form have exhibited superior capacities for many gases when compared to other materials, due to their tailorable functionality and high surface areas. Specifically, the MOF HKUST-1 binds small Lewis bases, such as ammonia, with its coordinatively unsaturated copper sites. We describe here the use of HKUST-1 in mixed-matrix membranes (MMMs) prepared from polyvinylidene difluoride (PVDF) for the removal of ammonia gas. These MMMs exhibit ammonia capacities similar to their hypothetical capacities based on the weight percent of HKUST-1 in each MMM. HKUST-1 in its powder form is unstable toward humid conditions; however, upon exposure to humid environments for prolonged periods of time, the HKUST-1 MMMs exhibit outstanding structural stability, and maintain their ammonia capacity. Overall, this study has achieved all of the critical and combined elements for real-world applications of MOFs: high MOF loadings, fully accessible MOF surfaces, enhanced MOF stabilization, recyclability, mechanical stability, and processability. This study is a critical step in advancing MOFs to a stable, usable, and enabling technology.
与其他材料相比，金属有机框架（MOF）的自由粉末形式对许多气体表现出卓越的吸附能力，这归因于其可定制的功能和高比表面积。具体而言，MOF HKUST-1通过其配位不饱和铜位点结合小的路易斯碱，如氨。我们在此描述了HKUST-1在由聚偏二氟乙烯（PVDF）制备的混合基质膜（MMM）中用于去除氨气的应用。这些MMM的氨吸附能力与其基于每个MMM中HKUST-1重量百分比的假设吸附能力相似。粉末形式的HKUST-1在潮湿条件下不稳定；然而，在长时间暴露于潮湿环境后，HKUST-1 MMM表现出出色的结构稳定性，并保持其氨吸附能力。总体而言，本研究实现了MOF实际应用的所有关键和综合要素：高MOF负载量、完全可及的MOF表面、增强的MOF稳定性、可回收性、机械稳定性和可加工性。本研究是将MOF推进到稳定、可用和实用技术的关键一步。
