Li Wanbin, Zhang Yufan, Zhang Congyang, Meng Qin, Xu Zehai, Su Pengcheng, Li Qingbiao, Shen Chong, Fan Zheng, Qin Lei, Zhang Guoliang
Institute of Oceanic and Environmental Chemical Engineering, State Key Lab Breeding Base of Green Chemical Synthesis Technology and Collaborative Innovation Center of Membrane Separation and Water Treatment of Zhejiang Province, Zhejiang University of Technology, Chaowang Road 18#, Hangzhou 310014, China.
Department of Materials Science and Engineering, College of Engineering, University of California, Berkeley, California 94720, USA.
Nat Commun. 2016 Apr 19;7:11315. doi: 10.1038/ncomms11315.
The development of simple, versatile strategies for the synthesis of metal-organic framework (MOF)-derived membranes are of increasing scientific interest, but challenges exist in understanding suitable fabrication mechanisms. Here we report a route for the complete transformation of a series of MOF membranes and particles, based on multivalent cation substitution. Through our approach, the effective pore size can be reduced through the immobilization of metal salt residues in the cavities, and appropriate MOF crystal facets can be exposed, to achieve competitive molecular sieving capabilities. The method can also be used more generally for the synthesis of a variety of MOF membranes and particles. Importantly, we design and synthesize promising MOF membranes candidates that are hard to achieve through conventional methods. For example, our CuBTC/MIL-100 membrane exhibits 89, 171, 241 and 336 times higher H2 permeance than that of CO2, O2, N2 and CH4, respectively.
开发简单、通用的合成金属有机框架（MOF）衍生膜的策略越来越受到科学界的关注，但在理解合适的制备机制方面仍存在挑战。在此，我们报道了一种基于多价阳离子取代实现一系列MOF膜和颗粒完全转化的途径。通过我们的方法，可以通过将金属盐残余物固定在孔穴中来减小有效孔径，并暴露合适的MOF晶体晶面，以实现具有竞争力的分子筛分能力。该方法还可更广泛地用于合成各种MOF膜和颗粒。重要的是，我们设计并合成了通过传统方法难以实现的有前景的MOF膜候选物。例如，我们的CuBTC/MIL-100膜对H2的渗透率分别比CO2、O2、N2和CH4高89倍、171倍、241倍和336倍。
