Sandwich membranes through a two-dimensional confinement strategy for gas separation†,Materials Chemistry Frontiers

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Sandwich membranes through a two-dimensional confinement strategy for gas separation†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-08-20 00:00:00 , DOI: 10.1039/c8qm00351c
Zixi Kang _{1,

2,

3,

4} , Sasa Wang _{1,

2,

3,

4} , Rongming Wang _{1,

2,

3,

4} , Hailing Guo _{2,

4,

5,

6,

7} , Ben Xu _{1,

2,

3,

4} , Shou Feng _{1,

2,

3,

4} , Lili Fan _{1,

2,

3,

4} , Liangkui Zhu _{4,

8,

9,

10} , Wenpei Kang _{1,

2,

3,

4} , Jia Pang _{1,

2,

3,

4} , Hanyi Sun _{1,

2,

3,

4} , Xinxin Du _{1,

2,

3,

4} , Minghui Zhang _{1,

2,

3,

4} , Daofeng Sun _{1,

2,

3,

4}

Affiliation

Metal–organic frameworks (MOFs) with designable pore environments can be involved in graphene oxide (GO) layers as the filters to tailor the channels in laminar membranes for precise molecular separation. The well-distributed fillers, high compatibility between fillers and GO, and thin selective layers are critical aspects for capitalizing on the positive effect induced by the addition of a microporous phase. Herein, a two-dimensional confinement strategy for constructing the composite membrane is deduced by the in situ conversion of the metal hydroxide/GO precursors into MOF/GO “sandwich” membranes. This method is confirmed to be feasible for the creation of an ultra-thin composite membrane with uniform MOF filler dispersion and good compatibility with GO layers. The sandwich membranes show enhanced H₂/CO₂ separation performance: H₂ permeance of 5922 ± 1000 GPU and H₂/CO₂ selectivity of 75 ± 4 at 25 °C, which is six-fold increased compared with the GO membrane. Due to the combination of GO and MOF, the membrane also exhibited a H₂ permeance of 3654 ± 252 GPU and H₂/CO₂ selectivity of 31 ± 3 at 150 °C with the feed gas containing water vapor. Such a nanoscale confinement approach can be extended to other composite membranes, providing valuable insights into the design and development of advanced materials for membrane-based efficient molecular separation.

中文翻译：

通过二维限制策略将夹心膜用于气体分离†

具有可设计孔隙环境的金属有机骨架（MOF）可以作为氧化石墨烯（GO）层的过滤器，以定制层状膜中的通道，以实现精确的分子分离。分布均匀的填料，填料与GO之间的高度相容性以及薄的选择层是利用由添加微孔相引起的积极影响的关键方面。在此，通过将金属氢氧化物/ GO前体原位转化为MOF / GO“三明治”膜，推导了构建复合膜的二维限制策略。该方法被证实对于创建具有均匀MOF填料分散性和与GO层良好相容性的超薄复合膜是可行的。夹心膜显示出增强的H₂ / CO₂分离性能：25°C下H_2的渗透率为5922±1000 GPU，H₂ / CO_2的选择性为75±4，与GO膜相比增加了六倍。由于GO和MOF的结合，在含水蒸气的进料气中，该膜在150°C时的H₂渗透率为3654±252 GPU，H₂ / CO₂选择性为31±3。这种纳米级的限制方法可以扩展到其他复合膜，为基于膜的有效分子分离的先进材料的设计和开发提供有价值的见解。

更新日期：2018-08-20

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