CIESC Journal ›› 2017, Vol. 68 ›› Issue (11): 4323-4332.DOI: 10.11949/j.issn.0438-1157.20170553

Previous Articles     Next Articles

Preparation and CO2 separation performance of mixed matrix membranes incorporated with open metal sites-containing MIL-101(Cr)

GUO Xiangyu, YANG Qingyuan   

  1. State Key Laboratory of Organic-Inorganic Composites, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2017-05-04 Revised:2017-07-03 Online:2017-11-05 Published:2017-11-05
  • Supported by:

    supported by the National Key Research Program of China (2016YFA0201701) and the National Natural Science Foundation of China (21322603, 21276009).

含开放金属位点MIL-101(Cr)掺杂的混合基质膜制备及其CO2分离性能

郭翔宇, 阳庆元   

  1. 北京化工大学化学工程学院, 有机-无机复合材料国家重点实验室, 北京 100029
  • 通讯作者: 阳庆元
  • 基金资助:

    国家重点研发计划项目(2016YFA0201701);国家自然科学基金项目(21322603,21276009)。

Abstract:

Mixed matrix membranes (MMMs) were prepared by combining open metal sites-containing MIL-101(Cr) with three different kinds of polymers. CO2 separation performance of these prepared MMMs was further examined from the aspects of filler structure, polymer properties, and filler-polymer interface conditions. Benefiting from the large pore aperture and strong Lewis acid-base interactions between the open Cr(Ⅲ) sites and CO2 molecules, the incorporation of MIL-101(Cr) can greatly improve the gas permeability and separation factor of PSF membrane. The results indicate that when polymer with high selectivity and permeability is used, only the gas permeability is improved with the CO2 separation factor slightly decreased. When polymer with high chain mobility is used, the surface pores could be blocked by the polymer chains, leading to obvious decrease in gas permeability of the MMMs.

Key words: metal-organic frameworks, open metal sites, membranes, carbon dioxide, separation

摘要:

以结构中含有开放金属位点的MIL-101(Cr)作为填料与3种不同的聚合物复合制备了混合基质膜,从填料结构、聚合物性质及填料-聚合物界面状况等角度对混合基质膜的CO2分离性能进行了分析。结果表明,由于MIL-101(Cr)较大的孔道尺寸以及结构中开放金属Cr(Ⅲ)位点与CO2分子间的Lewis酸碱作用,其掺杂能够同时显著提高PSF膜的CO2通量及分离因子。而当聚合物渗透性及选择性较高时,MIL-101(Cr)的掺杂仅提高了气体通量,CO2分离因子则略有降低。当聚合物分子链柔性较大时,MIL-101(Cr)的表面孔道会被分子链堵塞,造成混合基质膜气体通量的显著下降。

关键词: 金属-有机骨架材料, 开放金属位点, 膜, 二氧化碳, 分离

CLC Number: