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基于铝离子配位构筑超分子聚合物网络膜及其H2/CO2分离性能

作者：周子豪，何悦，董亮亮，张春芳，白云翔

单位：江南大学合成与生物胶体教育部重点实验室化学与材料工程学院，无锡 214122

关键词：芳醚型聚苯并咪唑；配位交联反应；膜； H2/CO2分离

DOI号： 10.16159/j.cnki.issn1007-8924.2025.03.012

分类号： TQ028.8

出版年,卷(期):页码： 2025,45(3):118-126

摘要：

基于铝离子和芳醚型聚苯并咪唑（OPBI）之间的配位交联反应，通过膜浸泡法制备了OPBI-Al3+膜。研究了水溶液中Al3+的浓度对膜物理化学性能及其H2/CO2分离性能的影响。研究表明：OPBI链段上咪唑环的N-可以与水溶液中的Al3+发生配位交联反应，形成致密的交联结构。随着水溶液中Al3+浓度的增加，OPBIAl3+膜的凝胶含量、交联度以及密度先增加随后几乎不再变化。当Al3+浓度为8.44×10-2 mol/L时，在35 ℃下，OPBI-Al3+-8.44膜的H2渗透率为2.79 Barrer，略低于纯OPBI膜，而H2/CO2分离选择性达到了23.60，比纯膜提高了438.81%，分离性能突破了2008年的Robeson上限。

In this paper, OPBI-Al3+ membranes were prepared by membrane immersion method based on the coordination cross-linking reaction between aluminum ions and aryl ether polybenzimidazole (OPBI). The effects of Al3+ concentration in aqueous solution on the physicochemical properties and H2/CO2 separation performance of the membrane were studied. The results show that the N- of the imidazole ring on the OPBI chain can coordinate and cross-link with Al3+ in the aqueous solution to form a dense cross-linked structure. With the increase of Al3+ concentration in aqueous solution, the gel content, cross-linking degree and density of OPBI-Al3+ membrane first increased, and then almost unchanged. When the concentration of Al3+ was 8.44×10-2 mol/L, the H2 permeability of OPBI-Al3+-8.44 membrane was 2.79 Barrer at 35 ℃, which was slightly lower than that of the pure membrane, while the selectivity of H2/CO2 reached 23.60, which was 438.81% higher than that of the pure membrane, breaking through the upper limit of Robeson in 2008.

基金项目：

国家自然科学基金面上项目（22075107）

作者简介：

周子豪（2000-），男，湖北荆州人，硕士生，主要从事气体分离膜的研究

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