Facile fabrication of hybrid carbon molecular sieve membranes based on β-cyclodextrin/polyimide for efficient gas separation

IF 9.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Journal of Materials Chemistry A Pub Date : 2025-09-23 DOI:10.1039/d5ta06017f

Zhongde Dai, Xinyu Wang, Min Deng, Zimei Zhang, Weiyuan Liang, Ruyun Yan, Ziheng Jin, Yao Lu, Lin Yang, Wenju Jiang, Junfeng Zheng

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引用次数: 0

Abstract

The development of high-performance carbon molecular sieve (CMS) membrane materials is critical to advancing next-generation gas separation technology. In this work, β-cyclodextrin (β-CD) was incorporated into polyimide (PI) through a straightforward solution-casting process to fabricate hybrid precursor membranes, which were subsequently carbonized into hybrid CMS membranes. By optimizing both β-CD content and carbonization temperature, the resulting hybrid CMS membranes exhibited exceptional gas separation performances. Under optimal conditions, the hybrid membranes with 3% β-CD, carbonized at 550 °C demonstrated extraordinarily enhanced gas permeability (PCO2=6634.4 Barrer, PH2=15535.3 Barrer, and PHe=4282.9 Barrer, together with significantly improved gas selectivties (αCO2/N2=33.1, αCO2/CH4 =40.0, αH2/N2 =66.5, and αH2/CH4 =79.5), which is 159%, 217%, 536% and 736% times of the pure PI precursor, and surpassing the latest Robeson upper bound for H2 and CO2 separation. The high separation performances together with its facile blending preparation method, making it promising for gas separation.

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基于β-环糊精/聚酰亚胺的杂化碳分子筛膜的制备及其高效气体分离

高性能碳分子筛（CMS）膜材料的开发是推进下一代气体分离技术的关键。本研究将β-环糊精（β-CD）加入到聚酰亚胺（PI）中，通过直接的溶液浇铸工艺制备杂化前驱体膜，然后将其碳化成杂化CMS膜。通过优化β-CD含量和碳化温度，得到的杂化CMS膜具有优异的气体分离性能。在最佳条件下，添加3% β-CD的杂化膜经550℃碳化处理后，透气性显著提高（PCO2=6634.4 Barrer, PH2=15535.3 Barrer, PHe=4282.9 Barrer），气体选择性显著提高（αCO2/N2=33.1, αCO2/CH4 =40.0, αH2/N2 =66.5, αH2/CH4 =79.5），分别是纯PI前驱体的159%，217%，536%和736%，超过了最新的Robeson分离H2和CO2上限。其分离性能好，制备方法简便，在气体分离领域具有广阔的应用前景。

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来源期刊

Journal of Materials Chemistry A CHEMISTRY, PHYSICAL-ENERGY & FUELS

CiteScore

19.50

自引率

5.00%

发文量

1892

审稿时长

1.5 months

期刊介绍： The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.