Abstract

Cellulose-based mixed-matrix membranes containing polyethylenimine-modified graphene oxide (PEI-GO) and Zn²⁺ ions were fabricated and used for gas separation. The incorporation of PEI-GO effectively hinders the crystallinity of regenerated cellulose, and PEI-GO was compatible with cellulose matrix and uniformly distributed within the matrix. X-ray photoelectron spectrum revealed the amino group on GO surface can effectively coordinate with Zn²⁺ ions in the membrane. The Zn²⁺ ions content in the membranes increased when increasing the PEI-GO addition. The optimum separation performance was achieved over the membrane with 17 wt‰ PEI-GO (RC-17) wiht the highest zinc content of 24.2 wt%. The corresponding permeability of CO₂ is as high as 268.9 Barrer, and the CO₂/N₂ and CO₂/CH₄ ideal selectivities could reach 48.9 and 57.4, respectively. The enhancement of CO₂ transportation was attributed to both the regulated microstructure of cellulose membrane by PEI-GO and the π-complexation mechanism of Zn²⁺ ions with CO₂ molecules. The prepared membranes would have a highly potential use in the field of CO₂ separation.

中文翻译：

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具有聚乙烯亚胺改性的氧化石墨烯和锌离子的纤维素膜，可促进气体分离

摘要

制备了包含聚乙烯亚胺改性的氧化石墨烯（PEI-GO）和Zn ²⁺离子的纤维素基混合基质膜，并将其用于气体分离。PEI-GO的掺入有效地阻碍了再生纤维素的结晶性，并且PEI-GO与纤维素基质相容并均匀地分布在基质中。X射线光电子能谱表明，GO表面的氨基可以与膜中的Zn ²⁺离子有效配位。当增加PEI-GO添加量时，膜中的Zn ²⁺离子含量增加。在具有最高锌含量24.2 wt％的17 wt‰PEI-GO（RC-17）的膜上实现了最佳分离性能。对应的CO ₂渗透率高达268.9 Barrer，CO ₂ / N ₂和CO ₂ / CH _4的理想选择性分别达到48.9和57.4。CO ₂转运的增强既归因于PEI-GO调节纤维素膜的微观结构，也归因于Zn ²⁺离子与CO ₂分子的π络合机理。制备的膜将在CO ₂分离领域中具有很高的潜在用途。