金屬有機框架／碳分子篩膜對溫室氣體分離之研究

Investigation of Metal Organic Frame/Carbon Molecular Sieve Composite Membrane for Greenhouse Gas Separation

本文研究探討了溫室效應和全球暖化等環境問題，特別是氣體分離技術在解決溫室氣體排放問題中的潛力。薄膜分離技術是一種有效的氣體分離方法，其中碳膜作為無機薄膜材質之一，展現了優越的氣體分離性能。碳膜可分為分子篩選型和選擇性吸附型，分別適用於不同氣體分子的分離。此外研究表明，金屬有機骨架（MOFs）中的沸石咪唑骨架（ZIFs）也是潛在的多孔填料，對氣體分離等應用領域具有潛力。提出了將聚醚醯亞胺（PEI）、ZIFs和碳分子篩膜（CMS）等材料結合，以提高薄膜性能的複合技術。對ZIF-67-Membrane進行不同堆積時間的實驗，並通過PEI修飾來改進其分離性能。經過修飾和碳化後的薄膜表現出增強的氣體吸附能力和選擇性。這些結果顯示，沉積2天的ZIF-67/CMS-Membrane氣體對氮氣具有良好的擴散選擇率，H2/CH4、N2/CO2、N2/CO、N2/CH4，其值分別為3.54、1.52、2.04、6.80，對氮氣具有一定的分離效果。使用ZIF-67作為無機表面修飾並配合後合成有利於形成薄、交聯良好且穩定的ZIF-67-Membrane，具有潛在應用價值。

This study explores environmental issues such as greenhouse effects and global warming, focusing on the potential of gas separation technology in addressing greenhouse gas emissions. Membraneseparation techniques have proven to be effective for gas separation, and among the inorganic membranematerials, carbon membranes have demonstrated superior gas separation performance. Carbon membranes can be categorized into molecular sieve and selective adsorption types, each suitable for separating different gas molecules. Additionally, research indicates that zeolitic imidazolate frameworks (ZIFs) within the metal-organic framework (MOFs) class hold promise as potential porous fillers for gas separation applications. A composite technique is proposed by combining materials such as polyetherimide (PEI), ZIFs, and carbon molecular sieve (CMS) to enhance the performance of membranes. The experimental investigation focuses on ZIF-67-Membrane with varying deposition times and subsequent PEI modification to improve its separation capabilities. The modified and carbonized membranesexhibit enhanced gas adsorption capacity and selectivity. The results show that the ZIF-67/CMS-Membrane with a deposition time of 2 days exhibits good diffusion selectivity for nitrogen gas, with H2/CH4, N2/CO2, N2/CO, and N2/CH4values of 3.54, 1.52, 2.04, and 6.80, respectively, indicating a certain level of nitrogen gas separation performance. Using ZIF-67 as an inorganic surface modifier and employing post-synthesis methods contribute to forming a thin, well-crosslinked, and stable ZIF-67-Membrane, suggesting its potential for practical gas separation applications.