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標題: | 使用免乾燥混合法結合沸石咪唑酯骨架-8奈米粒子與Pebax® MH 2030 之高效有機無機複合薄膜在二氧化碳/氮氣分離上的應用 A Drying-Free Mixing Process of Zeolitic Imidazolate Frameworks-8 (ZIF-8) Nanoparticles and Pebax® MH 2030 for Fabricating Highly Efficient Mixed-Matrix Membrane (MMM) in CO2/N2 Separation |
作者: | 陸建宇 Jian-Yu Lu |
指導教授: | 吳嘉文 Kevin C.-W. Wu |
關鍵字: | 沸石咪唑酯骨架,奈米粒子,有機無機複合薄膜,免乾燥混合法,Pebax® MH 2030,二氧化碳/氮氣分離, ZIF-8,Nanoparticles,MMM,Drying-Free Mixing,Pebax® MH 2030,CO2/N2 separations, |
出版年 : | 2023 |
學位: | 碩士 |
摘要: | 自19世紀工業革命以來,大氣中CO2濃度持續上升,造成顯著的全球氣候變遷。因此從大氣中捕捉CO2是目前非常重要的課題。在此研究中,我們使用薄膜分離的方式來分離空氣中的CO2,並利用免乾燥法混合高分子Pebax和金屬有機框架(MOFs) ZIF-8,形成混合基質薄膜(ZIF-8/Pebax® MH 2030 MMMs),設法提升高分子薄膜的氣體分離效能。
在此研究中,我們利用FE-SEM和EDX觀察到免乾燥混合法可以有效地提升ZIF-8在高分子中的分散性,有效避免ZIF-8的聚集。此外,透過DSC分析,我們利用Tg變化觀察到ZIF-8和Pebax之間的親和性會使部分的高分子產生鏈剛硬化(Polymer chain rigidification)的現象。 我們對ZIF-8/Pebax® MH 2030 MMMs進行氣體分離效能的測試。實驗結果顯示,在單一氣體的環境中,當ZIF-8的添加量為5 wt%時,氣體通透率從115 barrer提升至140 barrer,同時CO2/N2選擇率從26提升至35。除此之外,我們還模擬了大氣環境來捕捉CO2。在ZIF-8的添加量同樣為5 wt%時,氣體通透率從460 barrer提升至500 barrer ,CO2/N2選擇率從19提升至69。相較於未添加ZIF-8的Pebax,選擇率增加了263%。此研究不僅發現利用免乾燥法可以有效的改善ZIF-8在Pebax中的分散性,更重要的是,參雜適當比例的ZIF-8可以有效的提升Pebax薄膜在大氣環境下的氣體分離效能。 Significant global climate change has resulted from the continuous increase in atmospheric CO2 concentration since the Industrial Revolution in the 19th century. Therefore, capturing CO2 from the atmosphere is currently a crucial issue. In this study, we used the mixed matrix membranes (MMMs) for CO2/N2 separation. We incorporated the metal-organic frameworks (MOFs) ZIF-8 into Pebax® MH 2030 to form the mixed matrix membrane (ZIF-8/Pebax® MH 2030 MMMs) by the drying-free method. In this research, we use FE-SEM and EDX analysis to observe that the drying-free method can effectively improve the dispersion of ZIF-8 in the polymer, effectively avoiding ZIF-8 aggregation. Additionally, based on DSC analysis, we found that the polymer chain rigidification phenomenon will increase glass transition temperature (Tg), which is due to the affinity between ZIF-8 and Pebax® MH 2030. We measured the gas separation performance of the ZIF-8/Pebax® MH 2030 MMMs. In a single gas environment case, the 5 wt% loading ZIF-8 MMMs can get higher permeability (140 barrer) than the pure Pebax® MH 2030 (115 barrer), as well as the CO2/N2 selectivity (increased from 26 to 35). Furthermore, we simulated CO2 capture in the atmospheric environment to test the gas separation performance. Adding 5 wt% ZIF-8 into Pebax® MH 2030 can increase gas permeability from 460 barrer to 500 barrer, and the CO2/N2 selectivity increased from 19 to 69 (263% increased). This study shows that the drying-free method effectively improves the dispersion of ZIF-8 in Pebax® MH 2030 . More importantly, the incorporation of an appropriate proportion of ZIF-8 significantly enhances the direct air capture (DAC) performance of Pebax® MH 2030 membranes in an atmospheric environment. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/88139 |
DOI: | 10.6342/NTU202301497 |
全文授權: | 未授權 |
顯示於系所單位: | 化學工程學系 |
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