Pebax/GO/PDMS/PSf/PET混合基質複合薄膜應用於二氧化碳捕捉之研究

Pebax/GO/PDMS/PSf/PET mixed matrix composite membrane for CO2 capture

葉信宏(Hsin-Hung Yeh)

指導教授 ： 李魁然 ； 胡蒨傑

中原大學/工學院/化學工程研究所/碩士(2019年)

https://doi.org/10.6840/cycu201900561

摘要

溫室氣體排放使全球暖化加劇，如何降低溫室氣體排放，解決全球暖化問題成為維持地球永續發展最重要的課題。與傳統的氣體分離程序相比，薄膜氣體分離是最具能源與成本效益的技術。本研究以多孔的PSf/PET複合膜作為基材膜，使用聚二甲基矽氧烷作為中間層，並以UV/O3改善其親水性後，接著將共聚物Pebax 1657塗佈在最上層作為選擇層，探討Pebax濃度、乾燥溫度以及熱處理時間對於Pebax/PDMS/PSf/PET複合薄膜氣體分離效能的影響。在操作條件為35℃與1bar時，Pebax/PDMS/PSf/PET複合薄膜其CO2滲透率為121.12 GPU，CO2/N2選擇性為22.65。為了提升氣體分離效能，將氧化石墨烯添加於Pebax中，製備Pebax/GO/PDMS/PSf/PET混合基質複合薄膜。研究發現，GO添加量為1wt%時具最佳氣體分離效能，在操作條件為35℃與1bar時，其CO2滲透率為54.50 GPU，CO2/N2選擇性為36.92。此外，透過3-氨基丙基三乙氧基矽烷 (APTES) 對氧化石墨烯進行改質，探討不同改質溫度和APTES用量對氣體分離效能的影響。研究發現，氨基矽烷化氧化石墨烯 (aGO) 對CO2吸附能力增強，導致薄膜氣體滲透性與選擇性同時上升。在操作條件為35℃與7bar時，添加量為1wt％aGO_70-5 (反應溫度為70℃，APTES量為5mL) 的混合基質複合薄膜呈現出最佳的CO2滲透率為208.92 GPU，CO2/N2選擇性為40.04。

關鍵字

二氧化碳捕捉 ； 混合基質薄膜 ； 氧化石墨烯改質

並列摘要

Greenhouse gas emissions have intensified global warming. Reducing greenhouse gas emissions and solving global warming problems has become the most important issue to sustain the sustainable development of the earth. Membranes separation is the most energy and cost-effective technology compared to traditional gas separation process. In this study, porous PSf/PET membrane was used as a substrate and poly(dimethylsiloxane) was used as the gutter layer, after used UV/O3 to improve the hydrophilicity of PDMS layer, Pebax 1657 was coated on top layer as the selective layer, effect of Pebax concentration, drying temperature, heat treatment time on gas separation performance were investigated, it showed the CO2 permeability of 121.12 GPU with CO2/N2 selectivity of 22.65 at 35℃ and 1 bar. In order to improve the gas separation performance, graphene oxide was added to Pebax become the mixed matrix composite membrane, the membrane with 1wt% graphene oxide loading showed the best gas separation performance, it showed the CO2 permeability of 54.50 GPU with CO2/N2 selectivity of 36.92 at 35℃ and 1 bar. Furthermore, (3-Aminopropyl)-triethoxysilane (APTES) was used to functionalized the graphene oxide, effect of functionalized graphene oxide in different modified temperature and APTES amount on gas separation performance were investigated. The stronger CO2 adsorption ability of aminosilane functionalized graphene oxide provides the enhancement of permeability and selectivity. Mixed matrix composite membrane with 1wt% aGO_70-5 (70℃, 5mL) showed the best CO2 permeability of 208.92 GPU with CO2/N2 selectivity of 40.04 at 35℃ and 7 bar.

並列關鍵字

CO2 capture ； Mixed matrix composite membranes ； Functionalized graphene oxide

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