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標題: | 以聚酰亞胺為基材之界面聚合複合膜製備及其於有機溶劑奈米過濾之應用 Interfacial polymerized ODPA-TFMB polyimide-based thin film composite membranes for organic solvent nanofiltration (OSN) |
作者: | Jia-Ying Wu 吳佳穎 |
指導教授: | 童國倫(Kuo-Lun Tung) |
關鍵字: | 有機溶劑奈米過濾,界面聚合法,氧化石墨烯,相轉換法,複合膜, Organic solvent nanofiltration,thin film composite membrane,graphene oxide incorporation,polyimide, |
出版年 : | 2016 |
學位: | 碩士 |
摘要: | 有機溶劑奈米過濾(Organic Solvent nanofiltation, OSN)利用薄膜技術,可以去除分子量200-1000 Da的有機物,只讓分子小的溶劑通過薄膜。相較於傳統分離程序如蒸餾、吸收、層析來的更節能、操作上更安全。複合膜(Thin film composite membrane, TFC)常用來製備有機溶劑奈米過濾薄膜,由於其含有超薄的選擇層,選擇層下方為多孔支撐層,提供薄膜機械強度。相較於傳統的非對稱膜(integrally skinned asymmetric, ISA),TFC膜的選擇層來的更薄,因此通量上來得更高。
本研究利用相轉換法及靜電紡絲法在不織布上製備耐溶劑的聚酰亞胺(PI)多孔層,之後利用介面聚合技術,製備緻密聚酰胺(Polyamide)選擇層,形成TFC薄膜,分析其表面微觀結構、表面官能基、接觸角等薄膜性質,應用到OSN上,結果發現其薄膜在具有穩定的溶劑通量與良好的溶質阻擋率,其分子截流量約為520 g/mol,在六小時長時間的操作下也不會被乙醇膨潤(swell),是相當良好的有機溶劑奈米過濾材料。 此外研究不同基材(靜電紡絲與PVP添加劑)對多孔基材內部構造與表面的影響,以及其形成的TFC膜對OSN通量與阻擋率的影響。另外,添加二維片狀氧化石墨烯(graphene oxide, GO)到緻密聚酰胺層,形成奈米複合薄膜(Thin film nanocomposite membrane, TFN),結果發現其氧化石墨烯層狀排列結構能在選擇層中形成特殊的通道障礙,阻擋溶質通過並提升溶質之阻擋率。 Organic solvent nanofiltration (OSN) is a novel technique, which can separate molecular (between 200 and 1000 Da) in solvents. Compared to conventional technique, such as distillation, extraction, chromatography, OSN is much more energy efficient, environmentally friendly and safe. Because of their specific characteristics (very thin top layers), the thin film composite (TFC) membrane have good value for OSN application. TFC membrane consists of a very thin, selective layer on top of a porous ultrafiltration (UF) support. In this study, the thin film composite membranes were prepared via interfacial polymerization on PI supports. The supports were prepared via phase inversion and electrospinning. From SEM image, the support via phase inversion showed finger-like structure and pore around 10 nm. After interfacial polymerization, dense defect free polyamide layer can be observed on top of support. The membranes were characterized by SEM, FTIR and contact angle. The OSN performances were evaluated using ethanol as solvent and four dyes as solutes. The flux of ethanol is 0.3 L/m2h bar. The MWCO of TFC membranes was around 520 g/mol, proving its OSN ability. Besides, the operation stability of TFC membranes were evaluated. Despite a slight drop of flux, the membrane exhibited potential long-term stability for OSN application. The support via electrospinning and support with PVP were also compared with original support by their morphology comparison and flux and rejection ability after interfacial polymerization. Besides, the GO sheets were incorporated into thin film of TFC membranes in this study. The GO sheets acted as good filler in polymer matrix and acted as molecular barriers and thereby suppressed the transport of solutes. The solute rejection was increased by GO incorporation |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/49674 |
DOI: | 10.6342/NTU201602287 |
全文授權: | 有償授權 |
顯示於系所單位: | 化學工程學系 |
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