本研究旨在製備一具高通量與高阻鹽性之碳材料複合膜，並將其應用於正向滲透(Forward Osmosis, FO)分離程序，以期提供正滲透薄膜設計新概念。實驗首先探討分子級逐層堆疊法(Molecular layer-by layer, mLBL)的可行性，比較此方法與界面聚合法製備出的聚醯胺(Polyamide, PA)選擇層之形貌與FO效能差異。另一方面，實驗配置多壁奈米碳管混和漿料(Mixed MWCNT, mCNT)，以塗佈方式在不織布上形成碳管層，並在其上塗佈聚丙烯腈(Polyacrylonitrile, PAN)，形成碳管-聚丙烯腈(mCNT-PAN)複合基材膜，最後結合此複合基材膜與mLBL，完成碳複合膜製備。研究內容包含討論碳管層的導入對複合膜效能的影響，同時討論不同PAN塗佈厚度和不同不織布厚度與FO效能間的關係，並於不同提取液濃度下量測其性能。研究結果顯示，以mLBL方式成長PA層的複合膜，具有較平坦與較薄之特性，且FO效能優於界面聚合法形成之複合膜；而碳管層的導入，除了提升基材膜表面粗糙度外，更能讓基材膜呈現清楚的分層結構，有效減緩質傳阻力，提升碳複合膜之FO效能。其中以30 μm不織布搭配30 μm PAN塗佈厚度形成之碳複合膜具有最佳效能，在提取液為1M氯化鈉、進流液為去離子水的FO系統中，具有29.04 LMH的水通量與9.41 gMH的逆溶質擴散值的表現，說明本研究設計的碳複合膜在FO系統中應用深具潛力。

This work proposed a new concept to fabricate carbon materials-based forward osmosis thin-film composite (FO-TFC) membranes with high performance. The molecular layer-by-layer (mLBL) method was used to prepare polyamide (PA) selective layer and its performance was compared with the one formed by the interfacial polymerization (IP) method. On the other hand, mixed MWCNT (mCNT) slurry was fabricated and was cast on nonwoven fabric. Followed by the Polyacrylonitrile (PAN) casting process, mCNT-PAN composite substrate was formed, which was subjected to the mLBL method to obtain the carbon materials-based TFC membrane.
Results showed that PA formed by mLBL has better properties than PA formed by the IP method. Regarding the substrate, with mCNT inserted between nonwoven fabric and PAN, the substrate not only has higher surface roughness but also has a clear layer structure, which was effective in decreasing mass transport resistance and resulted in improving FO performance. The best FO properties were performed by the 30-mCNT-PAN30 substrate cooperated with the mLBL PA process, with water flux 29.04 LMH and reverse salt flux 9.41 gMH. It showed that this novel carbon materials-based TFC membrane has great potential in FO application.

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