https://scholars.lib.ntu.edu.tw/handle/123456789/65803
標題: | 芯鞘型環境敏感性聚(氮-異丙基丙烯醯胺)/幾丁聚醣之電紡纖維製備及其於重金屬離子吸附應用 Preparation of Enviromentally Sensitive Poly(N- isopropylacrylamide)/Chitosan Fibers via Electrospinning with Core-Sheath Structure and Their Applications on Metal Ion Adsorption |
作者: | 謝得賢 Hsieh, Te-Hsien |
關鍵字: | 同軸靜電紡絲;幾丁聚醣;N-異丙基丙烯醯胺;溫度敏感性;pH 敏感性;金屬離子吸附;吸收劑;co-axial electrospinning;chitosan;N-isopropylacrylamide;thermosensitive;pH-sensitive;metal-ion adsorption;adsorbent | 公開日期: | 2015 | 摘要: | 本研究利用同軸靜電紡絲技術製備具有溫感性/酸鹼性芯鞘複合纖維,內層使用高子為具有溫感性之高分子 Poly(NIPAAm-co-NMA) (PNN) ;外層則有兩種配方:一是幾丁聚醣,另一為幾丁聚醣與 PNN 混摻物。 在本實驗同軸靜電紡絲製程中,內層與外層高分子溶劑均使用重量比為 73/27 之三氟醋酸/二氯甲烷共溶劑。製備出的芯鞘型複合纖維可利用掃描式電子顯微鏡(SEM) 與穿透式電子顯微鏡(TEM) 觀察電紡纖維形態,本研究也以無因次群分析同軸靜電紡絲過程中內外層溶液參數 , 經過分析後可得內層與外層無因次群以及找出可成功紡出雙層纖維區間。 除了探討同軸靜電紡絲參數對於成功與失敗影響外, 後續實驗部分挑選了三種電紡纖維膜經過熱交聯與戊二醛交聯後測試其膨潤率與對於重金屬離子 Cu(II)與 Ag(I)吸附與脫附特性測試。吸附的部分,由於幾丁聚醣在高 pH 下吸附量較大因此環境酸鹼值選擇為 pH4;而環境溫則選擇在 25°C,讓 PNN 為吸水狀態藉此提高吸附量。實驗結果發現當外層為 PNN/幾丁聚醣混摻物時,由於外層具有良好吸水性材料 PNN,可提升纖維膜對重金屬吸附速率以及單位幾丁聚醣吸附重金屬重量,每克膜可吸附約 60 mg Cu(II)與 70 mg Ag(I)。脫附的部分,首先利用幾丁聚醣酸鹼敏感性選擇在 pH 2、25°C 的環境下將重金屬離子脫附;再利用PNN 溫感效應,在 pH 2、70°C 下將水擠出。在此低溫高溫操作下纖維膜脫附效率可達 90 %以上,而當外層為 PNN/幾丁聚醣混摻物時,由於 PNN 吸水造成氫離子與重金屬離子之間較好發生置換反應,因此首次脫附效率較高。最後,交聯後的纖維膜有很好的穩定性且可重複使用,吸附銅離子四次後電紡纖維膜仍可維持銅離子吸附量。 In this research, thermo-responsive and pH-responsive fibers with Core-Sheath structure were fabricated by co-axial electrospinning. The thermo-responsive and thermo-crosslinkable copolymer poly(NIPAAm-co-NMA) (PNN) was fabricated as the core material. Chitosan and PNN/Chitosan blend were chosen as sheath material. We used trifluoroacetic acid (TFA) / dichloromethane (DCM) = 0.73/0.27 (w/w) as solvent for core and sheath. After fabricating core-sheath fibers, we used scanning electron microscope (SEM) and transmitting electron microscope (TEM) to observe the morphology. Dimensional analysis was studied to find out suitable electrospinning parameters for coaxial electrospinning. The NMA provided the function of thermal crosslinking of the nanofibrous mats, and then glutaraldehyde was used as a secondary crosslinking agent to crosslink chitosan. The swelling ratio and gel fraction of the core/sheath fibrous mats were measured. When sheath was PNN/Chitosan blend, its could improve adsorption rate and adsorption amount per weight of chitosan. The reversible adsorption of chitosan was in cooperation with poly(NIPAAm-coNMA) which improved the desorption of Cu(II) and Ag(I) from the fibrous mats. The core/sheath fibrous mats maintained the capacity of Cu(II) adsorption for 4-times regeneration. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/271896 | Rights: | 論文公開時間: 2020/8/10 論文使用權限: 同意有償授權(權利金給回饋學校) |
顯示於: | 化學工程學系 |
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ntu-104-R02524001-1.pdf | 23.54 kB | Adobe PDF | 檢視/開啟 |
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