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標題: 多孔性PMMA/蒙脫土複合薄膜之製備與吸附應用
Preparation of porous PMMA/montmorillonite membranes for adsorption application
作者: 林叡毅
Lin, Ray-Yi
關鍵字: PMMA/MMT composite membranes
Cationic dye
Adsorption: Desorption
出版社: 化學工程學系所
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摘要: 本研究是利用相轉移法製備三種PMMA/蒙脫土(montmorillonite, MMT)之高分子複合薄膜,實驗前半部份係利用乳化聚合的合成方式先行製備PMMA/Na+-MMT高分子複合材料進而再利用轉移法製備PMMA/Na+-MMT高分子複合膜,後半部份即參照前步驟之實驗方法進而改變使用改質蒙脫土(O-MMT)而製備PMMA/O-MMT高分子複合薄膜。 於薄膜特徵性質上:霍式轉換紅外線光譜(FTIR)可利用其證明蒙脫土存在於複合薄膜之中,藉由熱重量分析儀(TGA)可推算出複合薄膜之蒙脫土含量且進而推算離子交換容量(IEC)隨著蒙脫土添加量而改變,利用接觸角分析儀(contact angle)及含水率(water content)測量本實驗之高分子薄膜之親疏水性,此外寬角度X光繞射分析儀(WAXD)可清楚判別出蒙脫土於薄膜上其層間距的變化,由於本實驗之薄膜將應用於分離流動液體上,因此,也藉由在不同流速下比較其壓力降(pressure drop)的變化,最後,以掃描穿透式電子顯微鏡(FE-SEM)及光學顯微鏡(OM)觀察薄膜表面的特徵型態。 接下來在應用部份即分別利用PMMA/Na+-MMT和PMMA/O-MMT高分子複合薄膜批次吸附陽離子染料(Methyl violet 2B)及酚化合物(p-nitrophenol),利用PMMA/Na+-MMT高分子複合薄膜於批次吸脫附陽離子染料實驗之中發現高分子複合薄膜中蒙脫土含量M/P = 0.5和0.6表現出最佳吸附效果,分別為兩小時內97 % 和95 % 之吸附率(染料初始濃度為0.015 mg/mL),並且選擇1 M KSCN in 80 % 甲醇水溶液(v/v)為最佳之脫附劑,其脫附率均約為92 %,此外利用PMMA/O-MMT高分子複合薄膜批次吸附酚化合物實驗之中發現於高分子複合薄膜中蒙脫土含量M/P = 0.3現出最佳吸附效果,為三十四小時內77 % 之吸附率(酚化合物初始濃度為0.025 mg/mL)且選擇80 % 甲醇水溶液 (v/v)為最佳之脫附劑,其脫附率為97 %。最後進而討論PMMA/MMT高分子複合薄膜於流動循環實驗,本實驗利用一片直徑為47 mm 圓形高分子複合薄膜固定於特定模組中並於流動循環系統中吸附陽離子染料或酚化合物接著利用批次脫附實驗之最佳脫附劑進行流動脫附實驗,重複三次上述之吸脫附流程而討論其薄膜之重複利用性。
In this study, porous PMMA/montmorillonite (MMT) composite membranes were prepared via phase inversion. In the first part, PMMA/Na+-MMT composite materials were synthesized by emulsion polymerization, followed by the preparation of composite membranes. In the second part, organic-modified MMT clays (O-MMT) were employed to prepare for the composite membranes. The membrane properties were characterized: FTIR and thermogravimetric analyses verified the near complete incorporation of MMT in the composite membranes. By measuring the ion-exchange capacity, contact angle, and water content, the hydrophilicity of composite membranes was analyzed. Moreover, the X-ray diffractograms exhibited the change of interlayer spacing of MMT clays in the composite membranes. Membrane morphology was detected by scanning electron microscope and optical microscope. To evaluate their applicabilities, the adsorption performance of these PMMA/MMT membranes was investigated. In the batch experiment with PMMA/Na+-MMT membranes, the best Methyl violet 2B adsorption performance was achieved by the membranes prepared in feed MMT/MMA (M/P) ratios of 0.5 and 0.6, where about 95-97 % dye adsorption (initial dye concentration of 0.015 mg/mL) was attained in 2 h. The optimal desorption solution was 1 M KSCN in 80 % methanol (v/v) and the related desorption percentage was 92 %. In the batch experiment with PMMA/O-MMT membranes, the best p-nitrophenol adsorption performance (initial concentration of 0.025 mg/mL) was obtained by the feed M/P ratio = 0.3, about 77 % p-nitrophenol adsorption in 34 h. The optimal desorption solution was 80 % methanol (v/v) and the related desorption percentage was 97 %. At last, the flow recirculation adsorption experiment with one piece of 47 mm diameter composite membrane was conducted, followed by the desorption experiment using the optimal desorption solution. The membrane regenerability was proved by successfully performing three consecutive cycles.
其他識別: U0005-2605200810065100
Appears in Collections:化學工程學系所



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