以鎳反蛋白石結構平台開發新型乙醇水溶液純化之分離膜

Abstract

本研究成功地以簡單快速的方法製備具規則蜂窩狀結構的金屬鎳反蛋白石薄膜。從聚苯乙烯微球的合成、電泳自組裝聚苯乙烯微球到電鍍金屬鎳，以及移除聚苯乙烯微球等步驟皆可穩定製備。 觀察利用重力過濾法以反蛋白石薄膜做長時間分離乙醇水溶液的實驗，結果顯示隨著實驗時間增加，進料端與滲透端的乙醇水溶液濃度會跟著提升，而進料端與滲透端的濃度差則會維持穩定，顯示反蛋白石薄膜適合作為分離乙醇水溶液的薄膜。 表面經過疏水處理的反蛋白石薄膜會提高進料端與滲透端濃度差，但不影響流通量而提高了整體的分離效果。此外，當增加乙醇與水分子移動的路徑差和薄膜的表面疏水改質皆可提升乙醇水溶液分離，其分離現象與液相層析儀有類似的效果。此外，以反蛋白石薄膜做為分離膜來分離甲醇、乙醇、丙醇及異丙醇等水溶液，皆發現有分離互溶溶液的效果。

We have developed a separation membrane to separate the water from a mixture of ethanol and water by using a free-standing nickel inverse opaline porous structure. This membrane is prepared via an electrophoresis process of polystyrene (PS) microspheres to produce a defect-less colloidal crystals, followed by an electroplating of nickel into the interstitial voids among the PS microspheres, and the removal of PS microspheres by chemical dissolution. The separation performance of the resulting membrane show that the ethanol concentrations at both the feed side and permeate side increase with the separation time but their concentration difference remains unchanged. We also observe that the membrane with a surface hydrophobic treatment can enhance the concentration difference between the feed side and the permeate side but the exact flux amount is not varied. Increasing the path difference of the ethanol and water molecules in the separation membrane or changing the surface properties of the membrane can improve the separation performance. We recognize that the operation principle for the separation membrane is similar to that in the liquid chromatography.