以金屬有機骨架薄膜吸附器去除染劑

Abstract

這篇論文致力於將金屬有機骨架材料製成薄膜吸附器並應用於水處理，我們選用的金屬有機骨架材料分別是ZIF-8和ZIF-L，將他們分別成膜於α-氧化鋁基材，並嘗試吸附孟加拉玫瑰紅溶液(一種粉紅色染劑)。我們的研究發現，孟加拉玫瑰紅對ZIF-L的外表面有很好的親和性，另外也觀察到結晶顆粒愈小(總表面積越大)吸附效果會越好，而在ZIF-L薄膜合成過程中添加介面活性劑溴化十六烷基三甲銨可以有效地縮小ZIF-L的顆粒大小，並讓α-氧化鋁基材內部填滿更多的ZIF-L顆粒。從實驗結果得知，加入溴化十六烷基三甲銨濃度最高的ZIF-L薄膜擁有最好的吸附效果，另外值得一提的是，ZIF-L薄膜的permeance (10000 L/m2/bar/h) 也遠高於目前文獻提出的薄膜吸附器。

We investigate a novel membrane adsorber comprising metal-organic frameworks (MOFs) for water treatment. Two types of MOF (ZIF-8 and ZIF-L) were grown within a porous α-alumina support to form a membrane for the adsorption of the die molecule, Rose Bengal, in aqueous phase. The external surface of the ZIF-L was shown to possess a strong affinity for Rose Bengal. We also observed that small crystals (with large external surface area) are beneficial to adsorption. The surfactant CTAB was used in the synthesis of ZIF-L-based membrane adsorber in order to reduce the size of ZIF-L particles and increase the loading of ZIF-L within the membrane. The membrane adsorber with the highest concentration of CTAB achieved the highest dynamic adsorption capacity. ZIF-L-based membrane adsorbers exhibited water permeance (10000 L/m2/bar/h) far exceeding that of most existing membrane adsorbers.