利用支撐式液膜方法選擇性萃取出溶液中鎵離子

Mass Transfer and Selective Separation of Gallium Ions by Using The Supported Liquid Membrane Technique.

廖晏巧(Yan-Ciao Liao)

指導教授 ： 陳慧芬

高雄醫學大學/生命科學院/醫藥暨應用化學系碩士班/碩士(2016年)

摘要

本研究使用中空纖維支撐式液膜(Hollow Fiber Supported Liquid Membrane， HFSLM)方法選擇性萃取回收鎵離子技術。HFSLM由液態的膜相及固態的多孔聚丙烯（Polypropylene，PP）薄膜所組成中空纖維膜組(hollow fiber module)，利用液-液萃取(Liquid- Liquid Extracted, LLE)方式進行實驗，實驗中分別使用不同濃度的二(2-乙基己基)磷酸(Di(2-ethyhexyl)phosphoric acid，D2EHPA)作為萃取劑。將樣品溶液中的待萃取離子從進料相(Feed phase)，萃取至HFSLM有機相中，再反萃取到反萃取相(Strip phase) 2N HCl中，調整樣品溶液於不同pH值和D2EHPA濃度可以有效率地從含砷化鎵溶液中分離出鎵離子。實驗結果顯示控制樣品溶液pH值1和D2EHPA濃度0.74N時萃取率、反萃取率及總回收率皆達到99.9%。實驗證明以HFSLM方法選擇性萃取出溶液中鎵離子，具備高穩定性、高處理效率、萃取速度快、低耗材及較少的溶劑使用的優點，並能夠減少環境汙染，確實有效回收鎵離子的一個新方法。

關鍵字

支撐式液膜 ； 液膜 ； 選擇性萃取 ； 鎵離子

並列摘要

The mass transfer of gallium ion(III) via hollow fiber supported liquid membrane (HFSLM) method was studied. HFSLM is an excellent system for the extraction of metal ions at very low concentration from various solutions. This allows for both simultaneous extraction and stripping of the target ions in one single step. At pH 1.0 using four different concentrations of Di(2-ethyhexyl)phosphoric acid as the extractant and 2N HCl as the stripping solution, optimum extraction and stripping reached over than 99%. We demonstrate that using HFSLM to recovery gallium ion(III) from GaAs sludge is over traditional methods. The advantage of HFSLM includes lower energy consumption, lower capital and operating costs, and less solvent use. It also offers a higher mass transfer rate per unit surface area.

並列關鍵字

Supported Liquid Membrane ； Liquid Membrane ； Selective Separation ； Gallium Ions

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