臺灣博碩士論文加值系統

本研究以批次吸附實驗方法，探討苯之純溶劑與水溶液，於聚二甲基矽氧烷(Polydimethylsiloxane, PDMS)薄膜之擴散與吸附現象，及其吸附動力學模式，並建立Liquid-Film Model解釋水溶液中苯進入PDMS薄膜內之質傳機制。
本研究結果發現，Freundlich及Langmuir模式較符合水溶液中，溫度25℃下苯對於PDMS之吸附現象；苯於PDMS中擴散於研究中是屬於Non-Fickian diffusion中的persudo-Fickian模式，以Curve fitting方法得到之擴散係數，較符合吸附試驗之模擬結果；苯水溶液在PDMS薄膜之擴散係數，隨水溶液濃度增加而後下降之趨勢，此現象可能受到水合物之影響；PDMS薄膜之溶解度參數，隨水溶液濃度增加而降低，非常近似Linear partition。
最後，本研究所建立之Liquid-Film Model，可適當描述水溶液中，苯在PDMS薄膜表面之質傳現象，未來可應用於SPME及廢水回收再利用技術之發展。

In this study, a batch sorption method was examined for the sorption, diffusion, and the sorption dynamic of benzene in the pure solvent and the aqueous solution by Polydimethylsiloxane (PDMS) membranes. Liquid-Film Model was developed to explain the mass transfer mechanism of benzene in the aqueous solution by PDMS membranes.
The results, Freundlich and Langmuir were more adapted to describe isotherm adsorption of PDMS in the benzene aqueous solution at 25℃. In dynamic, the diffusion of benzene in PDMS membranes was the persudo-Fickian model of the Non-Fickian diffusion. The diffusion coefficients were gained by curve fitting that was more adaptive for simulation results. In the aqueous solution, the diffusion coefficients of benzene were increased with increasing concentrations and then decreased. This situation may be influenced by hydrate. The solubility coefficients of PDMS membranes were decreased with increasing concentrations and they were very close to linear partition.
Finally, the mass transfer mechanism of benzene by PDMS membranes was appropriately described in the aqueous solution by Liquid-Film Model in this study. It could be a possible method to SPME and waste water reuse technique in the future.

摘要 Ⅰ
目錄 Ⅲ
表目錄 Ⅵ
圖目錄 Ⅶ
第一章 前言
1.1研究背景 1
1.2研究目的 2
第二章 文獻探討
2.1吸附理論 4
2.2等溫吸附模式 7
2.3影響吸附之因素 11
2.4溶劑在PDMS中之擴散 12
2.5有機溶劑水溶液在PDMS膜中之擴散 14
2.6有機溶劑在PDMS中之溶解度 15
2.7吸附動力學 16
2.8 PDMS之應用 18
第三章 材料與方法
3.1實驗材料 19
3.2實驗設備 20
3.3製備片狀PDMS膜 21
3.4溶劑浸入實驗 23
3.5水溶液實驗 24
3.6拉西環吸附實驗 28
第四章 結果與討論
4.1容器吸附空白實驗 32
4.2 PDMS薄膜之厚度變化 33
4.3 PDMS等溫吸附模式 34
4.4純溶劑之擴散係數 35
4.5水溶液於PDMS之擴散係數 40
4.6有機溶劑水溶液之萃取應用 46
第五章 結論與建議
5.1結論 50
5.2未來研究方向 51
參考文獻 52

附錄一 符號表 54
附錄二 浸入實驗PDMS之重量變化 56
附錄三 片狀薄膜吸附實驗檢量線 57
附錄四 有機溶劑之片狀薄膜吸附實驗水中濃度 58
附錄五 拉西環萃取吸附實驗之檢量線 64
附錄六 拉西環萃取吸附實驗水中濃度變化 65

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