碩士 / 嘉南藥理科技大學 / 環境工程與科學系暨研究所 / 98 / Membrane distillation (MD) is a relatively new separation process which is being investigated worldwide as a low cost, energy saving alternative to other conventional separation processes. Plasma-modified polytetrafluoroethylene (PTFE) membranes for use in membrane distillation were prepared with composite PTFE membranes. The composite membrane consisted of a porous woven support and a dense PTFE layer. The membranes were characterized using contact angle measurement. Finally, the plasma-modified membranes were tested for their performance in the process of desalination by means of the air gap membrane distillation (AGMD) and direct contact membrane distillation (DCMD). It was found that the plasma treatment strongly affected the surface hydrophilicity of the modified membranes and thus enhanced their desalination performance. It was also found that prolonging the plasma treatment time and increasing the plasma power significantly decreased the water contact angle and significantly changed the surface morphology of the modified membranes. Furthermore, the plasma treatment only slightly changed the roughness and surface porosity. Such changes in the surface’s morphology and polarity enhanced the hydrophilicity of the modified membranes and then significantly improved the permeation flux but expectedly decreased the salt rejection.
| Identifer | oai:union.ndltd.org:TW/098CNUP5515019 |
| Date | January 2010 |
| Creators | Kuan-wei Huang, 黃冠偉 |
| Contributors | Cheng-Lee Lai, 賴振立 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 145 |
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