碩士 / 國立臺灣科技大學 / 材料科學與工程系 / 99 / The current research and application of electrospinning process on the textile engineering, biomedical engineering, tissue engineering, environment engineering. For the past few years, some research teams have been use the electrospun membrane for the liquid filtration application.
In this study, two composite nanofibrous membranes of PVDF and PVDF-HFP prepared by electrospinning process were employed in a direct contact membrane distillation (DCMD) system. The nanofiber membrane combined the high tenacity spunbond nonwoven. And this membrane was electrospun nanofiber nonwoven membrane and spunbond combined to form a sandwich structure of the folder into a SES (Spunbon-Electrospun-Sponbond) composite nanofiber membrane. It reach high porosity, low pore sizes, nanofiber grade, high specific surface area, and high hydrophobic composite membrane for the direct contact membrane distillation system.
By SEM observations, porosity analyzer technique and contact angle measurement, it indicated that the nanofibrous membrane of the average fiber diameter of 170nm and maximum pore diameters distribution of 0.3μm is the best membrane applied in DCMD system.
During 12 hours, experiment with the following conditions: Bulk temperature difference of 55°C , and both the two side flow rate of 210 mL/min, it resulted in that the permeate flux of PVDF-HFP composite membrane is higher 4.28kg/m2hr than PTFE commercial membrane. From this 12 hours experiment, the salt rejection of PVDF-HFP (99.9901%) was better than that of PVDF composite membrane (99.9888%) and was the same as that of PTFE commercial membrane (99.9951%). Consequently, the PVDF-HFP composite nanofibrous membrane is significantly increase the permeation flux and salt rejection than the PVDF composite nanofibrous membrane in the DCMD system.
| Identifer | oai:union.ndltd.org:TW/099NTUS5159042 |
| Date | January 2011 |
| Creators | Jyun-Han Shih, 施鈞瀚 |
| Contributors | Ching-Iuan Su, 蘇清淵 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 109 |
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