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| 標題: | Physicochemical effects of hydrolyzed asymmetric polyacrylonitrile membrane microstructure on dehydrating butanol |
| 作者: | Lai, Cheng-Lee
Chao, Wei-Chi
Hung, Wei-Song
An, Quanfu
De Guzman, Manuel
Hu, Chien-Chieh
Lee, Kueir-Rarn |
| 貢獻者: | 環境工程與科學系 |
| 關鍵字: | Polyacrylonarile
Hydrolysis
Free volume
Positron annihilation lifetime |
| 日期: | 2015-09 |
| 上傳時間: | 2016-04-19 19:07:02 (UTC+8) |
| 出版者: | Elsevier Science Bv |
| 摘要: | Traditionally, polyacrylonitrile (PAN) is coated with a selective layer to tailor it for dehydrating butanel by pervaporation. But we hydrolyzed PAN with sodium hydroxide for such a purpose. Fourier transform infrared and X-ray photoelectron spectroscopy indicated that PAN's CN group was hydrolyzed to CONH2, which was further converted to COOH. As a result, the hydrolyzed PAN (HPAN) was made more hydrophilic, as evidenced from water contact angle data. CONH2 and COOH formed hydrogen bonds between them, causing molecular chains to rearrange (according to X-ray diffraction) and pores to shrink (shown by scanning electron microscopy). Positron annihilation lifetime spectroscopy revealed that hydrolysis led to free volume radius decrease; however, prolonged hydrolysis caused breakage of molecular chains. The HPAN produced after 4 h hydrolysis exhibited narrow free volume distribution and delivered exceptional performance (water concentration in permeate = 99.1 wt%; permeation flux = 2.03 kg/m(2)h). (C) 2015 Elsevier B.V. All rights reserved. |
| 關聯: | Journal of Membrane Science, v.490, pp.275-281 |
| 顯示於類別: | [環境工程與科學系(所)] 期刊論文
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