Ultrasonic-assisted fabrication of high flux T-type zeolite membranes on alumina hollow fibers
| Autor: | Zhengbao Wang, Nanke Ma, Rui Wang, Yushan Yan |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Aqueous solution
Materials science Chromatography Filtration and Separation 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry 0104 chemical sciences Membrane Chemical engineering Phase (matter) Hydrothermal synthesis General Materials Science Ultrasonic sensor Fiber Physical and Theoretical Chemistry 0210 nano-technology Zeolite Porosity |
| Zdroj: | Journal of Membrane Science. 548:676-684 |
| ISSN: | 0376-7388 |
| DOI: | 10.1016/j.memsci.2017.10.047 |
| Popis: | Ultrasonic-assisted pretreatment prior to hydrothermal synthesis is employed for the first time in the preparation of T-type zeolite membranes on α-Al2O3 hollow fibers by secondary growth. The synthesis time can be shortened from 40 h to 24 h with only 0.5 h ultrasonic pretreatment of the synthesis solution. Elongating ultrasonic treatment time to 1.0 h has no further improvement for the formation of dense membrane. Typically, the pure phase T-type zeolite membrane synthesized in 24 h with 0.5 h ultrasonic pretreatment has a separation factor of > 10,000 and a flux of 12.2 kg m−2 h−1 for 90.0 wt% isopropanol aqueous solution at 75 °C. When the porosity of the hollow fiber support is 68%, the flux is as high as 14.3 kg m−2 h−1, which is the highest flux ever reported. The high flux of the membrane can be mainly ascribed to the special structure and porosity of the α-Al2O3 hollow fiber support. Finally, a mechanism for ultrasonic-assisted membrane preparation is proposed. |
| Databáze: | OpenAIRE |
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