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Membrane Water Treatment Volume 13, Number 6, December 2022 , pages 291-301 DOI: https://doi.org/10.12989/mwt.2022.13.6.291 |
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Cement/PVDF hollow-fiber hybrid basement membrane: Preparation, microstructure, and separation application |
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Yabin Zhang, Xiongfei Du and Taotao Zhao
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| Abstract | ||
| In this study, cement/PVDF hollow-fiber hybrid membranes were prepared via a mixed process of diffusion- induced phase separation and hydration. The presence of X-ray diffraction peaks of Ca(OH)2, an AFt phase, an AFm phase, and C-S-H phase confirmed the hydration reaction. Good hydrophilicity was obtained. The cross-sectional and surface morphologies of the hybrid membranes showed that an asymmetric pore structure was formed. Hydration products comprising parallel plates of Ca(OH)2, fibrous ettringite AFt, and granulated particles AFm were obtained gradually. For the hybrid membranes cured for different time, the pore-size distribution was similar but the porosity decreased because of blocking of the hydration products. In addition, the water flux decreased with hydration time, and carbon retention was 90% after 5 h of rejection treatment. Almost all the Zn2+ ions were adsorbed by the hybrid membrane. The above results proved that the obtained membrane could be alternative as basement membrane for separation application. | ||
| Key Words | ||
| adsorption; asymmetric pore structure; basement membrane; cement/PVDF hybrid membrane; rejection | ||
| Address | ||
| Yabin Zhang, Xiongfei Du and Taotao Zhao: State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, 399 Binshuixi Road, Xiqing District, Tianjin 300380, People's Republic of China | ||
