Hierarchically textured superhydrophobic polyvinylidene fluoride membrane fabricated via nanocasting for enhanced membrane distillation performance
| Autor: | Kang Xiao, Hongjie Wang, Chao Xiang, Zhibo Ma, Zhao Fan, Shuai Liang, Xia Huang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Polydimethylsiloxane Mechanical Engineering General Chemical Engineering 02 engineering and technology General Chemistry Surface finish 010501 environmental sciences 021001 nanoscience & nanotechnology Membrane distillation 01 natural sciences Polyvinylidene fluoride Contact angle Biofouling chemistry.chemical_compound Membrane chemistry Chemical engineering General Materials Science Wetting 0210 nano-technology 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Desalination. 443:228-236 |
| ISSN: | 0011-9164 |
| Popis: | The further advance of membrane distillation (MD) is hampered due to inadequate membrane durability challenged by wetting-induced performance deterioration. The current study presents a novel approach to fabrication of superhydrophobic polyvinylidene fluoride (PVDF) membranes via construction of hierarchical textures on membrane surfaces based on a nanocasting strategy. Two types of PVDF membranes with different surface textures were prepared, separately using a stainless-steel mesh (SSM) or its negative polydimethylsiloxane (PDMS) template as a fabrication substrate. The obtained membranes were systematically characterized in terms of membrane morphology, wetting behavior, MD performance, and antifouling performance. Consequently, the PDMS-based membrane obtained a plaited surface texture, resulting in a high static contact angle of ~153° and a high sliding angle of >90°. The resultant parahydrophobic membrane surface resembled a petal surface. The SSM-based membrane obtained a wave-like pattern, resulting in a high static contact angle of ~164° and a low sliding angle of ~6.8°. The resultant superhydrophobic membrane surface resembled a lotus leave surface. Moreover, both membranes achieved higher water flux and enhanced antifouling performance with no significant compromise in salt rejection. Particularly, the SSM-based membrane achieved the highest flux and best antifouling performance, suggesting promising applications in various fields. |
| Databáze: | OpenAIRE |
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