Chemical and surface engineered superhydrophobic patterned membrane with enhanced wetting and fouling resistance for improved membrane distillation performance
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- Chemical and surface engineered superhydrophobic patterned membrane with enhanced wetting and fouling resistance for improved membrane distillation performance
- Lee, Hyung Kae; Ray, Saikat Sinha; Thanh Huyen, Dao Thi; Kang, Wooseok; Kwon, Young-Nam
- Issue Date
- Elsevier BV
- JOURNAL OF MEMBRANE SCIENCE, v.629, pp.119280
- Application of membrane distillation (MD) is still in its emerging stage due to membrane wetting and fouling issues. In this study, an anti-wetting and anti-fouling superhydrophobic patterned membrane was prepared utilizing patterned templet surface and subsequent chemical modifications with fluorine-based polymer. A uniform patterned polyvinylidene fluoride-co-chlorotrifluoroethylene (PVDF-CTFE) membrane was prepared using a template having a specific surface structure. It was found that the patterned membrane with a hierarchical microstructure was more hydrophobic than that with a flat surface. Long-term performance of the patterned membrane was determined through direct contact membrane distillation (DCMD). Results showed that such patterned membrane exhibited wetting resistance for a longer time compared to a pristine membrane. However, the patterned membrane showed rapid flux decline during a fouling test due to deposition of foulants such as humic acid (HA), alginate acid (AA), and bovine serum albumin (BSA). To overcome the fouling issue, a patterned membrane was chemically modified with 1H, 1H-perfluorooctyl methacrylate (FOMA) known to possess a low surface energy. After surface modification with FOMA, the superhydrophobic patterned membrane showed good stability in terms of water flux and salt rejection for more than 7 days in DCMD without wetting or fouling issue. Results of this study indicates the capability of a superhydrophobic patterned MD membrane for generating maximum water flux with excellent anti-fouling and wetting resistance properties.
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