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Beads-on-string structural nanofiber membrane with ultrahigh flux for membrane distillation.
- Source :
-
Separation & Purification Technology . Apr2024, Vol. 334, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- • 1. The PH/CS layer was constructed on the membrane surface by incorporating CS nanoparticles. • 2. PH/CS layer with beads-on-string structure reduced temperature polarization in MD membrane. • 3. The water flux of ENMs was increased 2.4 times after incorporating CS in PH nanofiber. • 4. PH/CS composite ENMs exhibited good long-term stability of over 5100 min. Membrane distillation (MD) is a promising technology among various desalination processes. However, the membrane used in MD is still problematic due to its low permeability and tendency to become wet. In this work, we fabricated a novel electrospun nanofiber membrane (ENM) with micro-nano structures resembling beads on a string to enhance water flux and anti-wetting properties in MD desalination. The composite ENM consists of a heat-conducting top layer made of polyvinylidene fluoride co-hexafluoropropylene (PH) nanofibers embedded with carbon sphere (CS) nanoparticles and a heat-insulating support layer made of pH nanofibers. The PH/CS top layer with beads-on-string micro-nano structures can not only provide a rough surface to elevate anti-wetting property of the membrane, but also create a maximum temperature difference inside the membrane to improve mass transfer of water vapor. The PH/CS composite ENMs acquired the highest water flux of ∼ 71.3 L m−2 h−1 at a temperature difference of 40 °C, and its salt rejection rate for a 3.5 wt% NaCl solution was higher than 99.9% in direct contact membrane distillation. Meanwhile, the composite ENM exhibited long-term stability of 5100 min. Our work presents a novel composite ENM with great potential for promoting water flux and anti-wetting properties towards MD desalination. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13835866
- Volume :
- 334
- Database :
- Academic Search Index
- Journal :
- Separation & Purification Technology
- Publication Type :
- Academic Journal
- Accession number :
- 174950296
- Full Text :
- https://doi.org/10.1016/j.seppur.2023.125999