Enhancing the property of composite pervaporation desalination membrane by fabricating a less resistance substrate with porous but skinless surface structure
Desalination, ISSN: 0011-9164, Vol: 525, Page: 115496
2022
- 18Citations
- 7Captures
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Article Description
The fabrication methods for high performance pervaporation (PV) desalination membranes were complicated and difficult to be scaled-up. To address this issue, we developed a composite membrane using a porous polysulfone (PSF) membrane that was prepared by a conventional non-solvent induced phase inversion (NIPS) technology. The key was to design the PSF structure with a skinless, macro-void free and bi-continuous cross-sectional morphology for achieving an ultra-low transport resistance. This was done by incorporating non-solvent additives of polyvinylpyrrolidone (PVP) and propionic acid (PA) into the PSF polymer dope and regulating the temperature of the water coagulant. As a result, the PSF based PV composite membrane exhibited a high-water flux of 124.8 ± 3.2 kg/(m 2 ·h) and a salt rejection of 99.9% when separating a 3.5 wt% NaCl solution at 70 °C. Moreover, a water flux of 71.3 ± 1.8 kg/(m 2 ·h) was achieved for treating a high concentrated NaCl solution of 20 wt%. To our best knowledge, these PV membrane desalination performances overshadowed all reported PV composite membranes using substrates fabricated by the NIPs method. Most importantly, the easy-to-scale-up membrane fabrication method, as well as the excellent PV desalination performance, indicated a great potential for industrial applications.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0011916421005671; http://dx.doi.org/10.1016/j.desal.2021.115496; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85121400205&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0011916421005671; https://dx.doi.org/10.1016/j.desal.2021.115496
Elsevier BV
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