Journal
ADVANCED MATERIALS INTERFACES
Volume 9, Issue 23, Pages -Publisher
WILEY
DOI: 10.1002/admi.202200786
Keywords
CO; (2) stripping; electrospinning; membrane contactor; membrane distillation
Funding
- Australian Research Council Discovery Projects Scheme [DP190102253]
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Polytetrafluoroethylene (PTFE) nanofiber membranes with novel crosshatched structures have been developed and applied for water desalination and CO2 separation. The crosshatched structure enables rapid gas and vapor transport due to low tortuosity and high porosity. The mass transfer in both membrane distillation (MD) and CO2 stripping is greatly improved with these novel membranes.
Polytetrafluoroethylene (PTFE) nanofiber membranes with novel crosshatched structures are developed and applied to both water desalination by direct contact membrane distillation (MD) and CO2 separation by membrane gas absorption. Crosshatched structures are produced from a PTFE-poly(ethylene oxide)(PEO) emulsion by depositing alternating layers of aligned fibers oriented in perpendicular directions. This is followed by sintering to remove the PEO and to stabilize the structure. The crosshatched structure allows for rapid gas and vapor transport due to the low tortuosity and high porosity, leading to fast and effective separation. PTFE nanofiber membranes with these novel structures are ideal for membrane CO2 stripping as this polymer is inherently strong and very hydrophobic. The mass transfer in both MD and CO2 stripping is greatly improved in the crosshatched nanofibers (CNF) as well as in composite membranes with microparticles (CNF-MP), as compared with conventional random nanofibers. The membranes exhibit a MD flux up to 98.5 +/- 1.2 kg m(-2)h(-1), significantly greater than a standard PTFE membrane with asymmetric morphology, when tested with a 3.5 wt% sodium chloride feed solution at 80 degrees C in direct contact with water at 20 degrees C.
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