Desalination by Membrane Distillation using Electrospun Polyamide Fiber Membranes with Surface Fluorination by Chemical Vapor Deposition
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am-2015-01197p-ms.pdf
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1.42 MB
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Checksum (MD5)
821071137861d0d7b14c33c879632225
Author(s)
Guo, Fei
Servi, Amelia T
Liu, Andong
Gleason, Karen K
Rutledge, Gregory C
Date Issued
April 2015
Journal
ACS Applied Materials & Interfaces
Publisher
American Chemical Society (ACS)
Citation
Guo, Fei, et al. “Desalination by Membrane Distillation Using Electrospun Polyamide Fiber Membranes with Surface Fluorination by Chemical Vapor Deposition.” ACS Applied Materials & Interfaces 7, 15 (April 2015): 8225–8232 © 2015 American Chemical Society
Version
Author's final manuscript
Abstract
Fibrous membranes of poly(trimethyl hexamethylene terephthalamide) (PA6(3)T) were fabricated by electrospinning and rendered hydrophobic by applying a conformal coating of poly(1H,1H,2H,2H-perfluorodecyl acrylate) (PPFDA) using initiated chemical vapor deposition (iCVD). A set of iCVD-treated electrospun PA6(3)T fiber membranes with fiber diameters ranging from 0.25 to 1.8 μm were tested for desalination using the air gap membrane distillation configuration. Permeate fluxes of 2–11 kg/m²/h were observed for temperature differentials of 20–45 °C between the feed stream and condenser plate, with rejections in excess of 99.98%. The liquid entry pressure was observed to increase dramatically, from 15 to 373 kPa with reduction in fiber diameter. Contrary to expectation, for a given feed temperature the permeate flux was observed to increase for membranes of decreasing fiber diameter. The results for permeate flux and salt rejection show that it is possible to construct membranes for membrane distillation even from intrinsically hydrophilic materials after surface modification by iCVD and that the fiber diameter is shown to play an important role on the membrane distillation performance in terms of permeate flux, salt rejection, and liquid entry pressure.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1021/acsami.5b01197
