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    Effects of surface coating process conditions on the water permeation and salt rejection properties of composite polyamide reverse osmosis membranes

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    Type
    Article
    Authors
    Louie, Jennifer Sarah
    Pinnau, Ingo cc
    Reinhard, Martin
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Chemical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2011-02
    Permanent link to this record
    http://hdl.handle.net/10754/561577
    
    Metadata
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    Abstract
    The application of polymer surface coatings to improve the fouling resistance of reverse osmosis membranes tends to increase flow resistance across the membrane. This paper presents a systematic analysis on how membrane properties and performance are impacted by the coating process steps, and investigates how such effects could contribute to lower water flux. On one hand, simply pre-soaking dry aromatic polyamide composite membranes in aliphatic alcohols results in a significant increase in water flux, which is attributed to wetting of pores in the selective polyamide layer and to changes in the polymer structure. This flux increase was not readily reversible, based on a 300-h water permeation test. Conversely, drying a wetted membrane led to a decrease in water flux, which we hypothesize is caused by increased interchain hydrogen-bonding in the selective layer. This drop in water flux was not permanent; higher flux was observed if the same wetted/dried membrane was then re-soaked in ethanol prior to the water permeation experiment. An ethanol pre-soaking step also increased water flux of a PEBAX-coated membrane by nearly 70%. In contrast to the reduction in water flux caused by the specific treatment sequence of ethanol-swelling followed by drying, this same sequence actually increased gas transport. The eight- to ten-fold increase in Knudsen diffusion-based gas permeance after this pre-treatment was attributed to an increase in the number or size of membrane defects. © 2010 Elsevier B.V.
    Citation
    Louie, J. S., Pinnau, I., & Reinhard, M. (2011). Effects of surface coating process conditions on the water permeation and salt rejection properties of composite polyamide reverse osmosis membranes. Journal of Membrane Science, 367(1-2), 249–255. doi:10.1016/j.memsci.2010.10.067
    Sponsors
    This work was funded by the Santa Clara Valley Water District (Agreement A2727A), the Metropolitan Water District (Agreement 41808), the California Department of Water Resources, the WateReuse Foundation (WRF-06-020) and Singapore Economic Development Board. Membranes used for this study were generously donated by Hydranautics (Oceanside, CA). Membrane Technology and Research, Inc. is gratefully acknowledged for providing water and gas permeation equipment.
    Publisher
    Elsevier BV
    Journal
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2010.10.067
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.memsci.2010.10.067
    Scopus Count
    Collections
    Articles; Advanced Membranes and Porous Materials Research Center; Physical Science and Engineering (PSE) Division; Chemical Engineering Program

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