Recent progress in the applications of layer-by-layer assembly to the preparation of nanostructured ion-rejecting water purification membranes

Oishi Sanyal, Ilsoon Lee

    Research output: Contribution to journalArticle

    • 15 Citations

    Abstract

    Reverse osmosis (RO) and nanofiltration (NF) are the two dominant membrane separation processes responsible for ion rejection. While RO is highly efficient in removal of ions it needs a high operating pressure and offers very low selectivity between ions. Nanofiltration on the other hand has a comparatively low operating pressure and most commercial membranes offer selectivity in terms of ion rejection. However in many nanofiltration operations rejection of monovalent ions is not appreciable. Therefore a high flux high rejection membrane is needed that can be applied to water purification systems. One such alternative is the usage of polyelectrolyte multilayer membranes that are prepared by the deposition of alternately charged polyelectrolytes via layer-by-layer (LbL) assembly method. LbL is one of the most common self-assembly techniques and finds application in various areas. It has a number of tunable parameters like deposition conditions, number of bilayers deposited etc. which can be manipulated as per the type of application. This technique can be applied to make a nanothin membrane skin which gives high rejection and at the same time allow a high water flux across it. Several research groups have applied this highly versatile technique to prepare membranes that can be employed for water purification. Some of these membranes have shown better performance than the commercial nanofiltration and reverse osmosis membranes. These membranes have the potential to be applied to various different aspects of water treatment like water softening, desalination and recovery of certain ions. Besides the conventional method of LbL technique other alternative methods have also been suggested that can make the technique fast, more efficient and thereby make it more commercially acceptable

    Original languageEnglish (US)
    Pages (from-to)2178-2189
    Number of pages12
    JournalJournal of Nanoscience and Nanotechnology
    Volume14
    Issue number3
    DOIs
    StatePublished - Mar 2014

    Profile

    Membranes
    Bronchiolo-Alveolar Adenocarcinoma
    membranes
    Ions
    ions
    Water
    rejection
    Nanofiltration
    Cyanoketone
    water treatment
    Reverse osmosis
    Purification
    reverse osmosis
    Polyelectrolytes
    Fluxes
    Magnesium Deficiency
    Biogenic Amines
    Psychologic Desensitization
    assembly
    selectivity

    Keywords

    • Ion Rejection
    • Layer-By-Layer Assembly
    • Membranes
    • Thin Films.
    • Water Purification

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Chemistry(all)
    • Materials Science(all)
    • Bioengineering
    • Biomedical Engineering

    Cite this

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    abstract = "Reverse osmosis (RO) and nanofiltration (NF) are the two dominant membrane separation processes responsible for ion rejection. While RO is highly efficient in removal of ions it needs a high operating pressure and offers very low selectivity between ions. Nanofiltration on the other hand has a comparatively low operating pressure and most commercial membranes offer selectivity in terms of ion rejection. However in many nanofiltration operations rejection of monovalent ions is not appreciable. Therefore a high flux high rejection membrane is needed that can be applied to water purification systems. One such alternative is the usage of polyelectrolyte multilayer membranes that are prepared by the deposition of alternately charged polyelectrolytes via layer-by-layer (LbL) assembly method. LbL is one of the most common self-assembly techniques and finds application in various areas. It has a number of tunable parameters like deposition conditions, number of bilayers deposited etc. which can be manipulated as per the type of application. This technique can be applied to make a nanothin membrane skin which gives high rejection and at the same time allow a high water flux across it. Several research groups have applied this highly versatile technique to prepare membranes that can be employed for water purification. Some of these membranes have shown better performance than the commercial nanofiltration and reverse osmosis membranes. These membranes have the potential to be applied to various different aspects of water treatment like water softening, desalination and recovery of certain ions. Besides the conventional method of LbL technique other alternative methods have also been suggested that can make the technique fast, more efficient and thereby make it more commercially acceptable",
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