Elsevier

Journal of Membrane Science

Volume 479, 1 April 2015, Pages 256-275
Journal of Membrane Science

Polymer-matrix nanocomposite membranes for water treatment

https://doi.org/10.1016/j.memsci.2014.11.019Get rights and content

Highlights

  • Summarize recent scientific and technological advances in the nanocomposite membrane development.

  • Classify nanocomposites based on membrane structure and nanomaterial location.

  • Discuss challenges and future research directions in developing nanocomposite membranes.

Abstract

One of the grand challenges to sustain the modern society is to secure adequate water resources of desirable quality for various designated uses. To address this challenge, membrane water treatment is expected to play an increasingly important role in areas such as drinking water treatment, brackish and seawater desalination, and wastewater treatment and reuse. Existing membranes for water treatment, typically polymeric in nature, are still restricted by several challenges including the trade-off relationship between permeability and selectivity (also called Robeson upper boundary in membrane gas separation), and low resistance to fouling. Nanocomposite membranes, a new class of membranes fabricated by combining polymeric materials with nanomaterials, are emerging as a promising solution to these challenges. The advanced nanocomposite membranes could be designed to meet specific water treatment applications by tuning their structure and physicochemical properties (e.g. hydrophilicity, porosity, charge density, and thermal and mechanical stability) and introducing unique functionalities (e.g. antibacterial, photocatalytic or adsorptive capabilities). This review is to summarize the recent scientific and technological advances in the development of nanocomposite membranes for water treatment. The nanocomposite membranes were classified into (1) conventional nanocomposite, (2) thin-film nanocomposite (TFN), (3) thin-film composite (TFC) with nanocomposite substrate, and (4) surface located nanocomposite, based on the membrane structure and location of nanomaterial. Challenges and future research directions in developing high performance nanocomposite membranes were also discussed.

Introduction

Water is the foundation of life. However, due to the rapid growth of world population, abuse of water resources, and water pollution, water shortage problem becomes more and more serious. Worldwide, around 780 million people still lack access to improved drinking water sources (WHO, Progress on Drinking Water and Sanitation, 2012). Hence, cost-effective technologies must be developed to extend water resources and solve water pollution problems. Membrane water treatment is expected to play an increasingly important role in areas such as drinking water treatment, brackish and seawater desalination, and wastewater treatment and reuse, because it is simple in concept and operation, does not involve phase changes or chemical additives, and can be made modular for easy scale up [1], [2].

Polymeric membrane is currently the most widely used membrane type for water treatment due to its straightforward pore forming mechanism, higher flexibility, smaller footprints required for installation and relatively low costs compared to inorganic membrane equivalents [3]. However, it is still restricted by several challenges such as trade-off relationship between permeability and selectivity (also called Robeson upper boundary in membrane gas separation), and low resistance to fouling. The development of membranes with high permeability and rejection, and good antifouling property is much needed for water purification under the context of energy efficiency and cost effectiveness.

Polymer-matrix nanocomposite membranes are advanced membranes with nanomaterials dispersed in their polymer matrices. They could be used for gas–gas, liquid–liquid, and liquid–solid separations. The concept of making nanocomposite membranes was originally developed to overcome the Robeson upper boundary in the field of gas separation in the 1990s [4], [5], where highly selective zeolites were incorporated into polymers to improve both permeability and selectivity [6], [7]. Besides gas separation [8], [9], [10], many other applications have been examined by using nanocomposite membranes, such as direct methanol fuel cells [11], [12], proton exchange membrane fuel cells (PEMFCs) [13], sensor applications [14], [15], lithium ion battery [16], [17], pervaporation (PV) [18], [19], [20], organic solvent nanofiltration (OSN) [21], [22], and water treatment. Due to its promise of overcoming the trade-off relationship between permeability and selectivity as well as mitigating membrane fouling problem during water treatment applications, it has gained considerable attention and is considered as the cutting edge of creating the next generation of high performance membranes.

The aim of this review is to summarize the recent scientific and technological advances in the development of nanocomposite membranes for water treatment. Challenges and future research directions will also be discussed. Readers interested in gas separation are referred to two excellent reviews recently published on nanocomposite gas separation membranes [5], [8].

According to membrane structure and location of nanomaterials, nanocomposite membranes can be classified into four categories: (1) conventional nanocomposite; (2) thin-film nanocomposite (TFN); (3) thin-film composite (TFC) with nanocomposite substrate; and (4) surface located nanocomposite. The typical structures of these membranes are illustrated in Fig. 1. It is worth noting that the red spheres used in the figure not only stand for nanoparticles (NPs), but also could represent nanotubes, nanofibers or nanosheets. The publication numbers related to each type of the nanocomposite membranes for water treatment are also depicted in Fig. 1, where the data are obtained based on searching and screening using the key words “nanocomposite and membrane” or “mixed matrix and membrane” in the database, Scopus.

Section snippets

Conventional nanocomposite

In the conventional nanocomposite membranes, nanofillers fall into one of the four categories: 1) inorganic material; 2) organic material; 3) biomaterial, and 4) hybrid material with two or more material types. Fabrication of nanocomposite membranes is mostly based on phase inversion (PI) method in which nanofillers are dispersed in polymer solution prior to the PI process, and can be prepared in either flat sheet or hollow fiber configurations (Fig. 2). This type of membrane is mainly used in

Thin-film nanocomposite (TFN)

Thin film composite (TFC) membrane consists of an ultra-thin barrier layer (commonly made of PA) atop a more porous supporting layer. It has been the major type of RO/NF membrane since being first developed by Cadotte in the 1970s [158], and widely used to desalinate seawater/brackish water or remove heavy metals, hardness, organic micropollutants such as pesticides, disinfection by-products (DBPs), endocrine disrupting compounds (EDCs), and pharmaceutically active compounds. Recently, the

TFC with nanocomposite substrate

This class of membranes was first developed to investigate the effects of nanofiller on membrane compaction behavior, which is listed along with other studies in Table 3. In that study by Pendergast et al. [215], silica or zeolite NPs were embedded into the PSU substrate, which was then used in the IP process to prepare TFC membranes for RO. The prepared membranes showed a higher initial permeability and experienced less flux decline during the compaction when compared with the original TFC

Surface located nanocomposite

In addition to membrane structure, porosity and thickness, membrane surface properties such as hydrophilicity, pore size, charge density, and roughness have a major impact on the membrane performance in terms of separation and antifouling characteristics. Modification of surface properties, therefore, could significantly improve the efficiency of membrane water treatment, as for surface-located nanocomposite membranes listed in Table 4. The process of preparing this type of membranes has

Conclusions and perspectives

Progress in the development of polymer-matrix nanocomposite membranes for water treatment has been tremendous in recent years. Besides tuning the physicochemical properties of membranes (hydrophilicity, porosity, charge density, thermal, and mechanical stability), the incorporation of nanomaterials can provide membranes with some unique properties of nanomaterials and also possibly induce new characteristics and functions based on their synergetic effects. It provides a new dimension to design

Acknowledgments

Financial support of this research was partially provided by the United States Geological Survey (G11AP20089) through Missouri Water Resources Research Center (MWRRC).

References (258)

  • Y.C. Wang et al.

    Polyamide/SDS-clay hybrid nanocomposite membrane application to water–ethanol mixture pervaporation separation

    J. Membr. Sci.

    (2004)
  • F. Peng et al.

    Novel nanocomposite pervaporation membranes composed of poly(vinyl alcohol) and chitosan-wrapped carbon nanotube

    J. Membr. Sci.

    (2007)
  • D. Yang et al.

    Chitosan/TiO2 nanocomposite pervaporation membranes for ethanol dehydration

    Chem. Eng. Sci.

    (2009)
  • I. Soroko et al.

    Impact of TiO2 nanoparticles on morphology and performance of crosslinked polyimide organic solvent nanofiltration (OSN) membranes

    J. Membr. Sci.

    (2009)
  • K. Ebert et al.

    Influence of inorganic fillers on the compaction behaviour of porous polymer based membranes

    J. Membr. Sci.

    (2004)
  • T.H. Bae et al.

    Effect of TiO2 nanoparticles on fouling mitigation of ultrafiltration membranes for activated sludge filtration

    J. Membr. Sci.

    (2005)
  • J. María Arsuaga et al.

    Influence of the type, size, and distribution of metal oxide particles on the properties of nanocomposite ultrafiltration membranes

    J. Membr. Sci.

    (2013)
  • X. Cao et al.

    Effect of TiO2 nanoparticle size on the performance of PVDF membrane

    Appl. Surf. Sci.

    (2006)
  • Y. Xiao et al.

    Evolution of nano-particle distribution during the fabrication of mixed matrix TiO2-polyimide hollow fiber membranes

    Chem. Eng. Sci.

    (2006)
  • Y. Yang et al.

    The influence of nano-sized TiO2 fillers on the morphologies and properties of PSF UF membrane

    J. Membr. Sci.

    (2007)
  • G. Wu et al.

    Preparation and characterization of PES/TiO2 composite membranes

    Appl. Surf. Sci.

    (2008)
  • J.F. Li et al.

    Effect of TiO2 nanoparticles on the surface morphology and performance of microporous PES membrane

    Appl. Surf. Sci.

    (2009)
  • S.J. Oh et al.

    Preparation and characterization of PVDF/TiO2 organic–inorganic composite membranes for fouling resistance improvement

    J. Membr. Sci.

    (2009)
  • A. Razmjou et al.

    The effects of mechanical and chemical modification of TiO2 nanoparticles on the surface chemistry, structure and fouling performance of PES ultrafiltration membranes

    J. Membr. Sci.

    (2011)
  • S.S. Madaeni et al.

    A new approach to improve antifouling property of PVDF membrane using in situ polymerization of PAA functionalized TiO2 nanoparticles

    J. Membr. Sci.

    (2011)
  • N.A.A. Hamid et al.

    Morphological and separation performance study of polysulfone/titanium dioxide (PSF/TiO2) ultrafiltration membranes for humic acid removal

    Desalination

    (2011)
  • R. Abedini et al.

    A novel cellulose acetate (CA) membrane using TiO2 nanoparticles: preparation, characterization and permeation study

    Desalination

    (2011)
  • E. Yuliwati et al.

    Effect of additives concentration on the surface properties and performance of PVDF ultrafiltration membranes for refinery produced wastewater treatment

    Desalination

    (2011)
  • A. Rahimpour et al.

    TiO2 entrapped nano-composite PVDF/SPES membranes: preparation, characterization, antifouling and antibacterial properties

    Desalination

    (2011)
  • A. Sotto et al.

    Effect of nanoparticle aggregation at low concentrations of TiO2 on the hydrophilicity, morphology, and fouling resistance of PES-TiO2 membranes

    J. Colloid Interface Sci.

    (2011)
  • V. Vatanpour et al.

    TiO2 embedded mixed matrix PES nanocomposite membranes: influence of different sizes and types of nanoparticles on antifouling and performance

    Desalination

    (2012)
  • A. Razmjou et al.

    The effect of modified TiO2 nanoparticles on the polyethersulfone ultrafiltration hollow fiber membranes

    Desalination

    (2012)
  • S.S. Homaeigohar et al.

    Extraordinarily water permeable sol-gel formed nanocomposite nanofibrous membranes

    J. Colloid Interface Sci.

    (2012)
  • S. Zhao et al.

    Thermostable PPESK/TiO2 nanocomposite ultrafiltration membrane for high temperature condensed water treatment

    Desalination

    (2012)
  • V. Vatanpour et al.

    Novel antibifouling nanofiltration polyethersulfone membrane fabricated from embedding TiO2 coated multiwalled carbon nanotubes

    Sep. Purif. Technol.

    (2012)
  • H.P. Ngang et al.

    Preparation of mixed-matrix membranes for micellar enhanced ultrafiltration based on response surface methodology

    Desalination

    (2012)
  • G. Zhang et al.

    Novel polysulfone hybrid ultrafiltration membrane prepared with TiO2-g-HEMA and its antifouling characteristics

    J. Membr. Sci.

    (2013)
  • F. Zhang et al.

    Sol-gel preparation of PAA-g-PVDF/TiO2 nanocomposite hollow fiber membranes with extremely high water flux and improved antifouling property

    J. Membr. Sci.

    (2013)
  • H. Joo Kim et al.

    Fabrication of multifunctional TiO2-fly ash/polyurethane nanocomposite membrane via electrospinning

    Ceram. Int.

    (2014)
  • A. Rahimpour et al.

    Coupling TiO2 nanoparticles with UV irradiation for modification of polyethersulfone ultrafiltration membranes

    J. Membr. Sci.

    (2008)
  • R.A. Damodar et al.

    Study the self cleaning, antibacterial and photocatalytic properties of TiO2 entrapped PVDF membranes

    J. Hazard. Mater.

    (2009)
  • H.P. Ngang et al.

    Preparation of PVDF-TiO2 mixed-matrix membrane and its evaluation on dye adsorption and UV-cleaning properties

    Chem. Eng. J.

    (2012)
  • E.M.V. Hoek et al.

    Physical-chemical properties, separation performance, and fouling resistance of mixed-matrix ultrafiltration membranes

    Desalination

    (2011)
  • A. Jomekian et al.

    Synthesis and characterization of novel PEO-MCM-41/PVDC nanocomposite membrane

    Desalination

    (2011)
  • J.N. Shen et al.

    Preparation and characterization of PES-SiO2 organic-inorganic composite ultrafiltration membrane for raw water pretreatment

    Chem. Eng. J.

    (2011)
  • J. Huang et al.

    Fabrication of polyethersulfone-mesoporous silica nanocomposite ultrafiltration membranes with antifouling properties

    J. Membr. Sci.

    (2012)
  • H. Wu et al.

    Development of novel SiO2-GO nanohybrid/polysulfone membrane with enhanced performance

    J. Membr. Sci.

    (2014)
  • L. Yan et al.

    Application of the Al2O3-PVDF nanocomposite tubular ultrafiltration (UF) membrane for oily wastewater treatment and its antifouling research

    Sep. Purif. Technol.

    (2009)
  • N. Maximous et al.

    Preparation, characterization and performance of Al2O3/PES membrane for wastewater filtration

    J. Membr. Sci.

    (2009)
  • N. Maximous et al.

    Optimization of Al2O3/PES membranes for wastewater filtration

    Sep. Purif. Technol.

    (2010)
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