Graphene oxide-assisted membranes: Fabrication and potential applications in desalination and water purification

Hegab, Hanaa M.; Zou, Linda

doi:10.1016/j.memsci.2015.03.011

Cited by 557 publications

(219 citation statements)

References 129 publications

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“…56 The more hydrophilic of PPA/GO membranes surface, the more water molecules were attracted and permitted to pass through the membrane. 57 Apart from the key factor, the other reasons could also help to improve the water ux such as the increased membrane free volume due to the mobilization of GO nanosheets in PPA/GO membrane disrupted polymer chain packing, 49 the slightly increased mean effective pore size. This results were corresponding with the other reports.…”

Section: Effect Of Go Concentration For Membrane Performancementioning

confidence: 99%

Graphene oxide polypiperazine-amide nanofiltration membrane for improving flux and anti-fouling in water purification

et al. 2016

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In this study, a facile polypiperazine-amide (PPA) composite nanofiltration (NF) membrane with nanomaterial graphene oxide (GO) incorporated into a polyamide (PA) layer for high water flux and anti-fouling was fabricated by interfacial polymerization (IP). The chemical composition, structure and surface properties of the fabricated PPA/GO and PPA composite NF membranes were characterized by FTIR, XPS, FE-SEM, AFM, zeta-potential and contact angle measurements. The separation properties and anti-fouling ability of the PPA/GO NF membrane were investigated and discussed. The experimental results indicated that the water flux of the PPA/GO (300 mgunder the operating pressure of 0.6 MPa, almost 1.4 times that of the PPA (without GO) membrane.However, the high salt rejection was still retained in the order of Na 2 SO 4 (98.2%) > MgSO 4 (96.5%) > NaCl (56.8%) > MgCl 2 (50.5%). An anti-fouling test revealed that the PPA/GO membrane had excellent antifouling properties due to the enhanced hydrophilicity and decreased roughness induced by the GO nanosheets. Thus, the PPA/GO membrane can be efficiently and endurably applied in water purification.

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Section: Effect Of Go Concentration For Membrane Performancementioning

confidence: 99%

Graphene oxide polypiperazine-amide nanofiltration membrane for improving flux and anti-fouling in water purification

et al. 2016

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“…Although the necessary application of pressure in advanced RO systems is nearly equal to the thermodynamic limit, any extra reduction can notably affect the membrane performance. 11 Cohen-Tanugi and Grossman 12 found that using an RO membrane with three times higher permeability lowers the required pressure for seawater RO and brackish water plants by 44% and 63%, respectively. These values can be interpreted as a reduction in energy consumption of 15 and 46%.…”

Section: Introductionmentioning

confidence: 99%

“…The reduction in energy consumption is meaningful because of the high cost of energy, that is, 50% of the total water desalination cost. 11 The classic semipermeable RO membrane is still based on the same polyamide thin-film composite design that was developed three decades ago. 12 The most permeable thin-film composite membranes currently offer only 1.5-2 times higher permeability than that 20 years ago and they are still damaged when contacting chlorine; thus, disinfection becomes challenging and the fouling tendency increases.…”

Section: Introductionmentioning

confidence: 99%

Graphene membranes for water desalination

2017

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Extensive environmental pollution caused by worldwide industrialization and population growth has led to a water shortage. This problem lowers the quality of human life and wastes a large amount of money worldwide each year due to the related consequences. One main solution for this challenge is water purification. State-of-the-art water purification necessitates the implementation of novel materials and technologies that are cost and energy efficient. In this regard, graphene nanomaterials, with their unique physicochemical properties, are an optimum choice. These materials offer extraordinarily high surface area, mechanical durability, atomic thickness, nanosized pores and reactivity toward polar and non-polar water pollutants. These characteristics impart high selectivity and water permeability, and thus provide excellent water purification efficiency. This review introduces the potential of graphene membranes for water desalination. Although literature reviews have mostly concerned graphene's capability for the adsorption and photocatalysis of water pollutants, updated knowledge related to its sieving properties is quite limited. NPG Asia Materials (2017) 9, e427; doi:10.1038/am.2017.135; published online 25 August 2017 INTRODUCTION Currently,~1.2 billion people around the world are suffering from a shortage of water and its adverse consequences on health, food and energy. 1,2 On one hand, population growth, increased industrialization and greater energy needs and, on the other hand, loss of snowmelt, shrinkage of glaciers and so on will worsen this situation in upcoming years. As estimated by the world water council, the number of affected people will rise to 3.9 billion in the coming decades. 2,3 One of the most promising approaches to alleviate the water shortage, desalination can increase the water supply beyond what is available from the hydrological cycle. 4 Seawater desalination indeed provides an infinite, steady supply of high-quality water that does not harm natural freshwater ecosystems.Seawater comprises a vast supply of water (97.5% of all water on the planet). Thus, the growth of the installation of seawater desalination facilities in the past decade to circumvent water shortage problems in water-stressed countries has progressed quickly. In 2016, the global water production by desalination was estimated to be 38 billion cubic meter per year, that is, two times higher than that in 2008. 5 So far, seawater desalination has been mainly performed via multistage flash distillation and reverse osmosis (RO). 6 Mostly in the arid Persian Gulf countries, desalination plants perform based on heating and then condensing seawater. This kind of desalination plant consumes large amounts of thermal and electric energy, thus emitting greenhouse gases extensively. 7 In addition to this non-economical and non-ecofriendly version of desalination plants, the main type of desalination plants constructed in the past two decades, as well as future planned ones, are based on RO technology (Figure 1). 8

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“…[4][5][6][7][8][9] Among them, graphene oxide (GO), prepared by the oxidation and exfoliation of graphite, is an excellent graphene derivative with great promise as a two-dimensional (2D) building block for the construction of separation membranes toward practical applications owing to its characteristics, such as ease of large-scale synthesis and functionalization. [10][11][12][13] Because of the liquid-phaseprocessing feasibility, large-area and mechanically robust GO laminates with controllable thicknesses can be readily prepared via a series of liquid-phase membrane assembly techniques, such as drop-casting, 14,15 vacuum filtration 16,17 and spin-coating. 18,19 In view of the structure of GO, various oxygen-containing functional groups (for example, hydroxyl, epoxy, carbonyl and carboxyl) decorate the graphene basal plane and its edges, resulting in numerous sp 2 aromatic clusters isolated within the sp 3 C-O matrix.…”

Section: Introductionmentioning

confidence: 99%

Highly selective charge-guided ion transport through a hybrid membrane consisting of anionic graphene oxide and cationic hydroxide nanosheet superlattice units

Sun

et al. 2016

NPG Asia Mater

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The development of graphene-based functional membranes with the ability to effectively filter and separate molecules or ions in solutions based on a simple criterion (for example, the size or charge of solutes) is crucial for various engineering-relevant applications, ranging from wastewater purification and reuse to chemical refinement. Here, we report a hybrid membrane consisting of anionic graphene oxide (GO) and cationic Co-Al (or Mg-Al) layered double hydroxide (LDH) nanosheet (NS) superlattice units for high selectivity charge-guided ion transport. The hybrid membrane possesses a series of characteristics, including being easy to access, mechanically robust, freestanding, flexible and semitransparent as well as having a large area. The interlayer spacing of the hybrid membrane is insensitive to humidity variations, ensuring the structural stability in solution-based mass transport applications. The concentration gradient-driven ion transmembrane diffusion experiments show that the cations bearing various valences can be effectively separated strictly according to their charges, independent of the cationic and charge-balancing anionic species. The relative selectivity of the hybrid membranes toward monovalent and trivalent cations is as high as 30, which is not achievable by GO multilayer stacks, LDH-NS multilayer stacks or their bulk-stratified membranes, indicating that a synergistic effect originating from the molecular-level heteroassembly of GO and LDH-NS has a dominant role in the high-performance charge-guided ion filtration and separation processes. These excellent properties of GO/LDH-NS hybrid membranes make them promising candidates in diverse applications, ranging from wastewater treatment and reuse and chemical refinement to biomimetic selective ion transport.

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Graphene oxide-assisted membranes: Fabrication and potential applications in desalination and water purification

Cited by 557 publications

References 129 publications

Graphene oxide polypiperazine-amide nanofiltration membrane for improving flux and anti-fouling in water purification

Graphene oxide polypiperazine-amide nanofiltration membrane for improving flux and anti-fouling in water purification

Graphene membranes for water desalination

Highly selective charge-guided ion transport through a hybrid membrane consisting of anionic graphene oxide and cationic hydroxide nanosheet superlattice units

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