Salt concentration, pH and pressure controlled separation of small molecules through lamellar graphene oxide membranes

Huang, Hubiao; Mao, Yuxin; Ying, Yulong; Liu, Yu; Sun, Luwei; Peng, Xinsheng

doi:10.1039/c3cc41953c

Cited by 378 publications

(272 citation statements)

References 16 publications

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“…S1a) were prepared via a modified Hummers' method (see details in the Methods section), and GO membranes ( Supplementary Fig. S1b) were prepared using vacuum filtration 18 . The thickness of the membranes was adjusted by tuning the volume of GO suspension to be filtrated.…”

Section: Resultsmentioning

confidence: 99%

“…Laminated GO-based membranes assembled using micrometre-sized GO sheets exhibit distinguished characteristics, including hydrophilism, outstanding mechanical strength and good flexibility, which make GO an ideal candidate for nanoscale filtration and sieving applications 18 . For example, Geim and coworkers observed that submicrometre-thick free-standing GO membranes were completely impermeable for gases, including He, H 2 , N 2 and Ar.…”

mentioning

confidence: 99%

“…Graphene oxide (GO), a functionalized graphene derivative, has recently attracted tremendous attention for its potential use in membrane science because of its facile and large-scale production in solution 18 . Laminated GO-based membranes assembled using micrometre-sized GO sheets exhibit distinguished characteristics, including hydrophilism, outstanding mechanical strength and good flexibility, which make GO an ideal candidate for nanoscale filtration and sieving applications 18 .…”

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confidence: 99%

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Ultrafast viscous water flow through nanostrand-channelled graphene oxide membranes

et al. 2013

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Pressure-driven ultrafiltration membranes are important in separation applications. Advanced filtration membranes with high permeance and enhanced rejection must be developed to meet rising worldwide demand. Here we report nanostrand-channelled graphene oxide ultrafiltration membranes with a network of nanochannels with a narrow size distribution (3-5 nm) and superior separation performance. This permeance offers a 10-fold enhancement without sacrificing the rejection rate compared with that of graphene oxide membranes, and is more than 100 times higher than that of commercial ultrafiltration membranes with similar rejection. The flow enhancement is attributed to the porous structure and significantly reduced channel length. An abnormal pressure-dependent separation behaviour is also reported, where the elastic deformation of nanochannels offers tunable permeation and rejection. The water flow through these hydrophilic graphene oxide nanochannels is identified as viscous. This nanostrand-channelling approach is also extendable to other laminate membranes, providing potential for accelerating separation and water-purification processes.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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Ultrafast viscous water flow through nanostrand-channelled graphene oxide membranes

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“…This behavior leads to the expansion of the interlayer space and indirectly adjusts the separation efficiency of the GO membrane. 68 A hybridization strategy can also provide better permeation performance of the GO stacked membrane. By the inclusion of positively charged Cu(OH) 2 nanostrands or nanosized carbon dots in a GO stacked membrane, the water permeability rises several-fold higher.…”

Section: Multilayer Graphene Desalination Membranesmentioning

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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“…23 However, the critical size of 0.9 nm is too large for the separation of small hydrated ions. Therefore, GO membranes have been used mainly for blocking large organic dyes and nanoparticles thus far, [24][25][26] whereas for most commonly available ions in solutions, GO membranes fail to act as a molecular sieve. Considering the charged nature of ions, it is possible to utilize electrostatic interactions between ionized oxygen functional groups (for example, carboxyl) and ions to generate selectivity for the filtration and separation of ions with different valences.…”

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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Salt concentration, pH and pressure controlled separation of small molecules through lamellar graphene oxide membranes

Cited by 378 publications

References 16 publications

Ultrafast viscous water flow through nanostrand-channelled graphene oxide membranes

Ultrafast viscous water flow through nanostrand-channelled graphene oxide membranes

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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