Ultrafast viscous water flow through nanostrand-channelled graphene oxide membranes

Huang, Hubiao; Song, Zhigong; Wei, Ning; Shi, Li; Mao, Yuxin; Ying, Yulong; Sun, Luwei; Xu, Zhiping; Peng, Xinsheng

doi:10.1038/ncomms3979

Cited by 729 publications

(594 citation statements)

References 52 publications

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“…For example, by intercalating positively charged copper hydroxide nanostrands into GO laminates, followed by partially reducing and then dissolving the copper hydroxide nanostrands, the resulting nanostrand-channeled GO membranes offer a 10-fold enhancement in permeance without sacrificing the rejection rate of organic molecules compared with pristine GO membranes. 30 By intercalating carbon nanotubes into GO layers, the water permeance can be enhanced significantly compared with pure GO membranes, whereas the rejection rates toward large organic molecules are still high. 31,32 Recently, we intercalated monolayer titania-NS into GO laminates, followed by UV-induced photocatalytic reduction, and found that as-prepared reduced GO/titania hybrid membranes showed excellent ion rejection performance while the high water permeance of GO membranes could be preserved.…”

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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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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“…In addition, such an approach does not compromise the rejection efficiency of the membrane for pollutants such as organic dyes. 69,70 In practice, challenges and solutions. Although numerous studies have shown the applicability of this class of membranes for water desalination, in particular as NF membranes, many studies in the literature have addressed current challenges.…”

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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“…In contrast, suitable thin membrane filters-such as those fabricated from thin-film SiN x -allow for much higher flow rates. 13,[47][48][49][50]52,69,232,249,307,320,321 When formed using nanofabrication-compatible materials, these porous thinfilm platforms can be readily integrated into devices and moreover modified to generate functions beyond filtering. Nanopore filters coated with suitable coinage metal films can combine filtering with surface-enhanced Raman spectroscopy (SERS).…”

Section: -319mentioning

confidence: 99%

Through a Window, Brightly: A Review of Selected Nanofabricated Thin-Film Platforms for Spectroscopy, Imaging, and Detection

Dwyer

Harb

2017

Appl Spectrosc

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We present a review of the use of selected nanofabricated thin films to deliver a host of capabilities and insights spanning bioanalytical and biophysical chemistry, materials science, and fundamental molecular-level research. We discuss approaches where thin films have been vital, enabling experimental studies using a variety of optical spectroscopies across the visible and infrared spectral range, electron microscopies, and related techniques such as electron energy loss spectroscopy, X-ray photoelectron spectroscopy, and single molecule sensing. We anchor this broad discussion by highlighting two particularly exciting exemplars: a thin-walled nanofluidic sample cell concept that has advanced the discovery horizons of ultrafast spectroscopy and of electron microscopy investigations of in-liquid samples; and a unique class of thin-film-based nanofluidic devices, designed around a nanopore, with expansive prospects for single molecule sensing. Free-standing, low-stress silicon nitride membranes are a canonical structural element for these applications, and we elucidate the fabrication and resulting features-including mechanical stability, optical properties, X-ray and electron scattering properties, and chemical natureof this material in this format. We also outline design and performance principles and include a discussion of underlying material preparations and properties suitable for understanding the use of alternative thin-film materials such as graphene.

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Ultrafast viscous water flow through nanostrand-channelled graphene oxide membranes

Cited by 729 publications

References 52 publications

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

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

Graphene membranes for water desalination

Through a Window, Brightly: A Review of Selected Nanofabricated Thin-Film Platforms for Spectroscopy, Imaging, and Detection

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