Effective ion sieving with Ti3C2Tx MXene membranes for production of drinking water from seawater

Ding, Li; Li, Libo; Liu, Yanchang; Wu, Yi; Zong, Lu; Deng, Junjie; Wei, Yanying; Caro, Jürgen; Wang, Haihui

doi:10.1038/s41893-020-0474-0

Cited by 510 publications

(307 citation statements)

References 45 publications

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“…Although permeation experiments with different cations were continuously performed on the same Ca-SAT membrane after the Na + permeation test was first conducted, the permeation rate of Na + could be effectively restored only by thorough rinsing using DI water, indicating excellent regenerability. Moreover, recent studies have also confirmed the outstanding antibacterial efficiency and chlorine tolerance of the Ti 3 C 2 T x membrane 40,52 , which also provides evidence of the excellent regenerability of the Ti 3 C 2 T x -based membrane.…”

Section: Resultsmentioning

confidence: 70%

“…The original and pillared Ti 3 C 2 T x membranes were immersed in pure water and different aqueous chloride solutions (Li + , Na + , K + , Rb + , Mg 2+ , Ca 2+ , Al 3+ , and NH 4 + , 0.5 mol/L) for 1 h, ensuring that a sufficient number of ions intercalated into the interspacing. XRD measurements were conducted immediately after gently wiping the free water from the membrane surface 12,40 .…”

Section: Methodsmentioning

confidence: 99%

“…Accordingly, inhibiting the swelling effect and stably constraining the angstrom-scale interlayer are considered keys to enhancing the selectivity property of 2D lamellar membranes. A number of alternative strategies have been proposed to reduce the interlayer spacing, such as physical confinement, cation intercalation and self-cross-linking, leading to a high rejection of ions, independent of size or valence 12,32,39,40 . These membranes demonstrated the exclusion ability to the monovalent ions and hold the promise for desalination.…”

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confidence: 99%

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Ion sieving by a two-dimensional Ti3C2Tx alginate lamellar membrane with stable interlayer spacing

et al. 2020

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Two-dimensional membranes attract extensive interest due to the anomalous transport phenomena; however, the ion separation performance is below the theoretical prediction. The stabilization of d-spacing is a key step for enhancing ion selectivity. Here, we demonstrate a strategy for stabilizing the Ti 3 C 2 T x laminar architecture by alginate hydrogel pillars. After pillared by Ca-alginate, the nanochannel diameters are effectively fixed at 7.4 ± 0.2 Å, and the membrane presents a permeation cutoff and an outstanding sieving property towards valent cations. When applied for acid recovery, the outstanding H + /Fe 2+ selectivity makes the membrane a promising substitution for traditional ion-exchange membranes. Moreover, the ultrathin Mn-alginate pillared membrane with identical d-spacing exhibits 100% Na 2 SO 4 rejection with high water permeance, which is superior to the state-of-the-art nanofiltration membranes. Building on these findings, we demonstrate an efficient method to tune the ion selectivity and introduce a new perspective for energy-and environment-related applications.

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Section: Resultsmentioning

confidence: 70%

Section: Methodsmentioning

confidence: 99%

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confidence: 99%

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Ion sieving by a two-dimensional Ti3C2Tx alginate lamellar membrane with stable interlayer spacing

et al. 2020

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“…This effect is ascribed to the swelling of the MXene layers by GCD cycles, which reduces the electrolyte mobility, thus impeding the performance. [ 37 ] In contrast, the composite electrode retained an areal specific capacitance of approximately 91 mF cm −2 at the same GCD conditions. Meanwhile, the Coulombic efficiency was stabilized at approximately 98%, as shown in Figure 5f.…”

Section: Resultsmentioning

confidence: 99%

In Situ Grown MWCNTs/MXenes Nanocomposites on Carbon Cloth for High‐Performance Flexible Supercapacitors

Chen

Ali

et al. 2020

Adv Funct Materials

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Owing to their large surface-area-to-volume ratios, 2D titanium carbides and nitrides (MXenes) have emerged as promising materials for energy storage devices. However, poor interlayer and interparticle conductivity of MXenes (due to its anisotropic nature) is a bottleneck for widening their applications. Additionally, the stacked structure of MXene sheets limits the exposed surface area and renders a complex electrolyte diffusion. To address these issues, a unique composite comprising of homogeneously grown multiwall carbon nanotubes (MWCNTs) on carbon cloth (CC)-supported MXene sheets (denoted as MWCNTs-MXene@CC) is proposed. The MWCNTs-MXene@CC reveal the synergistic combination of exfoliated large surface area and excellent conductivity. Consequently, the fabricated electrode exhibits a specific capacitance of 114.58 mF cm −2 at a discharge current of 1 mA cm −2 , while maintaining high retention after 1.6 × 10 4 cycles at 10 mA cm −2. Such high performance of the composite structure is attributed to the superb interlayer and interparticle conductivity imparted by the grown MWCNTs. Furthermore, the grown MWCNTs also serve as the interlayer pillar in MXene sheets, thus preventing the spontaneous collapse of the latter. The approach can be extended to other electrocatalyst systems in which ion transport and electrolyte diffusion need to be addressed simultaneously.

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“…And for the larger rifampicin (1.7 nm×1.0 nm), the Ti 3 C 2 T x membrane gives the ethanol permeance of 300.5±10.2 L m −2 h −1 bar −1 and rejection of 96.2±1.8 %. Moreover, it is possible to tune the selectivity by controlled engineering of the interlayer spacing for such 2D MXene membranes theoretically …”

Section: Resultsmentioning

confidence: 72%

Antibiotics Separation with MXene Membranes Based on Regularly Stacked High‐Aspect‐Ratio Nanosheets

Wei

Gao

et al. 2020

Angewandte Chemie

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The uncontrolled release of antibiotics and pharmaceuticals into the environment is a worldwide increasing problem. Thus, highly efficient treatment technologies for wastewater are urgently needed. In this work, seven kinds of typical antibiotics (including water and alcohol soluble ones) are successfully separated from the corresponding aqueous and ethanolic solutions using highly regular laminated membranes. Our membranes are assembled with 2–4 μm titanium carbide nanosheets. The solvent permeance through such titanium carbide membrane is one order of magnitude higher than that through most polymeric nanofiltration membranes with similar antibiotics rejection. This high flux is due to the regular two‐dimensional (2D) structure resulting from the large aspect ratio of titanium carbide nanosheets. Moreover, the electrostatic interaction between the surface terminations and the antibiotics also affects the rejection and enhances the antifouling property. Such 2D titanium carbide membranes further broaden the application scope of laminated materials for separation and purification of high value added drugs in academia and industry.

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Effective ion sieving with Ti3C2Tx MXene membranes for production of drinking water from seawater

Cited by 510 publications

References 45 publications

Ion sieving by a two-dimensional Ti3C2Tx alginate lamellar membrane with stable interlayer spacing

Ion sieving by a two-dimensional Ti3C2Tx alginate lamellar membrane with stable interlayer spacing

In Situ Grown MWCNTs/MXenes Nanocomposites on Carbon Cloth for High‐Performance Flexible Supercapacitors

Antibiotics Separation with MXene Membranes Based on Regularly Stacked High‐Aspect‐Ratio Nanosheets

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