Zwitterionic Ion-Selective Membranes with Tunable Subnanometer Pores and Excellent Fouling Resistance

Lounder, Samuel J.; Asatekin, Ayşe

doi:10.1021/acs.chemmater.1c00374

Cited by 40 publications

(57 citation statements)

References 54 publications

(155 reference statements)

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“…The rejections of vitamin B12 and riboflavin by the TCZ-0 membrane were 82% and 33%, respectively, consistent with previous studies. [19] The rejections of both solutes increased with increasing exposure time, stabilizing once again after 30-40 s, consistent with the permeance results (Table 1).…”

Section: Membrane Permeability and Selectivitysupporting

confidence: 86%

“…This morphology is similar to those observed for other ZACs. [19,24] P(AM-r-SBMA) was coated onto a commercial support membrane (Solecta, PS-35) to form a TFC membrane. For this purpose, P(AM-r-SBMA) was dissolved in TFE to form a 5 wt% solution, which was coated on top of the support by using a wire-wound metering rod.…”

Section: Membrane Fabrication and Cross-linkingmentioning

confidence: 99%

“…Furthermore, adapting ZAC-based membranes to exhibit NF-like selectivity would enable us to circumvent major limitations arising from the inherent chemical structure of interfacially polymerized polyamide NF membranes, including chlorine sensitivity [19,20] and fouling. [19,20,23,41] Post-functionalization is a common approach for tailoring the properties and functionality of membranes after nanostructure formation. [42] This approach has previously been used to tune ion rejection and selectivity of membranes and to enhance fouling resistance.…”

Section: Introductionmentioning

confidence: 99%

“…[20,23,52] We show that the resultant membranes not only exhibit high and tunable monovalent/divalent ion selectivity, but also excellent fouling resistance. These novel membranes feature selective layers fabricated from the cross-linkable ZAC poly(allyl methacrylate-random-sulfobetaine methacrylate) (P(AM-r-SBMA)), [19] whose chemical structure is shown in Figure 1B. In previous work, we had used photo polymerization as a cross-linking method.…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14][15][16][17][18] Nanofiltration (NF) membranes, defined by nominal pore diameters of ≈1-3 nm, are typically considered for these separations, even though their selectivity is complex, incorporating size, charge, and polarity effects. [19,20] NF membranes are typically thin film composite (TFC) membranes with cross-linked polyamide (PA) selective layers. While PA-TFC NF membranes are well-established in the industry, it is extremely difficult to control and tune their selectivity for specific separations.…”

mentioning

confidence: 99%

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Ultra‐Fast Click Modification of Self‐Assembled Zwitterionic Copolymer Membranes for Enhanced Ion Selectivity

Mondal

Lounder

Mazzaferro

et al. 2022

Adv Materials Inter

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Membranes that can separate small molecules and ions are of immense interest in various separations. Self‐assembling zwitterionic amphiphilic copolymers (ZACs) are extremely promising as exceptionally fouling‐resistant membrane selective layers with narrow size cut‐offs. However, it is difficult to tune their effective pore size within time frames compatible with roll‐to‐roll manufacturing. We report a novel, ultra‐fast approach for tuning the pore size of ZAC‐based membranes through thiol‐ene click chemistry that brings the needed post‐modification time from tens of minutes to only 10–40 s, making its integration feasible in large scale manufacturing systems. Resultant membranes have enhanced organic molecule and salt rejections, resulting in tunable mono‐/divalent ion selectivity. For instance, cross‐linking increases Na2SO4 rejections from <20% to up to 83%, while NaCl rejection remains below 30%. Furthermore, these membranes completely resist fouling by oil and proteins, outperforming commercial membranes. These results suggest that our cross‐linked membranes have the potential to be used in separations in the food industry, pharmaceutical manufacturing, and wastewater treatment.

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Section: Membrane Permeability and Selectivitysupporting

confidence: 86%

Section: Membrane Fabrication and Cross-linkingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Ultra‐Fast Click Modification of Self‐Assembled Zwitterionic Copolymer Membranes for Enhanced Ion Selectivity

Mondal

Lounder

Mazzaferro

et al. 2022

Adv Materials Inter

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Adaptive Gating Enhances Intelligent Membranes for Cellular Functions and Precise Separations

Zhang,

Xing,

Huang

et al. 2023

Adv Funct Materials

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Intelligent membranes with adaptive gating channels play a crucial role in cellular functions and separation processes. This study introduces a novel approach to controlling channel expansion using biomimetic adaptive aggregates, fundamentally overcoming the drawbacks of existing methods relying on intertwined polyelectrolyte chains for channel blockage. Specifically, a pH‐responsive 2D material membrane is constructed through the self‐assembling of protein‐mimetic zwitterionic polydopamine (ZPDA) soft molecular aggregates within graphene oxide (GO) interlayers. Similar to the conformational switch of inserted proteins in cellular membranes, the embedded ZPDA in GO nanofluidic channels undergoes an adaptive conformational transformation in response to pH changes. This dynamic adjustment of ZPDA physicochemical properties allows for reversible regulation of GO nanofluidic channel size and charge by external pH modulation. The resulting GO/ZPDA membrane exhibits programmable separation performance for dye molecules (i.e., water permeance of 18.8–35.4 L m−2 h−1 bar−1 and molecular selectivity of 73.7–32.9) and salt ions (i.e., ionic permeance of 0.69–1.25 mol m−2 h−1 and ionic selectivity of 20.8–21.9). This work sheds new light on the engineering of intelligent stimuli‐responsive 2D nanofluidic channels with adaptive gating properties, holding promise across a wide range of applications including separation, drug delivery, sensing, and catalysis.

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Tunable Ionic Sieving Membrane via Reactive Layer‐By‐Layer Assembly of Porous Organic Cages

Zhang,

Hao,

Hussein

et al. 2024

Adv Funct Materials

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Selectively permeable membranes with subnanosized pores show potential for applications in saline wastewater treatment and resource recovery. Here, a novel ionic sieving membrane (ISM) is fabricated via reactive layer‐by‐layer assembly of reduced porous organic cages, providing confined pores for the entry of monovalent ions and the interception of divalent ions. The ion separation performance of ISMs can be tuned by varying the concentration of reduced porous organic cages during the assembly. The highly permeable ISM featuring a surface potential of −52 mV and widely distributed aperture (µp = 0.69 nm, σp = 1.37) preferentially permits the passage of Cl− over SO42−, resulting in remarkable permeance of 9.4 L m−2 h−1 bar−1 and Cl−/SO42− selectivity of 50.3. However, the highly selective ISM with a surface potential of −30 mV and narrowly distributed aperture (µp = 0.66 nm, σp = 1.27) exhibits superior Cl−/SO42− selectivity of 277.3 and Li+/Mg2+ selectivity of 64.7, indicating that the regular subnanosized pore structure plays a dominant role in achieving precise separation of mono‐/divalent ions. Moreover, owing to the acquired excellent Li+/Mg2+ selectivity, for the first time, lithium extraction from simulated salt lake brine is achieved by a two‐stage nanofiltration process with reduced Mg2+/Li+ mass ratio from 40 to 0.3.

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Zwitterionic Ion-Selective Membranes with Tunable Subnanometer Pores and Excellent Fouling Resistance

Cited by 40 publications

References 54 publications

Ultra‐Fast Click Modification of Self‐Assembled Zwitterionic Copolymer Membranes for Enhanced Ion Selectivity

Ultra‐Fast Click Modification of Self‐Assembled Zwitterionic Copolymer Membranes for Enhanced Ion Selectivity

Adaptive Gating Enhances Intelligent Membranes for Cellular Functions and Precise Separations

Tunable Ionic Sieving Membrane via Reactive Layer‐By‐Layer Assembly of Porous Organic Cages

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