Multi-component separation of small molecular/ionic pollutants with smart pH-gating membranes

Liu, Meiling; Li, Lü; Tang, Ming‐Jian; Hong, Lan; Sun, Shi‐Peng; Xing, Weihong

doi:10.1016/j.ces.2021.116854

Cited by 31 publications

(14 citation statements)

References 48 publications

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“…However, after two cycles, the responsiveness of the BABD membrane disappeared and the rejection remained at ≈ 50%, while the BABD-CB membrane shows a stable redox response after eight cycles. The BABD-CB membrane outperforms the state-of-the-art conductive polymer membranes considering both the response level and the number of times it can be cycled ,,− (Figure C). As the result of the unique responsive properties, the membrane exhibits exceptional performance over previously reported membranes (Figure S12).…”

Section: Resultsmentioning

confidence: 99%

Voltage-Gated Membranes Incorporating Cucurbit[n]uril Molecular Containers for Molecular Nanofiltration

et al. 2022

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Smart voltage-gated nanofiltration membranes have enormous potential for on-demand and precise separation of similar molecules, which is an essential element of sustainable water purification and resource recovery. However, the existing voltage-gated membranes are hampered by limited selectivity, stability, and scalability due to electroactive monomer dimerization. Here, for the first time, the host–guest recognition properties of cucurbit[7]uril (CB[7]) are used to protect the viologen derivatives and promote their assembly into the membrane by interfacial polymerization. Viologen functions as a voltage switch, whereas CB[7] complexation prevents its dimerization and improves its redox stability. The inhibited diffusion of the CB[7]-viologen complex enables the precise patterning of the surface structure. The resultant voltage-gated membrane displays 80% improved rejection performance, excellent recovery accuracy for similar molecules, and anti-fouling properties. This work not only provides an innovative strategy for the preparation of voltage-gated smart nanofiltration membranes but also opens up new avenues for ion-selective transmission in water treatment, bionic ion channels, and energy conversion.

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Section: Resultsmentioning

confidence: 99%

Voltage-Gated Membranes Incorporating Cucurbit[n]uril Molecular Containers for Molecular Nanofiltration

et al. 2022

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“…Polymer blends have sparked multidisciplinary attention as a promising modification method due to their simplicity and versatility, as well as having cost- and time-effective routes in producing membranes with attractive separation performance . Recent studies had also applied this method to fabricate a conductive polymer membrane that possess self-cleaning ability via electro-oxidation reactions and a smart pH-responsive membrane which has reversible molecular sieving properties for pollutants removal . Surface coating and surface grafting often suffer from drawbacks such as time-consuming and involvement of a harsh chemical environment .…”

Section: Zwitterionic Membrane Preparation Methodsmentioning

confidence: 99%

“…126 Recent studies had also applied this method to fabricate a conductive polymer membrane that possess self-cleaning ability via electro-oxidation reactions 127 and a smart pH-responsive membrane which has reversible molecular sieving properties for pollutants removal. 128 Surface coating and surface grafting often suffer from drawbacks such as time-consuming and involvement of a harsh chemical environment. 129 As an alternative, a wide range of polymers has been employed as It is also named as surface segregation, where the amphiphilic copolymer tends to self-organize at the water/membrane interface during phase inversion.…”

Section: Zwitterionic Membrane Preparationmentioning

confidence: 99%

Recent Progress of Zwitterionic Materials as Antifouling Membranes for Ultrafiltration, Nanofiltration, and Reverse Osmosis

Lau

Yong

2021

ACS Appl. Polym. Mater.

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Numerous materials have been employed in the surface modification of membranes, including different polymers and nanomaterials over the years. The pernicious challenges of membrane separation include the trade-off between water permeability and solute rejection as well as fouling when it is tested under liquid conditions. Zwitterionic polymers have attracted wide interest due to their unique properties of containing both cationic and anionic groups while maintaining electroneutrality and high hydrophilicity. These zwitterionic polymers have been utilized as coating materials or grafted layers not only on the surfaces of porous membranes but also as thin film composite membranes. To illustrate, the membranes modified with this class of materials are capable of resisting foulants through two distinct mechanisms, which are the hydration layer formation and steric repulsion effect, showcasing their unique chemical properties. To bridge the gaps of the recent development of zwitterionic membranes and their relationships with foulants for targeted separation such as ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO), this critical review will first fundamentally classify the fouling into four categories according to their characteristics and fouling mechanisms, namely, inorganic foulants, nonmigratory foulants, spreadable foulants, and proliferative foulants. The antifouling strategies which are active antifouling and passive antifouling (e.g., fouling resistance and fouling release) will be summarized. Apart from that, the chemistry, morphology, and modification approaches of zwitterionic membranes including surface coating, surface grafting, and physical blending on targeted applications as well as the separation performance of the state-of-the-art membranes will be presented in detail. Lastly, the summary, outlook of major challenges and opportunities of the zwitterionic materials will be highlighted. It is anticipated that this review can generate a pathway to facilitate the next generation of zwitterionicbased membranes with superior separation performance for specific separation.

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“…Filtration-based processes, including reverse osmosis (RO) and nanoltration (NF), which rely on external pressure to drive water molecules across a semi-permeable membrane have become the main technology to obtain clean fresh water and solve the problem of global water shortage. [23][24][25][26] The stateof-the-art RO and NF membranes are polyamide (PA) thin-lm composite (TFC) membranes which are formed by interfacial polymerization (IP), of which the PA NF membrane with the molecular weight cut-off (MWCO) at 200-2000 Da has demonstrated excellent capability to remove a wide range of multivalent salts and organic molecules. 27,28 The ultrathin PA layer of TFC membranes gives low resistance for fast water transport, while the highly crosslinked nature of the PA matrix provides performance stability and desired pore size for highly selective molecular sieving.…”

Section: Introductionmentioning

confidence: 99%

A polyaniline nanofiber array supported ultrathin polyamide membrane for solar-driven volatile organic compound removal

et al. 2022

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Multi-component separation of small molecular/ionic pollutants with smart pH-gating membranes

Cited by 31 publications

References 48 publications

Voltage-Gated Membranes Incorporating Cucurbit[n]uril Molecular Containers for Molecular Nanofiltration

Voltage-Gated Membranes Incorporating Cucurbit[n]uril Molecular Containers for Molecular Nanofiltration

Recent Progress of Zwitterionic Materials as Antifouling Membranes for Ultrafiltration, Nanofiltration, and Reverse Osmosis

A polyaniline nanofiber array supported ultrathin polyamide membrane for solar-driven volatile organic compound removal

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