Fabrication of highly selective ion imprinted macroporous membranes with crown ether for targeted separation of lithium ion

Sun, Dongshu; Zhu, Yanzhuo; Meng, Minjia; Qiao, Yu; Yan, Yongsheng; Li, Chunxiang

doi:10.1016/j.seppur.2016.11.029

Cited by 101 publications

(30 citation statements)

References 33 publications

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“…One potential strategy to promote selective ion transport through polymeric membranes involves incorporating ligands to complex ions via host-guest interactions (6,(32)(33)(34)(35). Crown ethers are a class of ligands known to bind various cations depending, in part, on the relative size of their cavity and the size of the target ion (35).…”

Section: Significancementioning

confidence: 99%

Engineering Li/Na selectivity in 12-Crown-4–functionalized polymer membranes

Warnock

Sujanani

Zofchak

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Lithium is widely used in contemporary energy applications, but its isolation from natural reserves is plagued by time-consuming and costly processes. While polymer membranes could, in principle, circumvent these challenges by efficiently extracting lithium from aqueous solutions, they usually exhibit poor ion-specific selectivity. Toward this end, we have incorporated host–guest interactions into a tunable polynorbornene network by copolymerizing 1) 12-crown-4 ligands to impart ion selectivity, 2) poly(ethylene oxide) side chains to control water content, and 3) a crosslinker to form robust solids at room temperature. Single salt transport measurements indicate these materials exhibit unprecedented reverse permeability selectivity (∼2.3) for LiCl over NaCl—the highest documented to date for a dense, water-swollen polymer. As demonstrated by molecular dynamics simulations, this behavior originates from the ability of 12-crown-4 to bind Na+ ions more strongly than Li+ in an aqueous environment, which reduces Na+ mobility (relative to Li+) and offsets the increase in Na+ solubility due to binding with crown ethers. Under mixed salt conditions, 12-crown-4 functionalized membranes showed identical solubility selectivity relative to single salt conditions; however, the permeability and diffusivity selectivity of LiCl over NaCl decreased, presumably due to flux coupling. These results reveal insights for designing advanced membranes with solute-specific selectivity by utilizing host–guest interactions.

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Section: Significancementioning

confidence: 99%

Engineering Li/Na selectivity in 12-Crown-4–functionalized polymer membranes

Warnock

Sujanani

Zofchak

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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“…The regeneration ability was highly improved, which manifested in a slight decline of adsorption performance after five cycle experiments, but could maintain a value of 88.1% after an additional five cycle tests 1 month later. Sun et al successfully fabricated a macro-porous PVDF ion-imprinted membrane with a relatively high adsorption capacity of 27.1 mg/g [136]. They then synthesized an inorganic/organic membrane using 2-methylol-12-crown-4 functionalized GO [137].…”

Section: Organic Adsorbentsmentioning

confidence: 99%

Materials for lithium recovery from salt lake brine

et al. 2020

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Rapid developments in the electric industry have promoted an increasing demand for lithium resources. Lithium in salt lake brines has emerged as the main source for industrial lithium extraction, owing to its low cost and extensive reserves. The effective separation of Mg 2? and Li ? is critical to achieving high recovery efficiency and purity of the final lithium product. This paper summarizes Mg 2? /Li ? separation materials and methods in the field of lithium recovery from salt lake brines. The review begins with an introduction to the global distribution and demand for lithium resources, followed by a description of the materials used in various separation techniques, including precipitation, adsorption, solvent extraction, nanofiltration membrane, electrodialysis, and electrochemical methods. A comparison, analysis, and outlook of such methods are comprehensively discussed in terms of principles, mechanisms, synthesis/operation, development, and industrial applications. We conclude with a presentation of challenges and insights into the future directions of lithium extraction from salt lake brines. A combination of the advantages of various materials is the most logical step toward developing novel methods for extracting lithium from brines with high separation selectivity, stability, low cost, and environmentally friendly characteristics.

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“…Some of the attractive features of IIPs include thermal stability (Ren et al 2008), the potential to segregate and preconcentrate the analyte from other competing ions (Darroudi et al 2020). This has led to the substantial usage of IIPs in separation methods and membrane based technologies (Piletsky et al 1999;Lu et al 2018;Sun et al 2017), this includes solid phase extraction (Hennion 1999;Zhu et al 2019), the production of sensors (Prasad and Jauhari 2015;Bojdi et al 2015) and as stationary phases in high performance liquid chromatography (Bitas and Samanidou 2020). The design of IIPs is adopted from that of molecularly imprinted polymers (MIPs), the imprinted regions imitate the 'lock and key' mechanism of enzymes, in selective extraction or removal of the ion template(s) in the presence of competing ions.…”

Section: Ion Imprinted Polymers As Adsorbentsmentioning

confidence: 99%

Recent developments in materials used for the removal of metal ions from acid mine drainage

Mokgehle

Tavengwa

2021

Appl Water Sci

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Acid mine drainage is the reaction of surface water with sub-surface water located on sulfur bearing rocks, resulting in sulfuric acid. These highly acidic conditions result in leaching of non-biodegradeable heavy metals from rock which then accumulate in flora, posing a significant environmental hazard. Hence, reliable, cost effective remediation techniques are continuously sought after by researchers. A range of materials were examined as adsorbents in the extraction of heavy metal ions from acid mine drainage (AMD). However, these materials generally have moderate to poor adsorption capacities. To address this problem, researchers have recently turned to nano-sized materials to enhance the surface area of the adsorbent when in contact with the heavy metal solution. Lately, there have been developments in studying the surface chemistry of nano-engineered materials during adsorption, which involved alterations in the physical and chemical make-up of nanomaterials. The resultant surface engineered nanomaterials have been proven to show rapid adsorption rates and remarkable adsorption capacities for removal of a wide range of heavy metal contaminants in AMD compared to the unmodified nanomaterials. A brief overview of zeolites as adsorbents and the developent of nanosorbents to modernly applied magnetic sorbents and ion imprinted polymers will be discussed. This work provides researchers with thorough insight into the adsorption mechanism and performance of nanosorbents, and finds common ground between the past, present and future of these versatile materials.

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Fabrication of highly selective ion imprinted macroporous membranes with crown ether for targeted separation of lithium ion

Cited by 101 publications

References 33 publications

Engineering Li/Na selectivity in 12-Crown-4–functionalized polymer membranes

Engineering Li/Na selectivity in 12-Crown-4–functionalized polymer membranes

Materials for lithium recovery from salt lake brine

Recent developments in materials used for the removal of metal ions from acid mine drainage

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