Dual-electric layer nanofiltration membranes based on polyphenol/PEI interlayer for highly efficient Mg2+/Li+ separation

Chen, Kuo; Zhao, Shengchao; Lan, Hongling; Xie, Tengteng; Chen, Yuhao; Sun, Haixiang; Niu, Q. Jason; Feng, Xiang

doi:10.1016/j.memsci.2022.120860

Cited by 42 publications

(9 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition to TA, polyphenol-polyethyleneimine (PEI) coatings have also been used as interlayer materials. PEI possesses numerous primary amine groups, which can impart a significant positive charge to the interlayer, thereby increasing the surface potential of the NF membrane [ 33 ]. Additionally, PEI can form uniform nanoscale aggregates with polyphenols, which enhances interlayer stability and hydrophilicity [ 25 , 33 ].…”

Section: Organic Interlayersmentioning

confidence: 99%

“…PEI possesses numerous primary amine groups, which can impart a significant positive charge to the interlayer, thereby increasing the surface potential of the NF membrane [ 33 ]. Additionally, PEI can form uniform nanoscale aggregates with polyphenols, which enhances interlayer stability and hydrophilicity [ 25 , 33 ]. For example, Zhai et al [ 25 ] deposited large cyclic polyphenol molecules Noria-PEI onto a PSF UF substrate, where they underwent a Schiff base reaction to form covalent bonds and obtain a stable and uniform interlayer composed of a homogeneous nanoscale adhesive aggregate.…”

Section: Organic Interlayersmentioning

confidence: 99%

“…The optimized membrane exhibits a permeated flux of approximately 28 L m 2− h −1 bar −1 and rejection rates exceeding 96.0% for Na 2 SO 4 , MgSO 4 , MgCl 2 , and CaCl 2 . Inspired by this study, 5,5′,6,6′-tetrahydroxy-3,3,3′,3′-tetramethyl-1,1′-spirobisindane(TTSBI)-PEI [ 34 ] and catechol-PEI [ 33 ] have also been employed as interlayers to fabricate NF membranes with exceptional properties.…”

Section: Organic Interlayersmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Interlayer Construction on TFC Nanofiltration Membrane Performance: A Review from Materials Perspective

2023

View full text Add to dashboard Cite

Polyamide (PA) thin-film composite (TFC) nanofiltration (NF) membranes, which are extensively utilized in seawater desalination and water purification, are limited by the upper bounds of permeability-selectivity. Recently, constructing an interlayer between the porous substrate and the PA layer has been considered a promising approach, as it may resolve the trade-off between permeability and selectivity, which is ubiquitous in NF membranes. The progress in interlayer technology has enabled the precise control of the interfacial polymerization (IP) process, which regulates the structure and performance of TFC NF membranes, resulting in a thin, dense, and defect-free PA selective layer. This review presents a summary of the latest developments in TFC NF membranes based on various interlayer materials. By drawing from existing literature, the structure and performance of new TFC NF membranes using different interlayer materials, such as organic interlayers (polyphenols, ion polymers, polymer organic acids, and other organic materials) and nanomaterial interlayers (nanoparticles, one-dimensional nanomaterials, and two-dimensional nanomaterials), are systematically reviewed and compared. Additionally, this paper proposes the perspectives of interlayer-based TFC NF membranes and the efforts required in the future. This review provides a comprehensive understanding and valuable guidance for the rational design of advanced NF membranes mediated by interlayers for seawater desalination and water purification.

show abstract

Section: Organic Interlayersmentioning

confidence: 99%

Section: Organic Interlayersmentioning

confidence: 99%

Section: Organic Interlayersmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Interlayer Construction on TFC Nanofiltration Membrane Performance: A Review from Materials Perspective

2023

View full text Add to dashboard Cite

show abstract

“…21 Though these membranes are especially suitable for some applications, in some other applications where a sufficiently higher rejection of divalent cations over that of monovalent cations is required, the membrane would be favorably endowed with less negative or even positive charges on the surface. In the literature, various approaches were adopted for preparing positively charged NF membranes, which included using aqueous monomers/oligomers with more amine groups such as polyethylenimine (PEI), 8,22,23 using special organic solvents such as toluene for TMC, 24 and adding surfactants into either the aqueous or the organic phase. 25−27 The latter two approaches deliberately vary the diffusion rate of aqueous monomers into the organic phase, which normally is the ratecontrolling step for IP reactions.…”

Section: Introductionmentioning

confidence: 99%

“…In the literature, various approaches were adopted for preparing positively charged NF membranes, which included using aqueous monomers/oligomers with more amine groups such as polyethylenimine (PEI), ,, using special organic solvents such as toluene for TMC, and adding surfactants into either the aqueous or the organic phase. − The latter two approaches deliberately vary the diffusion rate of aqueous monomers into the organic phase, which normally is the rate-controlling step for IP reactions. The lowered diffusion rate, in turn, would probably affect the reaction behaviors between the monomers in the reaction zones.…”

Section: Introductionmentioning

confidence: 99%

Simultaneously Modulating Nanofiltration Membrane Surface Charges and Pore Size in Pursuit of Effective Cation Separation via a Bi-Functional Monomers-Interfered IP Reaction

Wang,

Gao,

Zhang

et al. 2024

ACS EST Eng.

View full text Add to dashboard Cite

Reducing the membrane surface negative charge density and properly enlarging the pore size could benefit the selective and efficient separation of divalent cations from monovalent cations desired by many applications (e.g., Li + /Mg 2+ separation) using nanofiltration (NF) by synergistically exploiting the Donnan and steric effects. This study provides a one-step tactic for the preparation of such membranes by simply introducing a small percentage of sulfuryl chloride (SO 2 Cl 2 ) into the organic phase of trimesoyl chloride (TMC). This method is adaptable to the classical interfacial polymerization (IP) technique. The key conditions include a sufficient high concentration of piperazine (PIP) in the aqueous phase (e.g., 2.0 wt %) and a low-to-medium concentration ratio of sulfuryl chloride to TMC. An as-prepared membrane, which manifested a high Li + / Mg 2+ selectivity of 22.2, exhibited a high rejection of MgCl 2 at 92%, a low rejection of Na 2 SO 4 at 34%, and a relatively high water permeance of 11.1 L m −2 h −1 bar −1 . We propose that the sulfuryl chloride monomers mainly played an interferential role rather than largely being incorporated into the polyamide matrix. This was demonstrated by the very low sulfur element composition in the active layer and the substantially enlarged membrane pore size in comparison to that of the control membrane. Adding sulfuryl chloride into the organic phase could allow more PIP monomers to diffuse through the enlarged structure to the superficial surface of the membrane, leaving more unreacted amine groups endowed with positive charges. Moreover, the addition of sulfuryl chloride could greatly change the membrane surface and structural morphologies, and in turn the surface roughness, by increasing the number of large ring-like structures and/or rougher nodules that could cover almost the entire membrane surface. Therefore, this work demonstrated that the membranes fabricated by the novel approach could have practical applications for cation separation.

show abstract

Positively charged nanofiltration membranes for efficient Mg2+/Li+ separation from high Mg2+/Li+ ratio brine

et al. 2023

View full text Add to dashboard Cite

Dual-electric layer nanofiltration membranes based on polyphenol/PEI interlayer for highly efficient Mg2+/Li+ separation

Cited by 42 publications

References 48 publications

Effect of Interlayer Construction on TFC Nanofiltration Membrane Performance: A Review from Materials Perspective

Effect of Interlayer Construction on TFC Nanofiltration Membrane Performance: A Review from Materials Perspective

Simultaneously Modulating Nanofiltration Membrane Surface Charges and Pore Size in Pursuit of Effective Cation Separation via a Bi-Functional Monomers-Interfered IP Reaction

Positively charged nanofiltration membranes for efficient Mg2+/Li+ separation from high Mg2+/Li+ ratio brine

Contact Info

Product

Resources

About