Polyamide/polyethylene thin film composite (PA/PE-TFC) NF membranes prepared from reverse-phase interface polymerization (RIP) for improved Mg(II)/Li(I) separation

Wang, Qingyi; Dong, Yongping; Ma, Jie; Wang, Huimin; Xue, Xuping; Bai, Chaojie; Lin, Mingjie; Luo, Lingping; Gao, Congjie; Xue, Lixin

doi:10.1016/j.desal.2023.116463

Cited by 32 publications

(2 citation statements)

References 50 publications

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“…The permeance of the TFNC nanofiltration membranes is about 24% higher than that of the TFC nanofiltration membranes at a similar rejection (Figure S8). Besides, we compared the nanofiltration performance of the TFNC membranes with some nanofiltration membranes reported in other literature and commercial nanofiltration membranes. − TFNC membranes prepared in this work exhibit competitively higher permeance at a similar rejection (Figure a and Table S5). To further evaluate the filtration performance of the TFNC membranes, the long-term stability was investigated.…”

Section: Resultsmentioning

confidence: 91%

High Permeance Polyamide Nanofiltration Membranes Based on Poly(l-lactic acid) Electrospun Nanofibrous Membranes with Controlled Hydrophilicity

Yu,

Li,

Lin

et al. 2024

ACS Appl. Nano Mater.

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Nanofiltration (NF) membranes have aroused great attention in recent years. The most commonly used NF membranes are polyamide (PA) thin-film composite (TFC) membranes based on ultrafiltration membranes. Owing to the high porosity and interconnected pores, electrospun nanofibrous membranes are promising substrates for the fabrication of high-flux nanofiltration membranes, i.e., thin-film nanofibrous composite (TFNC) nanofiltration membranes. In this work, poly(l-lactic acid) (PLLA) nanofibrous membranes with adjustable hydrophilicity were successfully fabricated, and then, a PA layer was synthesized on the surface via the interfacial polymerization between piperazine (PIP) and trimesoyl chloride (TMC). The hydrophilicity of PLLA nanofibrous membranes influences the distribution and adsorption weight of PIP, which further affects the formation and morphology of the PA layer. Results indicate that, as the hydrophilicity of PLLA nanofibrous membranes increases, the adsorption amount of PIP increases, the thickness of the PA layer decreases, and the cross-linking degree increases, which ensures both high permeance and high rejection to Na2SO4. The TFNC membranes exhibit a water permeance of 17.0 L·m–2·h–1·bar–1 and a Na2SO4 rejection of 98.0%. This work achieves the control of substrate hydrophilicity by introducing hydrophilic additives and provides new insights for the fabrication of high-performance nanofiltration membranes.

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Section: Resultsmentioning

confidence: 91%

High Permeance Polyamide Nanofiltration Membranes Based on Poly(l-lactic acid) Electrospun Nanofibrous Membranes with Controlled Hydrophilicity

Yu,

Li,

Lin

et al. 2024

ACS Appl. Nano Mater.

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“…Furthermore, we compared TFC membranes prepared in this work with some other nanofiltration membranes reported in other literature studies (Figure b). − Most TFC membranes fabricated on ultrafiltration substrates or other traditional substrates show lower water permeation flux. The present membranes show relatively high water permeation flux of 16.0–21.2 L/m 2 ·h·bar and high Na 2 SO 4 rejection above 95% simultaneously, demonstrating that the TFC membranes fabricated on co-deposited MPPMs have great nanofiltration performance.…”

Section: Resultsmentioning

confidence: 96%

Interface Engineering of Microporous Polypropylene Membranes for Polyamide Thin-Film Composite Nanofiltration Membranes with Robust Structure and Superior Performance

Zhu

et al. 2023

ACS Appl. Polym. Mater.

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Nanofiltration membranes have been widely used in many fields owing to their high separation efficiency and low energy assumption. However, traditional substrates for thin-film composite (TFC) nanofiltration membranes, such as polysulfone or polyethersulfone ultrafiltration membranes, suffer from low surface porosity and poor stability in organic solvents. A microporous polypropylene membrane (MPPM) possesses high organic solvent resistance, high porosity, but poor hydrophilicity. Herein, MPPMs were surface hydrophilized for the preparation of TFC membranes by interfacial polymerization. A green, fast, and stable deposition system based on ferulic acid and Fe3+ was employed for surface hydrophilization of MPPM, and thus, the aqueous solution of piperazine can homogeneously distribute on the substrate surface, which was directly visualized by confocal laser scanning microscopy. The nanofiltration membranes show rejection of 98.1% to Na2SO4 and water permeation flux of about 16 L/m2·h·bar. Moreover, the membranes are stable in a variety of common organic solvents, demonstrating the potential in organic solvent nanofiltration. The proposed strategy expands the selection of porous substrates for interfacial polymerization and harsh application environments for nanofiltration.

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Charge‐Sign‐Independent Separation of Mono‐ and Divalent Ions With Nanofiltration Membranes

Xu,

Duan,

et al. 2024

Adv Funct Materials

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Achieving precise selective separation of monovalent and divalent cations, as well as anions, is vital yet challenging in practical applications involving complex component treatments. Current membranes are typically effective for separating either cation pairs or anion pairs. To address this issue, a straightforward strategy for fabricating a nanofiltration (NF) membrane is developed that selectively permeates monovalent ions. This study focused on neutralizing the surface charge and tuning the pore size distribution of the polyamide membranes through a secondary interfacial polymerization using a zwitterionic copolymer consisting of 2‐methacryloyloxyethyl phosphorylcholine and 2‐aminoethyl methacrylate hydrochloride. The optimized NF membrane prepared in this study, with a near‐neutrally charged membrane surface and appropriate pore size distribution, demonstrates favorable performance in precisely separating monovalent and divalent ions, irrespective of the ion charge sign. The optimum NF membrane features high selectivity for both Cl−/SO42− (93) and Li+/Mg2+ (67) ion pairs, along with high water permeance of 8.5 L m−2 h−1 bar−1, making it competitive with many reported membranes. This study offers new insights into the ion‐selective mechanisms of polyamide membranes for monovalent/divalent ions and may guide the development of advanced membranes with single‐solute selectivity.

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Polyamide/polyethylene thin film composite (PA/PE-TFC) NF membranes prepared from reverse-phase interface polymerization (RIP) for improved Mg(II)/Li(I) separation

Cited by 32 publications

References 50 publications

High Permeance Polyamide Nanofiltration Membranes Based on Poly(l-lactic acid) Electrospun Nanofibrous Membranes with Controlled Hydrophilicity

High Permeance Polyamide Nanofiltration Membranes Based on Poly(l-lactic acid) Electrospun Nanofibrous Membranes with Controlled Hydrophilicity

Interface Engineering of Microporous Polypropylene Membranes for Polyamide Thin-Film Composite Nanofiltration Membranes with Robust Structure and Superior Performance

Charge‐Sign‐Independent Separation of Mono‐ and Divalent Ions With Nanofiltration Membranes

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