Polyamide composite membrane with 3D honeycomb-like structure via acetone-regulated interfacial polymerization for high-efficiency organic solvent nanofiltration

Fu, Wenming; Deng, Luyao; Hu, Mengyang; Mai, Zhaohuan; Xu, Guiyin; Shi, Yongxuan; Guan, Kecheng; Gonzales, Ralph Rolly; Matsuoka, Atsushi; Matsuyama, Hideto

doi:10.1016/j.memsci.2023.121711

Cited by 19 publications

(2 citation statements)

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“…The membrane selectivity is greatly influenced by the structure and chemistry (e.g., pore size and surface charge) of its polyamide layer. 7,8 To date, several strategies have been applied to tailor IP for regulating the structure and chemistry of polyamide nanofilms toward better membrane selectivity, 9−11 such as cosolvent addition 12,13 and nanofiller incorporation. 14,15 For example, some studies applied cosolvents (e.g., acetone 16,17 and ethyl acetate 18,19 ) to regulate the IP reaction to shape polyamide morphology 20 and/or tailor the cross-linking degree.…”

Section: Introductionmentioning

confidence: 99%

“…To date, several strategies have been applied to tailor IP for regulating the structure and chemistry of polyamide nanofilms toward better membrane selectivity, − such as cosolvent addition , and nanofiller incorporation. , For example, some studies applied cosolvents (e.g., acetone , and ethyl acetate , ) to regulate the IP reaction to shape polyamide morphology and/or tailor the cross-linking degree . Some works incorporated porous metal–organic frameworks and/or nonporous nanoparticles during IP reaction to create selective channels toward high membrane performance.…”

Section: Introductionmentioning

confidence: 99%

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Precise Regulation of Monomer Reactive Sites Enhances the Water Permeance and Membrane Selectivity of Polyamide Nanofiltration Membranes

Jiang,

Long,

Peng

et al. 2023

Ind. Eng. Chem. Res.

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Polyamide structure and chemistry play critical roles in the separation performance of thin-film composite (TFC) nanofiltration (NF) membranes. Typically, polyamide formation is based on the reactive sites on monomers (e.g., amino groups on piperazine (PIP)) during interfacial polymerization (IP). To precisely tailor polyamide properties (e.g., cross-linking degree) and membrane performance, we regulated PIP reactive sites by pH adjustment to vary the dominant species in forms of non-, mono-, and diprotonated PIP. Specifically, at pH values between pK a1 (i.e., 5.3) and pK a2 (i.e., 9.7), the dominant monoprotonated PIP with relatively fewer nonprotonated PIP resulted in a reduced cross-linking degree of polyamide. Such reduced cross-linked polyamide exhibited simultaneously improved water permeance and better solute-to-solute selectivity (e.g., CaCl2/Na2SO4 and CaCl2/PFOS selectivity), thanks to their looser structure and more negative charge. For example, membrane NF-pH9, prepared at pH 9, exhibited simultaneously improved water permeance (20.2 L m–2 h–1 bar–1) and higher CaCl2/PFOS selectivity (12.6). The dominant diprotonated PIP with little nonprotonation at pH < pK a1 resulted in ineffective cross-linked polyamide with low salt rejection (e.g., 0.9 ± 0.3% of Na2SO4). This study investigated a facile strategy to tailor membrane permeance and selectivity by regulating monomer reactive sites, which provides new insights into the development of high-performance NF membranes.

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