Customizing surface grafting and interlayer functionalization for PFOA separation in polyamide membranes

Customizing surface grafting and interlayer functionalization for PFOA separation in polyamide membranes

Emerging contaminants, such as per- and polyfluoroalkyl substances (PFAS), pose significant challenges to ensuring a clean drinking water supply. This study evaluates various fabrication techniques for incorporating silver-based metal-organic frameworks (Ag-MOFs) into polyamide (PA) nanofiltration (...

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Main Authors: Mohsen Pilevar, Hesam Jafarian, Nima Behzadnia, Qiaoli Liang, Sanam Etemadi Maleki, Sadegh Aghapour Aktij, Mohtada Sadrzadeh, Leigh Terry, Mark Elliott, Mostafa Dadashi Firouzjaei
Format: Article
Language:English
Published: Elsevier 2025-05-01
Series:Water Research X
Subjects:
PFAS
Wastewater treatment
Metal-organic framework (Ag-MOF)
Thin-film nanocomposite (TFN) membranes
Fouling
Nanofiltration
Online Access:http://www.sciencedirect.com/science/article/pii/S258991472500057X
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Summary:Emerging contaminants, such as per- and polyfluoroalkyl substances (PFAS), pose significant challenges to ensuring a clean drinking water supply. This study evaluates various fabrication techniques for incorporating silver-based metal-organic frameworks (Ag-MOFs) into polyamide (PA) nanofiltration (NF) membranes to enhance perfluorooctanoic acid (PFOA) separation and anti-fouling performance. Various characterizations, including scanning and transmission electron microscopy, carboxylic group density, molecular weight cut-off (MWCO) measurements, and zeta potential analyses revealed that each method imparts distinct physicochemical and morphological characteristics to the modified membranes. Among all fabricated membranes, the interlayered Ag-MOFs (UI-MOF) obtained the highest permeance (13.7 Lm−2h−1bar−1) but the lowest PFOA rejection (88.9 %), likely due to its loose PA network with large MWCO (522 Da) and high carboxylic group density (82.0 sites/nm2). In contrast, the dip-coating surface-grafted Ag-MOFs (DS-MOF) achieved the highest PFOA rejection (93.4 %), attributed to its narrow pores (average pore diameter of 10 Å ± 0.06). Additionally, all modified membranes showed superior anti-fouling performance (flux recovery ratio > 94.0 %) compared to the Blank PA membrane, likely due to the improved surface hydrophilicity of the modified membranes.
ISSN:2589-9147

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