Ionic liquid-mediated integration of NM88B in PVDF membranes: Synergistic enhancement of permeability and photocatalytic performance
2025
Offei Charity | Yu Liu | Shusu Shen | Xiaoji Zhou | Ji Ma | Zhenfeng Lin | Yongfu Guo
NH2-MIL-88B (Fe) (NM88B), a promising photocatalyst for wastewater remediation, is hindered by particle agglomeration and unsustainable solvent usage in membrane fabrication. In this study, a green approach was developed through the integration of ionic liquid (IL) as a co-solvent, which effectively enhanced NM88B dispersion in PVDF membranes while addressing environmental concerns. By systematic optimization of IL content (up to 24.9 wt%) and NM88B loading (up to 2.0 wt%), MOF aggregation was suppressed. A 13.5 % increase in bulk porosity and enlarged pore size (0.804 μm to 1.587 μm) were achieved through IL-mediated blending, and the optimal membrane (M2) demonstrated improved permeation flux (enhanced from ∼21.05 to >77.19 L·m−2·h−1·bar−1) and mechanical strength (3.53 MPa). Notably, NM88B enrichment was found to impart photocatalytic self-cleaning capability, with stable permeation flux and rejection rates maintained over three operational cycles. This work establishes a dual-functional membrane design platform, reconciling high permeability, antifouling resilience, and structural robustness via sustainable IL-MOF synergy for advanced water treatment applications.
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