Enhanced Polyimide–Graphene Oxide Nanofiltration Membranes for High‐Efficiency Separations of Inorganic Salts and Organic Dyes

Journal of Applied Polymer Science, Journal Year: 2025, Volume and Issue: unknown

Published: April 5, 2025

ABSTRACT Polyimide (PI) nanofiltration (NF) membranes have garnered significant attention in water purification due to superior separation efficiency and stability. This study presents the fabrication of PI/graphene oxide (GO) NF through a non‐solvent‐induced phase inversion process, specifically for separations inorganic salts organic dyes. The chemical structures PI‐GO are characterized using Fourier transform infrared spectroscopy (FT‐IR) X‐ray photoelectron (XPS), their properties examined zeta potential measurements, contact angle tests, thermogravimetric analysis. incorporation GO significantly enhances hydrophilicity membranes, subsequently optimizing capabilities. Filtration experiments demonstrate that addition notably increases permeance PI substantially rejects negatively charged dyes such as Coomassie Brilliant Blue (CBB), Congo Red (CR), Direct Black 38 (DB38). Moreover, exhibit excellent salt ions while effectively removing Notably, also display remarkable performance with hot (50°C 90°C) CBB/Na 2 SO 4 feed solutions, indicating robust thermal These findings suggest hold substantial promise field technology, owing exceptional performance.

Language: Английский

Effects of Latent Solvent Content on Tuning the Nanofiltration Performance of Nanofibrous Composite Membranes

Membranes, Journal Year: 2025, Volume and Issue: 15(4), P. 118 - 118

Published: April 8, 2025

This study aims to optimize the application of electrospun nanofibrous substrates in thin-film composite (TFC) nanofiltration (NF) membranes for enhanced liquid separation efficiency by employing a method effective welding between fibers using latent solvents. Polyacrylonitrile (PAN) nanofiber were fabricated via electrospinning, and dense polyamide selective layer was formed on their surface through interfacial polymerization (IP). The investigation focused effects different solvent systems, particularly role dimethyl sulfoxide (DMSO) as solvent, nanostructure final membrane performance. results indicate that increasing DMSO content can enhance greenness fabrication process, substrate hydrophilicity, mechanical strength, while also influencing thickness morphology layer. At rate 30%, achieves optimal pure water permeability high rejection rates; when exceeds 40%, structural inhomogeneity leads an increase defects, significantly deteriorating These findings provide theoretical insights technical guidance electrospinning technology designing efficient stable NF membranes.

Language: Английский

Sodium dodecylbenzene sulfonate (SDBS) assisted interfacial polymerization on a macro-porous nanofibrous support layer to prepare high-performance forward osmosis membranes

Desalination, Journal Year: 2025, Volume and Issue: unknown, P. 118989 - 118989

Published: May 1, 2025

Language: Английский