A Charge-Enhanced Functionalized MWCNT/poly(m-Phenylene Isophthalamide) Ultrafiltration Membrane for Improved Ibuprofen Removal from Water

Le résumé fourni par la source

Functionalized multiwalled carbon nanotubes (f-MWCNTs) are attractive additions for ultrafiltration (UF) membrane blending modification due to their outstanding physicochemical properties and ease of manufacture. As a result, the impact of f-MWCNTs on the surface characteristics and microstructure of the charged UF membranes, as well as the possibility of a synergistic effect on the removal efficiency of typical micropollutants, makes this an interesting and practical topic to investigate. In this study, a charged poly( m -phenylene isophthalamide) (PMIA) composite UF membrane modified by f-MWCNTs was prepared using a one-step phase transformation method. The association between membrane microstructure and ibuprofen removal efficiency was further studied by varying the kinds of MWCNT functional groups and three critical membrane preparation parameters (f-MWCNT content, membrane thickness, and heat treatment duration). The findings revealed that a 0.2 wt % carboxylated MWCNT (c-MWCNT) loading was required to create membranes with excellent hydrophilicity, permeability, and ibuprofen (IBU) retention. The fluctuation in solution pH has a substantial influence on the membrane’s surface charge properties and IBU retention. The addition of c-MWCNT rendered the surface of the PMIA composite membrane more negatively charged than the pristine PMIA membrane, and the improved electrostatic exclusion effect resulted in an approximately 4-fold improvement in IBU retention (from 11% to 43%) in the pH range of 3–9. This study presents a simple and practical strategy for creating a negatively charged and antipollution PMIA composite UF membrane incorporating f-MWCNTs, which is regarded as a promising option for reducing the environmental impact of pharmaceuticals in safe drinking water treatment and the production of high-quality reusable water.

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