Fouling resistant nanofiltration membranes from self-assembled quaternary ammonium monomers
Year: 2025
Type: article
Abstract: Nanofiltration membranes with uniform and tunable pore sizes are highly sought after for wastewater treatment. Macromolecular organics and oily species are prevalent in wastewater streams and are challenging drivers of fouling that lead to decreased membrane performance. Efforts to reduce fouling therefore remain of interest in the development of new nanofiltration membranes. We report that nanostructured thin film composite membranes fabricated from a self-assembled mesophase of a polymerizable surfactant [2-(acryloyloxy)ethyl]dimethyl tetradecyl ammonium bromide (AETDAB) demonstrate excellent fouling resistance to protein solutions and oil-in-water emulsions. AETDAB lyotropic mesophases were cast atop a support membrane and crosslinked, forming hexagonally packed polymer cylinders arrayed in the plane of the membrane. The evenly spaced cylinders create channels with diameters of ∼1 nm that represent the transport limiting dimension for the system. The composite membranes showed outstanding antifouling characteristics, retaining ∼95 % of permeance over a 72-h period while completely rejecting a model organic foulant, bovine serum albumin (BSA). The membrane also demonstrated similarly strong fouling resistance during the filtration of oil-in-water emulsions, retaining ∼95 % of its permeance. The fouling resistance highlight the membrane's potential to be used for challenging nanofiltration applications, while retaining its performance over long periods of time. • Self-assembled NF membranes with ∼1 nm pores show high foulant rejection and excellent water flux. • Antifouling NF membrane achieved low irreversible fouling under harsh feed conditions. • Fouling characteristics of NF membrane evaluated under varying salt and pH conditions.
Source: Journal of Membrane Science
Authors: Junkyu Hwang, Na Kyung Kim, Chinedum O. Osuji
Institution: University of Pennsylvania
Language: English
Subfield: Water Science and Technology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,890
Funders: National Science Foundation, University of Pennsylvania, Materials Research Science and Engineering Center, Harvard University, Division of Materials Research, Division of Chemical, Bioengineering, Environmental, and Transport Systems, Division of Civil, Mechanical and Manufacturing Innovation, Army Research Office
OpenAlex ID: W4409413217