AI Article Synopsis
- Researchers developed an ultrathin zwitterionic hydrogel nanolayer on polysulfone ultrafiltration membranes to improve surface water purification while addressing membrane fouling and energy efficiency.
- The modified membranes exhibited enhanced resistance to biological fouling from substances like bovine serum albumin and harmful bacteria, outperforming standard membranes through both foulant repulsion and antimicrobial properties.
- In practical applications, the hydrogel layer led to a significant increase in dissolved organic carbon removal and water flow stability, suggesting a promising method for controlling biofouling in low-energy water treatment processes.
Article Abstract
Ultralow-pressurized ultrafiltration membrane process with low energy consumption is promising in surface water purification. However, membrane fouling and low selectivity are significant barriers for the wide application of this process. Herein, an ultrathin zwitterionic hydrogel nanolayer was in-situ grown on polysulfone ultrafiltration membrane surface through interfacially-initiated free radical polymerization. The hydrogel-modified membrane possessed improved biological fouling resistance during the dynamic filtration process (bovine serum albumin, Escherichia coli and Staphylococcus aureus), comparing with commercial polysulfone membrane. The enhanced biofouling resistance ability of zwitterionic hydrogel nanolayer was derived from the foulant repulsion of hydration shell and the bactericidal effect of quaternary ammonium, according to the results of foulant-membrane interaction energy analyses and antibacterial performances. In surface water treatment, the zwitterionic hydrogel layer inhibited biofouling and resulted in the formation of a loose and thin biofilm. In addition, the hydrogel-modified membrane possessed 22% improvement in dissolved organic carbon (DOC) removal and 134% increasement in stable water flux, compared to commercial polysulfone membrane. The in-situ grown zwitterionic hydrogel nanolayer on membrane surface offers a prospectively alternative for biofouling control in ultralow-pressurized membrane process.
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| http://dx.doi.org/10.1016/j.watres.2024.121263 | DOI Listing |
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