Efficacy of CNT-bound polyelectrolyte membrane by spray-assisted layer-by-layer (LbL) technique on water purification


LIU L., SON M., PARK H., Celik E., BHATTACHARJEE C., CHOI H.

RSC ADVANCES, vol.4, no.62, pp.32858-32865, 2014 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 4 Issue: 62
  • Publication Date: 2014
  • Doi Number: 10.1039/c4ra05272b
  • Journal Name: RSC ADVANCES
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.32858-32865

Abstract

This study demonstrates the properties of surface-modified polyethersulfone (PES) composite ultrafiltration (UF) membranes prepared by a spray-assisted layer-by-layer (LbL) technique. The coating layers on the PES substrate consist of polyelectrolyte multilayers (PEMs) with and without functionalized multiwall carbon nanotubes (f-MWCNTs) as the blending additive. The composite membrane acquired a negative surface charge and the hydrophilicity of the membrane increased after adding hydrophilic f-MWCNTs. The pure water permeation tests revealed that the water flux was dependent on the f-MWCNTs/polyelectrolyte weight ratio and the number of PEMs. The prepared membrane showed slower flux reduction and lower fouling ratio (R-t) by humic acid (HA) filtration tests. Moreover, the flux recovery ratio (FRR) after deionized (DI) water flushing was improved significantly (up to 81%) compared with the PES substrate (46%), which indicated the enhancement of anti-fouling properties. The current work presents a facile way to modify the commercial membrane surface with tuned water flux and enhanced anti-fouling properties.