Cross-linked boron nitride-piperazine amide thin film nanocomposite membranes for rejection and concentration of per- and poly-fluoroalkyl substances (PFAS)

Sara Abdikheibari, Kanagaratnam Baskaran, Rosanne Guijt, Weiwei Lei, Ludovic F. Dumée

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Per- and poly-fluoroalkyl substances (PFAS)-contaminated wastewaters present major public health risks given the PFAS thermo-chemical stability and its demonstrated adverse impacts on aquatic life, extended to the entire food chain. To date, remediation of PFAS-contaminated wastewaters have been mainly undertaken with poorly cost-effective strategies, involving multi-step processes. Advanced separation systems enabling the selective capture and concentration of PFAS must be developed. In this work, the potential of nanofiltration (NF) membranes to reject short chain length PFAS, potassium nonafluoro-1-butanesulfonate (C4F9SO3K), is demonstrated with both bare polymeric and amine functionalized-boron nitride BN(NH2) nanosheet-decorated membranes. The BN(NH2)-decorated membranes exhibited almost 1.04 times higher permeation upon C4F9SO3K filtration compared to the bare poly(piperazine amide) (PPA) membranes (53 versus 26 L m−2 h−1), while maintaining very high C4F9SO3K rejection levels above 93%. A commercial membrane exhibited similar permeation to BN(NH2)-decorated membrane, but only retained ∼65% of the C4F9SO3K. The improved filtration performance of the BN(NH2)-decorated membrane was rationalized based on advanced characterization results to its enhanced wettability and negative charge density, resulting in weak interactions between the C4F9SO3K and BN(NH2) nanosheets. This communication demonstrates the role and potential of fine surface modifications of NF membranes to support improved separation performance towards PFAS removal.

Original languageBritish English
Pages (from-to)425-432
Number of pages8
JournalEnvironmental Quality Management
Volume31
Issue number4
DOIs
StatePublished - 1 Jun 2022

Keywords

  • boron nitride nanosheets
  • improved filtration performance
  • nanofiltration (NF) membranes
  • Per- and poly-fluoroalkyl substances (PFAS)

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