PMID- 35822195
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20220716
IS  - 2690-0637 (Electronic)
IS  - 2690-0637 (Linking)
VI  - 2
IP  - 5
DP  - 2022 May 13
TI  - Dual-Functional Nanofiltration and Adsorptive Membranes for PFAS and Organics 
      Separation from Water.
PG  - 863-872
LID - 10.1021/acsestwater.2c00043 [doi]
AB  - Challenges associated with water separation technologies for per- and 
      polyfluoroalkyl substances (PFASs) require efficient and sustainable processes 
      supported by a proper understanding of the separation mechanisms. The solute 
      rejections by nanofiltration (NF) at pH values near the membrane isoelectric 
      point were compared to the size- and mass-transfer-dependent modeled rejection 
      rates of these compounds in an ionized state. We find that the low pK (a) value 
      of perfluorooctanoic acid (PFOA) relates to enhanced solute exclusions by 
      minimizing the presence and partitioning of the protonated organic compound into 
      the membrane domain. The effects of Donnan exclusion are moderate, and co-ion 
      transport also contributes to the PFAS rejection rates. An additional support 
      barrier with thermo-responsive (quantified by water permeance variation) 
      adsorption/desorption properties allows for enhanced separations of PFAS. This 
      was possible by successfully synthesizing an NF layer on top of a 
      poly-N-isopropylacrylamide (PNIPAm) pore-functionalized microfiltration support 
      structure. The support layer adsorbs organics (178 mg PFOA adsorbed/m(2) membrane 
      at an equilibrium concentration of 70 mg/L), and the simultaneous exclusion from 
      the NF layer allows separations of PFOA and the smaller sized heptafluorobutyric 
      acid from solutions containing 70 mug/L of these compounds at a high water flux of 
      100 L/m(2)-h at 7 bar.
FAU - Leniz-Pizarro, Francisco
AU  - Leniz-Pizarro F
AUID- ORCID: 0000-0003-4635-7139
AD  - Department of Chemical and Materials Engineering, University of Kentucky, 
      Lexington, Kentucky 40506, United States.
FAU - Vogler, Ronald J
AU  - Vogler RJ
AUID- ORCID: 0000-0002-8683-9100
AD  - Department of Chemical and Materials Engineering, University of Kentucky, 
      Lexington, Kentucky 40506, United States.
FAU - Sandman, Phillip
AU  - Sandman P
AD  - Department of Chemical and Materials Engineering, University of Kentucky, 
      Lexington, Kentucky 40506, United States.
FAU - Harris, Natalie
AU  - Harris N
AD  - Department of Chemical and Materials Engineering, University of Kentucky, 
      Lexington, Kentucky 40506, United States.
FAU - Ormsbee, Lindell E
AU  - Ormsbee LE
AD  - Department of Civil Engineering, University of Kentucky, Lexington, Kentucky 
      40506, United States.
FAU - Liu, Chunqing
AU  - Liu C
AD  - Membranes R&D Group, Honeywell UOP, Des Plaines, Illinois 60016, United States.
FAU - Bhattacharyya, Dibakar
AU  - Bhattacharyya D
AUID- ORCID: 0000-0001-9948-9085
AD  - Department of Chemical and Materials Engineering, University of Kentucky, 
      Lexington, Kentucky 40506, United States.
LA  - eng
GR  - P42 ES007380/ES/NIEHS NIH HHS/United States
PT  - Journal Article
DEP - 20220408
PL  - United States
TA  - ACS ES T Water
JT  - ACS ES&T water
JID - 101778136
PMC - PMC9273029
MID - NIHMS1803046
OTO - NOTNLM
OT  - PFAS
OT  - organic anions
OT  - responsive materials
OT  - water treatment
COIS- The authors declare no competing financial interest.
EDAT- 2022/07/14 06:00
MHDA- 2022/07/14 06:01
PMCR- 2022/07/11
CRDT- 2022/07/13 02:16
PHST- 2022/07/13 02:16 [entrez]
PHST- 2022/07/14 06:00 [pubmed]
PHST- 2022/07/14 06:01 [medline]
PHST- 2022/07/11 00:00 [pmc-release]
AID - 10.1021/acsestwater.2c00043 [doi]
PST - ppublish
SO  - ACS ES T Water. 2022 May 13;2(5):863-872. doi: 10.1021/acsestwater.2c00043. Epub 
      2022 Apr 8.