TY - JOUR
T1 - Porous hydrophobic-hydrophilic Janus membranes for nondispersive membrane solvent extraction
AU - Rodrigues, Lydia N.
AU - Sirkar, Kamalesh K.
AU - Weisbrod, Kirk Ryan
AU - Ahern, John C.
AU - Beuscher, Uwe
N1 - Funding Information:
The authors gratefully acknowledge support for this research from NSF Awards IIP1034710, IIP 1822130. This research was carried out in the NSF Industry/University Cooperative Research Center for Membrane Science, Engineering and Technology that has been supported via two NSF Awards IIP1034710 and IIP-1822130. LR and KKS thank Celgard for providing the polypropylene membrane, 3M for making the Nylon membranes available and Millipore Sigma for providing the PVDF membranes. LR thanks CME Department at NJIT for partial support as a TA.
Funding Information:
The authors gratefully acknowledge support for this research from NSF Awards IIP1034710 , IIP 1822130 . This research was carried out in the NSF Industry/University Cooperative Research Center for Membrane Science, Engineering and Technology that has been supported via two NSF Awards IIP1034710 and IIP-1822130 . LR and KKS thank Celgard for providing the polypropylene membrane, 3M for making the Nylon membranes available and Millipore Sigma for providing the PVDF membranes. LR thanks CME Department at NJIT for partial support as a TA .
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/11/1
Y1 - 2021/11/1
N2 - Porous membranes having a particular wetting characteristic, hydrophobic or hydrophilic, are used for nondispersive membrane solvent extraction (MSX) where two immiscible phases flow on two sides of the membrane. The aqueous-organic phase interface across which solvent extraction/back extraction occurs remains immobilized on one surface of the membrane. This process requires the pressure of the phase not present in membrane pores to be either equal to or higher than that of the phase present in membrane pores; the excess phase pressure should not exceed a breakthrough pressure. In countercurrent MSX with significant flow pressure drop in each phase, this often poses a problem. To overcome this problem, flat porous Janus membranes were developed using either a base polypropylene (PP) or polyvinylidene fluoride (PVDF) or polyamide (Nylon) membrane, one side of which is hydrophobic and the other being hydrophilic. Such membranes were characterized using the contact angle, liquid entry pressure (LEP) and the droplet breakthrough pressure from each side of the membrane along with characterizations via scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR). Nondispersive solvent extractions were carried out successfully for two systems, octanol-phenol (solute)-water, toluene-acetone (solute)-water, with either flowing phase at a pressure higher than that of the other phase. The phenol extraction system had a high solute distribution coefficient whereas acetone prefers both phases almost identically. The potential practical utility of the MSX technique will be substantially enhanced via Janus MSX membranes.
AB - Porous membranes having a particular wetting characteristic, hydrophobic or hydrophilic, are used for nondispersive membrane solvent extraction (MSX) where two immiscible phases flow on two sides of the membrane. The aqueous-organic phase interface across which solvent extraction/back extraction occurs remains immobilized on one surface of the membrane. This process requires the pressure of the phase not present in membrane pores to be either equal to or higher than that of the phase present in membrane pores; the excess phase pressure should not exceed a breakthrough pressure. In countercurrent MSX with significant flow pressure drop in each phase, this often poses a problem. To overcome this problem, flat porous Janus membranes were developed using either a base polypropylene (PP) or polyvinylidene fluoride (PVDF) or polyamide (Nylon) membrane, one side of which is hydrophobic and the other being hydrophilic. Such membranes were characterized using the contact angle, liquid entry pressure (LEP) and the droplet breakthrough pressure from each side of the membrane along with characterizations via scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR). Nondispersive solvent extractions were carried out successfully for two systems, octanol-phenol (solute)-water, toluene-acetone (solute)-water, with either flowing phase at a pressure higher than that of the other phase. The phenol extraction system had a high solute distribution coefficient whereas acetone prefers both phases almost identically. The potential practical utility of the MSX technique will be substantially enhanced via Janus MSX membranes.
KW - Acetone extraction
KW - Hydrophobic-hydrophilic Janus membrane
KW - Membrane solvent extraction
KW - Phase pressures
KW - Phenol extraction
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U2 - 10.1016/j.memsci.2021.119633
DO - 10.1016/j.memsci.2021.119633
M3 - Article
AN - SCOPUS:85111237309
SN - 0376-7388
VL - 637
JO - Journal of Membrane Science
JF - Journal of Membrane Science
M1 - 119633
ER -