Electro-forward osmosis

Moon Son, Taeyoung Kim, Wulin Yang, Christopher Aaron Gorski, Bruce Ernest Logan

Research output: Contribution to journalArticle

Abstract

The impact of ion migration induced by an electrical field on water flux in a forward osmosis (FO) process was examined using a thin-film composite (TFC) membrane, held between two cation exchange membranes. An applied fixed current of 100 mA (1.7 mA cm-2) was sustained by the proton flux through the TFC-BW membrane using a feed of 34 mM NaCl, and a 257 mM NaCl draw solution. Protons generated at the anode were transported through the cation exchange membrane and into the draw solution, lowering the pH of the draw solution. Additional proton transport through the TFC-BW membrane also lowered the pH of the feed solution. The localized accumulation of the protons on the draw side of the TFC-BW membrane resulted in high concentration polarization modulus of 1.41 × 105, which enhanced the water flux into the draw solution (5.56 LMH at 100 mA), compared to the control (1.10 LMH with no current). These results using this electro-forward osmosis (EFO) process demonstrated that enhanced water flux into the draw solution could be achieved using ion accumulation induced by an electrical field. The EFO system could be used for FO applications where a limited use of draw solute is necessary.

Original languageEnglish (US)
Pages (from-to)8352-8361
Number of pages10
JournalEnvironmental Science and Technology
Volume53
Issue number14
DOIs
StatePublished - Jul 16 2019

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Osmosis
osmosis
Composite membranes
membrane
Protons
Fluxes
Thin films
Cations
Water
ion exchange
Ions
Membranes
ion
water
solute
Ion exchange
Anodes
polarization
Polarization

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Son, Moon ; Kim, Taeyoung ; Yang, Wulin ; Gorski, Christopher Aaron ; Logan, Bruce Ernest. / Electro-forward osmosis. In: Environmental Science and Technology. 2019 ; Vol. 53, No. 14. pp. 8352-8361.
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Electro-forward osmosis. / Son, Moon; Kim, Taeyoung; Yang, Wulin; Gorski, Christopher Aaron; Logan, Bruce Ernest.

In: Environmental Science and Technology, Vol. 53, No. 14, 16.07.2019, p. 8352-8361.

Research output: Contribution to journalArticle

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AU - Kim, Taeyoung

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AU - Gorski, Christopher Aaron

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