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Related Concept Videos

Osmosis00:47

Osmosis

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Approximately 60% to 95% of the weight of living organisms is attributed to water. Therefore, maintaining appropriate water balance within cells is of paramount importance. Osmosis is the movement of water across a semipermeable membrane, such as a cell’s plasma membrane. In living organisms, water plays a crucial role as a solvent—a molecule that dissolves other molecules.
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Osmosis is the movement of free water molecules through a semipermeable membrane.  The water's concentration gradient across the membrane is inversely proportional to the solutes' concentration. Whereas diffusion transports material across membranes and within cells, osmosis transports only water across a membrane, and the membrane limits the diffusion of solutes in the water. Osmosis is a special case of diffusion.
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A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, and so forth, are capable of passing through (permeating) the material. Biological cell membranes provide elegant examples of selective permeation in nature, while dialysis tubing used to remove metabolic wastes from blood is a more simplistic technological example. Regardless of how they may be fabricated, these materials are generally...
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When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
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Electro-Forward Osmosis.

Moon Son1, Taeyoung Kim2, Wulin Yang1

  • 1Department of Civil and Environmental Engineering , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States.

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|July 4, 2019
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Summary
This summary is machine-generated.

Electro-forward osmosis (EFO) uses an electrical field to drive ion migration, significantly boosting water flux in forward osmosis (FO) processes. This method enhances water transport by creating ion accumulation, reducing draw solute requirements.

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Area of Science:

  • Membrane Science and Technology
  • Electrochemistry
  • Water Treatment

Background:

  • Forward osmosis (FO) is a promising water separation technology.
  • Ion migration can influence water flux in FO processes.
  • Controlling ion behavior is key to optimizing FO performance.

Purpose of the Study:

  • To investigate the impact of electrical field-induced ion migration on water flux in a forward osmosis (FO) system.
  • To evaluate the effectiveness of electro-forward osmosis (EFO) using a thin-film composite (TFC) membrane.
  • To explore the potential of EFO for applications requiring minimal draw solute.

Main Methods:

  • Utilized a thin-film composite (TFC) membrane situated between two cation exchange membranes.
  • Applied a fixed current of 100 mA (1.7 mA cm⁻²) sustained by proton flux.
  • Employed a 34 mM NaCl feed solution and a 257 mM NaCl draw solution.

Main Results:

  • Proton transport lowered the pH of both draw and feed solutions.
  • Localized proton accumulation on the draw side created a high concentration polarization modulus (1.41 × 10⁵).
  • Achieved enhanced water flux (5.56 LMH at 100 mA) compared to the control (1.10 LMH without current).

Conclusions:

  • Electro-forward osmosis (EFO) effectively enhances water flux in FO processes through electrical field-induced ion accumulation.
  • The EFO system demonstrates potential for FO applications with limited draw solute usage.
  • Ion migration control via electrical fields offers a novel approach to improve FO efficiency.