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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Membrane Fluidity01:23

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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Hierarchically Structured Porous Polyamide-Imide Membrane for Switchable Emulsion Separation.

Pengfei Zhang1, Bowen Li1,2, Ralph Rolly Gonzales1,3

  • 1Research Center for Membrane and Film Technology, Kobe University, Nada, Kobe, 657-8501, Japan.

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Summary

Researchers developed advanced membranes with switchable superwettability for efficient oily wastewater treatment. These novel membranes offer high performance and self-cleaning properties using a simple fabrication method.

Keywords:
hierarchically porous structureoil/water separationpolyamide‐imide porous membranesurface composition reorganizationswitchable superwettability

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Area of Science:

  • Materials Science
  • Environmental Science
  • Chemical Engineering

Background:

  • Advanced membranes are crucial for efficient oily wastewater treatment.
  • Designing membranes with switchable superwettability presents fabrication challenges.
  • Existing methods often require complex procedures or external energy input.

Purpose of the Study:

  • To develop a straightforward method for fabricating switchable superwettable membranes.
  • To investigate the performance of these membranes in treating various oil/water emulsions.
  • To demonstrate the potential for energy-efficient and self-cleaning wastewater treatment solutions.

Main Methods:

  • Fabrication of porous symmetric membranes using a one-step non-solvent-induced phase separation method with polyamide-imide (Torlon).
  • Utilizing surface chemical composition reorganization of amphiphilic polymers.
  • Characterization of surface properties including superamphiphilicity, underwater superoleophobicity, and underoil superhydrophobicity.

Main Results:

  • The developed membranes exhibit switchable superwettability, including superamphiphilicity in air and superoleophobicity/superhydrophobicity in water/oil.
  • Achieved ultrahigh permeance and separation efficiency for oil-in-water, water-in-oil, and crude oil/water emulsions via gravity-driven processes.
  • Demonstrated excellent antifouling and self-cleaning performance with stable operation over multiple cycles.

Conclusions:

  • A novel and scalable strategy for creating switchable superwettable membranes was successfully established.
  • The membranes offer a promising, energy-efficient solution for effective oily wastewater treatment.
  • This approach has broad potential applications in environmental remediation and beyond.