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Related Concept Videos

Dialysis01:15

Dialysis

561
Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
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Detergent Purification of Membrane Proteins01:18

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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Updated: May 23, 2025

Proof-of-Concept for Gas-Entrapping Membranes Derived from Water-Loving SiO2/Si/SiO2 Wafers for Green Desalination
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Gradient-Pore-Engineered Janus Membranes for Sequential Molecular Sieving in Membrane Desalination.

Zhigao Zhu1, Mengya Yuan1, Miao He1

  • 1Key Laboratory of New Membrane Materials, Ministry of Industry and Information Technology, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China.

Environmental Science & Technology
|May 22, 2025
PubMed
Summary

This study introduces a novel membrane for hypersaline wastewater desalination. The new design enhances water flux and pollutant rejection, offering a promising solution for advanced thermal desalination technologies.

Keywords:
asymmetric Janus membranesgradient poresinterfacial polymerizationmembrane desalinationsequential molecular sieving

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Membrane distillation (MD) is promising for hypersaline wastewater desalination.
  • Existing MD membranes struggle to reject both volatile and nonvolatile pollutants simultaneously.
  • Treating complex industrial wastewater requires advanced membrane solutions.

Purpose of the Study:

  • To develop an advanced membrane for efficient hypersaline wastewater desalination.
  • To investigate the role of a novel interlayer in membrane performance.
  • To address the limitations of current membrane technologies in pollutant rejection.

Main Methods:

  • Fabrication of asymmetric Janus membranes with gradient pores using electrospun PVDF, graphene oxide (GO), and m-phenylenediamine (MPD).
  • Sequential vacuum filtration and interfacial polymerization to form an ultrathin polyamide (PA) layer.
  • Systematic investigation of the PA@MPD-GO configuration's structural properties and transport behavior.

Main Results:

  • The MPD-GO interlayer reduced water mass transfer resistance and enabled the formation of a ~9 nm ultrathin PA layer.
  • Achieved high water flux (63 L m⁻² h⁻¹) under a 40 °C temperature gradient.
  • Demonstrated 97.55% rejection of volatile phenylamine with excellent antifouling, antiwetting, and antiscaling properties.

Conclusions:

  • The developed gradient membrane design offers a promising approach for advanced thermal desalination.
  • The thermo-osmosis-evaporation (TOE) system shows potential for treating hypersaline wastewater in complex scenarios.
  • This technology advances membrane-based solutions for challenging water treatment applications.