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Related Concept Videos

Dialysis01:15

Dialysis

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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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Nanofiltration Membrane with a Mussel-Inspired Interlayer for Improved Permeation Performance.

Xi Yang1, Yong Du1, Xi Zhang1

  • 1MOE Key Laboratory of Macromolecular Synthesis and Functionalization and Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science & Engineering, Zhejiang University , Hangzhou 310027, China.

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|February 12, 2017
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Summary

A novel mussel-inspired interlayer enhances thin-film composite nanofiltration membranes (NFMs). This modification improves water flux and maintains high salt rejection, offering better performance for water purification.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Thin-film composite (TFC) nanofiltration membranes (NFMs) are crucial for water purification.
  • Interfacial polymerization is key to TFC NFM performance.
  • Controlling interfacial polymerization is essential for optimizing membrane properties.

Purpose of the Study:

  • To develop a mussel-inspired interlayer for TFC NFMs.
  • To tune interfacial polymerization using polydopamine (PDA)/polyethylenimine (PEI).
  • To enhance water flux and salt rejection of NFMs.

Main Methods:

  • Codeposition of PDA/PEI interlayer on ultrafiltration substrate.
  • Tuning interfacial polymerization of piperazine and trimesoyl chloride.
  • Characterization using ATR/IR, XPS, FESEM, AFM, zeta potential, and contact angle measurements.

Main Results:

  • Hydrophilic PDA/PEI interlayer enhances piperazine adsorption via capillary effect.
  • Prepared TFC NFMs exhibit thin and smooth polyamide selective layers.
  • Water permeation flux doubled, with high Na2SO4 rejection (97%).

Conclusions:

  • The mussel-inspired interlayer effectively tunes interfacial polymerization.
  • Enhanced TFC NFMs show significantly improved water flux.
  • The developed membranes offer excellent salt rejection performance for water treatment.