Leveraging Janus Substrates as a Confined "Interfacial Reactor" to Synthesize Ultrapermeable Polyamide Nanofilms
Cheng-Ye Zhu1,2, Hao-Nan Li1, Bian-Bian Guo1
1MOE Engineering Research Center of Membrane and Water Treatment Technology, and Key Lab of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310058, China.
Research (Washington, D.C.)
|May 2, 2024
Summary
Janus porous substrates enable precise control over polyamide nanofilm synthesis, significantly enhancing water permeance and selectivity for advanced separation applications.
Area of Science:
- Materials Science
- Chemical Engineering
- Nanotechnology
Background:
- Porous substrates are used as interfacial reactors for polyamide composite membrane synthesis.
- Uniform wettability of conventional substrates limits the formation of thin, dense polyamide nanofilms with high performance.
Purpose of the Study:
- To develop Janus porous substrates for interfacial polymerization.
- To decouple monomer concentration from total amount using confined interfacial reactors.
- To improve polyamide nanofilm thickness, permeance, and selectivity.
Main Methods:
- Fabrication of Janus porous substrates via single-sided deposition of polydopamine/polyethyleneimine.
- Interfacial polymerization on Janus substrates to form polyamide nanofilms.
- Characterization of nanofilm thickness, water permeance, and salt rejection.
Main Results:
- Reduced polyamide nanofilm thickness from 88.4 nm to 3.8 nm.
- Significantly enhanced water permeance from 7.2 to 52.0 l/m²·h·bar.
- Maintained high sodium sulfate rejection (~96%).
Conclusions:
- Janus porous substrates act as effective confined interfacial reactors.
- The strategy enables precise control over monomer distribution and nanofilm formation.
- The developed membranes exhibit superior performance compared to conventional membranes and commercial products.
