AI Article Synopsis
- Pressure-driven ultrafiltration membranes are crucial for effective separation in various applications, and there's a need for advanced membranes that balance high permeance with excellent rejection rates.
- Researchers have developed graphene oxide ultrafiltration membranes featuring nanochannels (3-5 nm in size) that dramatically improve permeance by 10 times while maintaining a high rejection rate, significantly outperforming commercial options.
- The unique design allows for tunable separation properties through pressure-dependent behavior, suggesting broader applications for enhancing water purification processes across different membrane types.
Article Abstract
Pressure-driven ultrafiltration membranes are important in separation applications. Advanced filtration membranes with high permeance and enhanced rejection must be developed to meet rising worldwide demand. Here we report nanostrand-channelled graphene oxide ultrafiltration membranes with a network of nanochannels with a narrow size distribution (3-5 nm) and superior separation performance. This permeance offers a 10-fold enhancement without sacrificing the rejection rate compared with that of graphene oxide membranes, and is more than 100 times higher than that of commercial ultrafiltration membranes with similar rejection. The flow enhancement is attributed to the porous structure and significantly reduced channel length. An abnormal pressure-dependent separation behaviour is also reported, where the elastic deformation of nanochannels offers tunable permeation and rejection. The water flow through these hydrophilic graphene oxide nanochannels is identified as viscous. This nanostrand-channelling approach is also extendable to other laminate membranes, providing potential for accelerating separation and water-purification processes.
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| http://dx.doi.org/10.1038/ncomms3979 | DOI Listing |
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