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Ultrafast, Stable Ionic and Molecular Sieving through Functionalized Boron Nitride Membranes.
Cheng Chen1, Si Qin1,2, Dan Liu1
1Institute for Frontier Materials , Deakin University , Locked Bag 2000 , Geelong , Victoria 3220 , Australia.
ACS Applied Materials & Interfaces
|July 19, 2019
Summary
Functionalized boron nitride (FBN) membranes offer efficient water purification by blocking large solutes while allowing rapid ion permeation. These nanometer-thick membranes demonstrate remarkable stability in harsh chemical conditions, enhancing separation technologies.
Area of Science:
- Materials Science
- Nanotechnology
- Separation Science
Background:
- Porous membranes are crucial for separation technologies like water purification and gas separation.
- Ideal membranes require thinness for speed, precise pore sizes for selectivity, and chemical stability.
- Existing membranes face limitations in performance and stability under diverse conditions.
Purpose of the Study:
- To develop and characterize novel nanometer-thick membranes from functionalized boron nitride (FBN) for advanced separation applications.
- To evaluate the permeation performance and selectivity of FBN membranes for ions and solutes.
- To assess the chemical stability and potential of FBN membranes in challenging environments.
Main Methods:
- Fabrication of nanometer-thick membranes via vacuum filtration of functionalized boron nitride (FBN) water suspensions.
- Characterization of membrane pore size and solute rejection capabilities, specifically blocking solutes >4.3 Å hydrated radii.
- Evaluation of ion permeation rates and comparison with theoretical diffusion and other membrane types (e.g., graphene oxide).
- Assessment of membrane stability in acidic, alkaline, and salt solutions.
- Molecular dynamics simulations to elucidate the mechanism of high permeation performance.
Main Results:
- FBN membranes effectively block solutes with hydrated radii larger than 4.3 Å.
- FBN membranes exhibit ultrahigh ion permeation rates, 25-fold higher than theoretical diffusion rates.
- Exceptional chemical stability demonstrated in acidic, alkaline, and salt solutions.
- Molecular dynamics simulations confirm nanocapillaries within hydrated FBN membranes are key to performance.
Conclusions:
- Nanometer-thick FBN membranes fabricated by simple vacuum filtration offer angstrom-sized channels for ultrafast ion permeation.
- These membranes show significant potential for applications in barrier separation and water purification due to their high performance and stability.
- FBN membranes represent a promising advancement over existing technologies like graphene oxide membranes.
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