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Published on: October 11, 2016
The influence of surface coating on PFAS filter performance.
Luke Skala1, James K Johnson1, Danielle Nachman1
1Applied Physics Laboratory, Johns Hopkins University, 11100 Johns Hopkins Road, Laurel, Maryland 20723, USA.
Shorter polyethylene glycol (PEG) segments on silane-functionalized membranes improve per- and poly-fluoroalkyl substances (PFAS) capture, especially for short-chain contaminants. This molecular design enhances filter performance in PFAS-contaminated water.
Area of Science:
- Materials Science
- Environmental Engineering
- Chemical Engineering
Background:
- Per- and poly-fluoroalkyl substances (PFAS) are persistent environmental contaminants.
- Functionalized membranes are crucial for effective PFAS removal from water.
- Optimizing molecular design of functionalization agents is key to improving filtration performance.
Purpose of the Study:
- To synthesize and test novel silane molecules with varying polyethylene glycol (PEG) segment lengths for membrane functionalization.
- To evaluate the impact of PEG segment length on the capture efficiency of per- and poly-fluoroalkyl species (PFAS) from contaminated water.
- To elucidate the molecular interactions governing PFAS capture using experimental and computational methods.
Main Methods:
- Synthesis of amphiphilic silane molecules with varied PEG segment lengths.
- Dynamic filtration experiments using aluminum-oxide hydroxide membranes functionalized with silanes.
- Molecular dynamics simulations with metadynamics sampling to determine free-energy interaction profiles.
Main Results:
- Membranes functionalized with silanes featuring shorter PEG segments demonstrated superior performance in capturing PFAS, particularly short-chain variants.
- Molecular dynamics simulations revealed that PEG length influences PFAS-brush interaction strength and surface coating density.
- Both experimental and simulation data indicated that molecular architecture and membrane processing significantly impact overall filter performance.
Conclusions:
- The length of the polyethylene glycol (PEG) segment in silane functionalization agents is a critical factor for optimizing membrane performance in PFAS removal.
- A shorter PEG segment enhances the capture of per- and poly-fluoroalkyl species (PFAS), especially low molecular-weight ones.
- Combined experimental and simulation approaches provide valuable insights into designing advanced materials for effective contaminant remediation.
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