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Published on: August 16, 2012
A polymer membrane containing Fe(0) as a contaminant barrier
Tsutomu Shimotori1, Eric E Nuxoll, Edward L Cussler
1Department of Civil Engineering, University of Minnesota, 500 Pillsbury Drive Southeast, Minneapolis, Minnesota 55455, USA.
Environmental Science & Technology
|April 29, 2004
Summary
Poly(vinyl alcohol) membranes with embedded iron (Fe(0)) particles significantly enhance contaminant containment. These Fe(0)/PVA membranes show over 100-fold increased lag time for copper and carbon tetrachloride, demonstrating potential for practical barriers.
Area of Science:
- Materials Science
- Environmental Engineering
- Polymer Chemistry
Background:
- Poly(vinyl alcohol) (PVA) membranes are explored for contaminant containment.
- Developing effective barriers against diverse chemical pollutants is crucial for environmental protection.
Purpose of the Study:
- To develop and evaluate a poly(vinyl alcohol) (PVA) membrane incorporating iron (Fe(0)) nanoparticles as a barrier for contaminant containment.
- To assess the performance of Fe(0)/PVA membranes against various model contaminants, including carbon tetrachloride, copper (Cu2+), nitrobenzene, 4-nitroacetophenone, and chromate (CrO4(2-)).
Main Methods:
- Fabrication of a poly(vinyl alcohol) (PVA) membrane embedded with zero-valent iron (Fe(0)) particles.
- Testing the membrane's efficacy by measuring breakthrough lag times for selected model contaminants.
- Quantifying the consumption of iron within the membrane due to reactions with contaminants.
Main Results:
- The Fe(0)/PVA membrane demonstrated over a 100-fold increase in breakthrough lag time for copper (Cu2+) and carbon tetrachloride compared to pure PVA.
- The enhancement in lag time varied depending on the contaminant, with smaller increases for nitrobenzene, 4-nitroacetophenone, and chromate (CrO4(2-)) due to reaction stoichiometry and membrane permeability.
- Significant percentages of iron were consumed by reactions with contaminants, with higher consumption observed for Cu2+ and carbon tetrachloride.
Conclusions:
- Polymer membranes with embedded Fe(0) particles show significant promise as practical barriers for contaminant containment.
- The effectiveness of Fe(0)/PVA membranes is influenced by contaminant type, reaction kinetics, and membrane properties.
- Further research into optimizing Fe(0) integration and membrane design could lead to advanced environmental remediation technologies.
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