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Functionalized TiO2 nanoparticles for use for in situ anion immobilization
Shas V Mattigod1, Glen E Fryxell, Kentin Alford
1Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
Environmental Science & Technology
|October 6, 2005
Summary
Functionalized nanoparticles with copper-ethylenediamine complexes effectively bind pertechnetate. These nanoparticles are injectable and uniformly distribute in porous media for subsurface barrier applications.
Area of Science:
- Materials Science
- Environmental Science
- Nanotechnology
Background:
- Anatase nanoparticles were functionalized with ethylenediamine (EDA) ligands.
- A cationic copper-II (Cu(II)) complex was formed and bound to the nanoparticle surface.
Purpose of the Study:
- To investigate the binding affinity of the functionalized nanoparticles (FNPs) for pertechnetate anions.
- To evaluate the injectability and distribution of the FNPs for subsurface barrier applications.
Main Methods:
- Organosilane coating of anatase nanoparticles with EDA ligands.
- Treatment with Cu(II) solution to form Cu(EDA)2 complex on FNPs.
- X-ray photoelectron spectroscopy (XPS) for material characterization.
- Binding studies with pertechnetate in a groundwater matrix.
- Injectability tests in a porous medium.
Main Results:
- Successful functionalization of nanoparticles confirmed by XPS.
- Cu(EDA)2 FNPs demonstrated binding affinity for pertechnetate.
- FNPs were readily injectable and showed uniform distribution in the test column.
Conclusions:
- The developed Cu(EDA)2 FNPs show promise for pertechnetate removal.
- Uniform distribution suggests suitability for in-situ subsurface reactive barrier applications.