title: Functionalized TiO2 nanoparticles for use for in situ anion immobilization.
abstract: Anatase particles (40-60 nm) were coated with an organosilane monolayer terminated with an ethylenediamine (EDA) ligand. These functionalized nanoparticles (FNPs) were then treated with an aqueous solution of Cu(II) to create a cationic Cu-EDA complex bound to the nanoparticle surface. Cu(II) and EDA ligand incorporation were confirmed by X-ray photoelectron spectroscopy (XPS) analysis. The Cu(EDA)2 FNP was then studied for its binding affinity for pertechnetate anion from a Hanford groundwater matrix. The Cu(EDA)2 FNP was also evaluated for its injectability into a porous medium for possible application as a subsurface semipermeable reactive barrier. Injection was readily accomplished, and resulted in a highly uniform distribution of the FNP sorbent in the test column.
authors.affiliation: Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
authors.forename: Shas V
authors.initials: SV
authors.lastname: Mattigod
authors.forename: Glen E
authors.initials: GE
authors.lastname: Fryxell
authors.forename: Kentin
authors.initials: K
authors.lastname: Alford
authors.forename: Tyler
authors.initials: T
authors.lastname: Gilmore
authors.forename: Kent
authors.initials: K
authors.lastname: Parker
authors.forename: Jeff
authors.initials: J
authors.lastname: Serne
authors.forename: Mark
authors.initials: M
authors.lastname: Engelhard
mesh_terms: D000327:Adsorption; D000838:Anions; D002412:Cations; D003300:Copper / Q000032:analysis*; D004563:Electrochemistry; D005029:Ethylenediamines / Q000032:analysis*; D007477:Ions; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical; D049329:Nanostructures / Q000032:analysis; D036103:Nanotechnology; D010539:Permeability; D011208:Powders; D013670:Sodium Pertechnetate Tc 99m / Q000032:analysis; D013052:Spectrometry, X-Ray Emission / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013667:Technetium / Q000737:chemistry; D014025:Titanium / Q000032:analysis*; D014873:Water Pollutants; D018508:Water Purification / Q000379:methods*
chemical_list: D000838:Anions; D002412:Cations; D005029:Ethylenediamines; D007477:Ions; D011208:Powders; D014873:Water Pollutants; C009495:titanium dioxide; C031234:ethylenediamine; D013667:Technetium; D003300:Copper; D013670:Sodium Pertechnetate Tc 99m; D014025:Titanium