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.

Nanotechnology-based electrochemical sensors for biomonitoring chemical exposures

“…Future opportunities exist to investigate the use of alternative affinity or sequestration stationary phases, such as titanium oxide, zirconium oxide, aptamers (small nucleic acids strands), chelators, self-assembled monolayers, polymer-modified nanoparticles, and nanostructured hydrogels (Singh et al, 1999; Flounders et al, 1999; Liu and Lin, 2005; Mattigod et. al., 2005; Nayak and Lyon, 2005; Castellana et al, 2006; Yantasee, et.…”

Assessing the Risks of Manufactured Nanomaterials

“…Metal and metal-oxide nanoparticles (e.g., nanoiron, magnetite, TiO 2 ) have been proposed for groundwater remediation (11,39,40), water treatment (41,42), and removal of toxic contaminants from air streams (43). Their widespread use could expose biological systems through inhalation, dermal contact, or ingestion and absorption through the digestive tract.…”

Self-assembled monolayers and titanium dioxide: From surface patterning to potential applications

“…There are several indications (most of them based on the FTIR signal of the C–H stretch envelope) that the amount of chemisorbed trichlorosilane molecules is higher in TiO 2 than in SiO 2 , possibly due to the presence of surplus water [17] or, in the case of TiO 2 films consisting of sintered nanocrystalline TiO 2 , due to a difference between the geometrical area and the true area [18]. Conversely, the density of a protein, immobilized on a substrate through an alkylsilane SAM having a terminal amine, was observed to be lower on a TiO 2 substrate than on a SiO 2 substrate [19].…”