Transport, Targeting and Applications of Metallic Functional Nanoparticles for Degradation of DNAPL Chlorinated Organic Solvents
Recently, laboratory and field studies have demonstrated that zero-valent iron nanoparticles (colloids) can rapidly transform dissolved chlorinated organic solvents into non-toxic compounds. This technology also has the potential to address Dense Non- Aqueous Phase Liquid (DNAPL) contamination, one of DOE's primary contamination problems. This project develops and tests polymer-modified reactive nanoscale Fe0 particles for in situ delivery to chlorinated solvents that are present as DNAPLs in the subsurface. The surfaces of reactive Fe0-based nanoparticles are modified with amphiphilic block copolymers to maintain a stable suspension of the particles in water for transport in a porous matrix and to create an affinity for the water-DNAPL interface. Ultimately this will provide an improved technology to locate and eliminate DNAPL, a recalcitrant and persistent source for groundwater contamination by chlorinated solvents. Candidate polymers have been synthesized and attached to 20 nm SiO2 particles using Atom Transfer Radical Polymerization (ATRP). The physical properties (hydrodynamic radius, stability, TCE-water partitioning behavior, mobility in a porous matrix) of these nanostructures have been determined. The particles (dp {approx}102 nm) are water soluble and partition to the TCE-water interface. The physical and chemical properties (e.g. oxide phase and thickness) of Fe0 nanoparticles synthesized using different techniques and the effects of these properties on particle reactivity and efficiency have been evaluated. Numerical models (Brownian Dynamics) have been developed to predict the aqueous diffusivities of these particle-polymer nanostructures.
- Research Organization:
- Carnegie Mellon University, Pittsburgh, PA; Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC) (US)
- DOE Contract Number:
- FG07-02ER63507
- OSTI ID:
- 826028
- Resource Relation:
- Conference: 227th American Chemical Society Meeting, Anaheim, CA (US), 03/28/2004--04/01/2004; Other Information: PBD: 31 Mar 2004
- Country of Publication:
- United States
- Language:
- English
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Transport, Targeting, and Applications of Metallic Functional Nanoparticles for Degradation of DNAPL Chlorinated Organic solvents