Bimetallic Zero Valent Iron Composites for In Situ Remediation

The EPA estimates that one out of every four Americans lives within three miles of a hazardous waste site. Recent advanced materials developments have driven increased use of In Situ Chemical Reduction (ISCR) remediation in the US and globally. Nanoscale Zero Valent Iron (NZVI) holds great potential for ISCR due to its low cost and high capacity for degrading halogenated compounds. However, two major technical challenges prevent wide-spread NZVI adoption: 1) agglomeration, which prevents transport in the subsurface; and 2) passivation, which decreases reactivity to contaminants. During a NIST Phase I program, AxNano, in collaboration with University of Arkansas, proved the feasibility of a novel, three-component composite composed of bimetallic NZVI on a carbon-based substrate (RemRxTM CSI) for in situ remediation of trichloroethylene. RemRxTM CSI achieved 10x greater transport than NZVI particles alone, and 4x greater transport than NZVI particles on activated carbon. Removal of TCE by the RemRxTM CSI was 30% greater than by the NZVI particles alone. Having proven feasibility in a laboratory setting, Phase II will focus on prototyping, scale-up manufacturing and pilot scale field testing of RemRxTM CSI. This SBIR program will produce a novel, low-cost remediation with broad-spectrum efficacy to meet market and society needs.