Skip Navigation
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Internet Explorer is no longer a supported browser.

This website may not display properly with Internet Explorer. For the best experience, please use a more recent browser such as the latest versions of Google Chrome, Microsoft Edge, and/or Mozilla Firefox. Thank you.

Your Environment. Your Health.

Boston University

Superfund Research Program

Iron-Dependent Oxidative Remediation of Chlorethylenes

Project Leader: Pericles Stavropoulos (Missouri University of Science and Technology)
Grant Number: P42ES007381
Funding Period: 2000-2012

Learn More About the Grantee

Visit the grantee's eNewsletter page Visit the grantee's eNewsletter page Visit the grantee's Twitter page View the grantee's Factsheet(377KB)

Project Summary (2000-2005)

Chlorinated ethylenes constitute a class of common environmental contaminants of groundwater at superfund sites that have been targeted for application of cleanup technologies. Among different treatment methodologies, in situ abiotic remediation that relies upon redox processes holds promise as an effective and economical alternative to "pump-and-treat" strategies or microbial-dependent remediation. In principle, chlorinated ethylenes can be efficiently dechlorinated to innocuous carbonaceous products and inorganic chloride, if reductive and oxidative dechlorination chemistry is applied in sequence. In situ reductive treatment of chloroorganics has been considerably advanced with the introduction of permeable reactive treatment walls filled by particulate zero-valent iron. The reductive treatment is best suited for the highly chlorinated members of the chloroethylene class and currently requires support by oxidative treatment (air sparging) to degrade less chlorinated chloroorganics and non-chlorinated petroleum hydrocarbons. The present proposal investigates a novel oxidative approach that relies upon catalytic oxygenation/dechlorination of chloroethylenes, mediated by specific iron reagents, in the presence of sacrificial amounts of dioxygen and a reducing agent (usually metallic Fe or Zn) or hydrogen peroxide alone. The specific targets of this work are to: (i) develop iron-based oxidizing systems to perform oxidative dechlorination of chloroethylenes in aqueous media, by examining the fundamental chemistry of relevant iron complexes and intermediates in the course of activating dioxygen or hydrogen peroxide to unravel an active oxidant that attacks chloroethylenes; (ii) provide mechanistic understanding of the dechlorination process, by examining the nature of the active oxidant involved, via spectroscopic investigation of intermediates and kinetic analysis, and by exploring the manner by which this oxidant adds to chloroethylenes (concerted, step-wise (radical, carbocationic)); and (iii) explore heterogenized versions of the iron reagents to be tested in column dechlorination studies in conjunction with zero-valent iron.

Back
to Top