Manage your Funding Opportunities
  

Paul Tratnyek Institute of Environmental Health

Empty picture place holder

Paul Tratnyek

Research Interest Keywords

contaminants, degradation, kinetics, mechanisms, redox, reduction, oxidation, dechlorination, water, treatment, purification, disinfection

Email

Manage your Funding

Link

http://www.ebs.ogi.edu/tratnyek/

Scopus Publication Detail

The publication detail shows the title, authors (with indicators showing other profiled authors), information on the publishing organization, abstract and a link to the article in Scopus. This abstract is what is used to create the fingerprint of the publication.


Reductive sequestration of pertechnetate (99TcO4-) by nano zerovalent iron (nZVI) transformed by abiotic sulfide

Dimin Fan; Roberto P. Anitori; Bradley M. Tebo; Paul G. Tratnyek; Juan S. Lezama Pacheco; Ravi K. Kukkadapu; Mark H. Engelhard; Mark E. Bowden; Libor Kovarik; Bruce W. Arey

(Profiled Authors: Bradley Tebo; Paul Tratnyek)

Environmental Science and Technology. 2013;47(10):5302-5310.

Abstract

Under anoxic conditions, soluble pertechnetate (99TcO 4-) can be reduced to less soluble TcO2· nH2O, but the oxide is highly susceptible to reoxidation. Here we investigate an alternative strategy for remediation of Tc-contaminated groundwater whereby sequestration as Tc sulfide is favored by sulfidic conditions stimulated by nano zerovalent iron (nZVI). nZVI was pre-exposed to increasing concentrations of sulfide in simulated Hanford groundwater for 24 h to mimic the onset of aquifer biotic sulfate reduction. Solid-phase characterizations of the sulfidated nZVI confirmed the formation of nanocrystalline FeS phases, but higher S/Fe ratios (>0.112) did not result in the formation of significantly more FeS. The kinetics of Tc sequestration by these materials showed faster Tc removal rates with increasing S/Fe between 0 and 0.056, but decreasing Tc removal rates with S/Fe > 0.224. The more favorable Tc removal kinetics at low S/Fe could be due to a higher affinity of TcO4- for FeS than iron oxides, and electron microscopy confirmed that the majority of the Tc was associated with FeS phases. The inhibition of Tc removal at high S/Fe appears to have been caused by excess HS-. X-ray absorption spectroscopy revealed that as S/Fe increased, the pathway for Tc(IV) formation shifted from TcO2·nH 2O to Tc sulfide phases. The most substantial change of Tc speciation occurred at low S/Fe, coinciding with the rapid increase in Tc removal rate. This agreement further confirms the importance of FeS in Tc sequestration. © 2013 American Chemical Society.


PMID: 23611018    

Scientific Context

This section shows information related to the publication - computed using the fingerprint of the publication - including related publications, related experts with fingerprints representing significant amounts of overlap between their fingerprint and this publication. The red dots indicate whether those experts or terms appear within the publication, thereby showing potential and actual connections.

Related Publications

Related Topics

Appears in this Publication Appears in this Document

Related Experts

Author of this Publication Author of this Document