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Cited by 508

The DOI matches its Crossref record; 17 of the 17 references it cites were found in a registry or an index.

Persulfate Persistence under Thermal Activation Conditions

Johnson, Richard L., Tratnyek, Paul G., Johnson, Reid O’Brien·2008·Environmental Science & Technology

Abstract

Contaminant destruction with in situ chemical oxidation (ISCO) using persulfate (peroxydisulfate, S2O8(2-)) can be enhanced by activation, which increases the rate of persulfate decomposition to sulfate radicals (SO4*-). This step initiates a chain of radical reactions involving species (including SO4*- and OH*) that oxidize contaminants more rapidly than persulfate does directly. Among current activation methods, thermal activation is the least well studied. Combining new data for environmentally relevant conditions with previously published data, we have computed three sets of Arrhenius parameters (In A and Eact) that describe the rate of persulfate decomposition in homogeneous solutions over a wide range of temperature and pH. The addition of soil increases the decomposition rate of persulfate due to reactions with organic matter and possibly mineral surfaces, but the kinetics are still pseudo-first-order in persulfate and conform to the Arrhenius model. A series of respike experiments with soil at 70 degrees C demonstrate that once the oxidant demand is met, reaction rates return to values near those observed in the homogeneous solution case. However, even after the oxidant demand is met, the relatively short lifetime of the persulfate at elevated temperatures (e.g., >50 degrees C) will limit the delivery time over which persulfate can be effective.

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Metadata

Authors
Johnson, R. L., Tratnyek, P. G., & Johnson, R. O.
Venue
Environmental Science & Technology
Published
2008-11-14
Volume
42
Issue
24
Pages
9350-9356
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W2040534411
Cited by
508
References
17
FWCI
7.16
Type
journal article
Language
en
Open access
closed

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