The degradation of organic dyes by corona discharge Page: 2 of 16
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Several dyes in water were individually exposed to corona
discharge. Light absorbance decreased for all organic dyes
with time. Absorbance losses with methylene blue, malachite
green, and new coccine were studied. The loss of color was
followed using an in situ colorimeter and the effects of
varying the current, voltage, gas phase, stirring rates,
salinity, and electrode spacing were investigated. The
highest reaction rates were observed using the highest
current, highest voltage (up to lOkV), highest stirring rate,
lowest salinity, smallest electrode spacing, and an
environment containing enhanced levels of oxygen. Current
was higher in the presence of nitrogen than in the presence
of oxygen (for the same voltage) , but the reaction of
methylene blue did not proceed unless oxygen was present.
These results help identify conditions using corona discharge
in which dyes, and potentially other organics, can be
Relatively little research has focused on the destructive
capabilities of corona discharge for organic or biochemicals.
Polychlorinated biphenyls (PCBs) and other halogenated
organics may be easily broken down into a mixture of harmless
chemicals using superoxide (0^) generated in solution .
The oxidizing environment caused by corona discharge is
believed to be potent, generating electrons, negative
molecular ions (including ions of nitrogen and oxygen)' ozone
and ultraviolet light , Corona discharge has been
reported to destroy aerosolized bacterial spores of Bacillus
thermophi1lius, reducing the spore concentration >99% .
These authors further proposed that corona discharge might
also fragment both harmful bacterial spores and toxic organic
Steve C. Goheen, Pacific Northwest Laboratories, P. 0. Box 999,
Richland, WA 99352
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Goheen, S.C.; McCulloch, M.; Durham, D.E. & Heath, W.O. The degradation of organic dyes by corona discharge, article, February 1, 1992; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc1092124/m1/2/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.