The degradation of organic dyes by corona discharge Page: 4 of 16
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spectrum of organics. The present report demonstrates the
ability of corona discharge to bleach various organic dyes.
These reactions may become useful as indicators of corona-
A high voltage power supply (Kilovolt Corporation,
Hackensack, NJ) was used with an output of up to ca. 15kV. A
dual-pen strip chart recorder (Soltec, San Fernando, CA) , a
PC600 colorimeter (Brinkman Instruments, Cleveland, OH) for
constant on-line monitoring, and a picoammeter (Keithley
Instruments, Cleveland, OH) were also used to record the
current between the two electrodes. Initial
spectrophotometric results were obtained using a Varian DMS—
200 UV-Vis spectrophotometer (Varian Instruments, Sunnyvale,
California). The reaction chamber consisted of a one liter
wide mouth flask with 6 access ports (Figure 1). The ports
were fitted with ground glass stoppers. Each port had
access-tube options such that electrodes or gasses could be
introduced near the bottom, middle, or top of the reaction
chamber (Figure 1). A stainless steel anode with a sharpened
point was placed above the water level, inserted through one
of the six ports of the reaction vessel. The platinum
cathode (ground) was insulated through the gas phase of the
chamber by a glass tube, but exposed at the bottom of the
vessel. It was inserted into the vessel through another port
at the top. The electrodes were insulated using glass tubes
which were connected by ground glass joints to help seal the
vessel from external air. The cathode was inserted through a
glass tube which protruded into the liquid phase all the way
to within about 1/4" of the bottom of the flask. The anode
was connected to the power supply and served as the ion
source. Efforts have been made to minimize the number of
construction materials present in the reaction chamber. The
main substance with which material came into contact was
glass, which appeared to have been resistant to degradation.
Teflon stirrer bars were used. The stainless steel
electrodes appeared to corrode in the reaction vessel, while
the platinum (grounded) electrode did not.
Reagents used were methylene blue (Kodak, Rochester, NY),
Malachite Green (Sigma Chemical, St. Louis, MO), New Coccine
(Aldrich Chemical, Milwaukee, WI), and silicic acid
(Mallinckrodt, Paris, KY). Water was purified using a Milli
Q water purification system (Millipore Corp., Bedford, MA).
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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/m1/4/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.