Water purification experiments to decompose phenol, acetic acid, and Rhodamine B in water
were conducted using a direct contact of gas corona discharge to the water surface. It was shown
that O2 was important in the gas phase for the degradation process, and the negative corona
showed higher degradation rates than the positive corona. It was found that the organic
contaminants can effectively be decomposed by the present method without pH adjustment.
The experimental results indicated that there were optimized values in the O2 concentration,
the gas resident time above the water, and the cathode−anode gap. It was also indicated that
the O2/CO2 mixture showed a higher degradation rate than the O2/N2 mixture for the gas phase.
As the degradation mechanism, the uncharged short-lived radicals are considered to be important.
We observed the diameters and the intervals of the wire-cathodes on the water purification using gas corona discharge, which can decompose organic contaminants that is stable against ozonation. We conclude that the larger diameters and the narrow intervals of the cathodes are suitable for the efficient supply of the short life radials into the water.
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