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Effect of Frequency and Fixed Solid Catalyst for Radical Production in Sonocatalysis  

Cho, Eunju (School of Civil, Environmental and Architectural Engineering, Korea University)
Na, Seungmin (School of Civil, Environmental and Architectural Engineering, Korea University)
Lee, Seban (School of Civil, Environmental and Architectural Engineering, Korea University)
Khim, Jeehyeong (School of Civil, Environmental and Architectural Engineering, Korea University)
Publication Information
Journal of Korean Society on Water Environment / v.28, no.2, 2012 , pp. 219-223 More about this Journal
Abstract
The fixed solid catalysts such as glass bead, steel mesh, and $TiO_2$ coated ceramic bead were used to investigate effect of radical production at different frequencies. The radical production rate at 300 kHz was faster than that at 35 kHz without solid, but the tendency was changed with the presence of glass bead. The presence of glass beads create non-continuous points between the solid and liquid phases leading to increased formation of cavitation bubbles. However, the radical production decreased when steel mesh was used at 35 kHz although the surface area of contact with liquid was same when glass bead was used. Hence the solid catalyst did not always enhance the radical production. The radical production using $TiO_2$ coated ceramic bead was dramatically increased at 35 kHz due to the breakage of $TiO_2$ coated ceramic bead. Therefore the radical productions at 300 kHz using fixed solid catalysts generally increased while at 35 kHz the results fluctuated according to the experimental conditions.
Keywords
Coated $TiO_2$; Glass bead; Radical production; Sonocatalyst; Steel mesh;
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