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International Journal of Photoenergy
Volume 1, Issue 1, Pages 60-64
http://dx.doi.org/10.1155/S1110662X99000112

Ultrasonic enhancement of photo-catalytic oxidation of surfactant

1Department of Environmental Science, Graduate School of Science and Engineering, Japan
2Satellite Venture Business Laboratory, Japan
3Department of Materials Science and Chemical Engineering, Shizuoka University, Hamamatsu 432-8561, Japan

Copyright © 1999 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Photo-catalytic oxidation of surfactant (polyoxyethylene-alkyl-ether, C14H29O(CH2CH2)7H, hereinafter referred as SS-70) enhanced by high power ultrasound is examined. The influences of the ultrasonic power and the stirring speed on the degradation rate are investigated. 1000 ml of 100ppm SS-70 is decomposed totally in about 20 minutes in the photo-catalytic process combined with the ultrasonic irradiation. Without ultrasonic irradiation, the decomposition needs more than 1 hour. The optimum conditions for the hybrid degradation process are discussed. It is found that the stirring speed largely influenced the degradation efficiency. It is considered that the catalyst particles might be localized by ultrasonic standing wave, and caused inhibition to the decomposition in the degradation process. However, by high stirring speed, the inhibition could be overcome.