Ultrasonic Degradation Of MO Was Studied With TiO₂ As Catalyst

China is one of the countries where the most of dye all over the world is produced. It was reported that the output of the dye of our country had been 412,000 ton in the year of 2002, increasing at 31.1 percent as the same time of the last year, and that the output had been about 46 percent of the whole and occupied the first place. With the creasing of the sort and the quantity of dye, dye wastewater has been one of the main waste water. Dye wastewater can not be treated effectively with tradition method for its deep color, poor biochemical decomposition and complicated components. On the other hand, dye wastewater involves lots of organic matters, which is virulent or may lead to cancer, abnormality and mutation. Therefore, worldwide attention has been paid on exploring non-conventional technique to degrade dye wastewater.Ultrasonic technology has played a great role, and will find a promising future in the area of wastewater treatment as one of the advanced oxidation methods owing to increasing degradation of nondegradable organic pollutants and enhancing biology activity wastewater treatment. As a new technology of organic pollutant degradation, the photocalalytic method, which effectively decomposes nondegradable pollutants, is becoming increasingly important in wastewater treatment. However, this means can't be used unless there is UV lamp. this paper introduces the new method, in which UV light is be replaced by ultrasound. For convenient, methyl orange (MO) solution was taken as representative of dye wastewater. Ultrasonic degradation of MO was studied with TiO₂ as catalyst. The mechanism of degradation is investigated, and recent advances in the dye wastewater treatment using this integrated method reviewed. Finally, key question need to solute and development orientation for the future in application of TiO₂ degradation catalyzed by ultrasound technology in wastewater treatment, was point out in this paper.The paper studied plenty of factors affecting the ultrasonic degradation of MO with TiO₂ as catalyst, for example, the time of ultrasonic radiation, the quantity of TiO₂, the ultrasound frequency and power, the beginning PH of solution and so on. The main content as follows:1. Designed processing bath, the XRD pattern showed TiO₂ structure, properties and dispersion behavior of the catalyst.2. Studied the degradation effects only when time changed and found that with the prolonging of the time, the degradation rate of MO were keeping rising.3. Analyzed the kinetics of the reaction, proved it to be the first, and calculated the rate.4. Through the experiment, found that with the increasing of the catalyst quantity the degradation rate were holding rising, however, when the number input increased 0.75mg/L, the degradation rate almost did not rise.5. Investigated the experiment, found that with the changing of the frequency, the effect changed a little and the result with the 25 KHz preceded the others slightly.6. With the increasing of the ultrasound power, the degradation rate raised obviously, but the power can not be improved too much, and the 55w was the best in the study.7. Found that the degradation of MO was the better in the acidic condition and the result was the best when the PH was 1.0.8. Studied separately the degradation of MO radiated by single transducer or double and the effect of the latter was better evidently.9. Measure.the distribution of the sound field and the cavitations field and analyze the result.