Preparation of high active nanometer TiO2 sonocatalyst by partial transition crystal in hydrogen peroxide solution under ultrasonic irradiation

The transition crystal nanometer TiO2 sonocatalyst with high sonocatalytic activity was prepared utilizing the method of ultrasonic irradiation in hydrogen peroxide solution. The sonocatalytic activity of transition crystal nanometer TiQ(2) powder was validated through the degradation of acid red B and azo fuchsin solutions by ultrasonic irradiation, respectively. The results show that the sonocatalytic activity of the transition crystal nanometer TiO2 powder is obviously higher than ones of both original nanometer rutile and anatase TiO2 powders. The degradation ratios of acid red B and azo fuchsin in the presence of the transition crystal nanometer TiO2 catalyst surpass 96.5% and 85.3% within 40 min ultrasonic irradiation, respectively. At the same conditions, the degradation ratios are 62.5% and 45.0% in the presence of original nanometer anatase TiO2 powders, 73.5% and 59.5% in the presence of original nanometer rutile TiO2 powders, respectively, while the corresponding degradation ratios are only 29.8% and 14.2% in the absence of any TiO2 catalyst, respectively. The degradation processes of both acid red B and azo fuchsin solutions are the p scud o -first-order reaction. (c) 2006 Elsevier B.V. All rights reserved.