Preparation of high active nanometer TiO 2 sonocatalyst by partial transition crystal in hydrogen peroxide solution under ultrasonic irradiation

Abstract

The transition crystal nanometer TiO 2 sonocatalyst with high sonocatalytic activity was prepared utilizing the method of ultrasonic irradiation in hydrogen peroxide solution. The sonocatalytic activity of transition crystal nanometer TiO 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 TiO 2 powder is obviously higher than ones of both original nanometer rutile and anatase TiO 2 powders. The degradation ratios of acid red B and azo fuchsin in the presence of the transition crystal nanometer TiO 2 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 TiO 2 powders, 73.5% and 59.5% in the presence of original nanometer rutile TiO 2 powders, respectively, while the corresponding degradation ratios are only 29.8% and 14.2% in the absence of any TiO 2 catalyst, respectively. The degradation processes of both acid red B and azo fuchsin solutions are the pseudo-first-order reaction.