纳米锐钛型TiO_2催化超声降解罗丹明B的研究

A Study on Ultrasonic Degradation of Rhodamine B in the Presence of a Nano Anatase TiO_2 Catalyst

研究了不同条件下TiO_2催化超声降解有机染料罗丹明B条件和相关机理。该反应为一级动力学反应,其常数为:0.0171min～1;初始浓度从0增加到10mg/L时降解率增加,超过10mg/L时降解率开始下降;当催化剂浓度为1000mg/L降解率达到最大。研究结果表明:在pH=5、初始浓度为10mg/L、催化剂浓度为1000mg/L、超声功率50W、超声频率40kHz,体系温度为20℃时,经100分钟,罗丹明B的降解率达到83.7%。

A variety of affecting factors on ultrasonic degradation of Rhodamine B （an organic dye） and its degradation mechanism were studied in the presence ofa nano anatase TiO2 catalyst. The degradation kinetics was found to be of the first order, the kinetic constant was 0.0171min^-1; the degradation rate improved with the increase of initial dye concentration from 0 to 10 mg/L, and decreased if the initial dye concentration was 〉10 mg/L; the maximum degradation rate achieved when the concentration of the catalyst was 1000mg/L. The results indicated that the effects of ultrasonic degradation were apparent in the presence of a nano anatase TiO2 than in the absence of any form of TiO2. The degradation ratio of Rhodamine B would be surpassed to 83.7% within 100 min under the experimental conditions, as ultrasonic frequency of 40kHz, output power of 50W, TiO2 catalyst 1000mg/L, pH = 5.00 at 20 and initial Rhodamine B concentration of 10.0mg/L.