【摘要】 研究了不同条件下TiO₂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%。更多还原

【Abstract】 A variety of affecting factors on ultrasonic degradation ofRhodamine B （an organic dye） and its degradation mechanism were studied in the presence of a 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.更多还原