纳米氧化锌(ZnO)催化超声波降解酸性红B的研究

Degradation of Acid Red B in the Presence of Nanon-Sized ZnO Powder under Ultrasonic Irradiation

采用高温活化处理过的纳米氧化锌(ZnO)粉末为催化剂,研究了超声照射对酸性红B的降解.另外,还考查了超声照射时间,酸性红B初始浓度和纳米ZnO的添加量对酸性红B降解反应的影响.结果表明:在纳米ZnO作用下,酸性红B的超声降解效果明显优于单纯超声波照射降解.降解动力学符合一级反应.在超声波频率40 kHz,输出功率50 W,催化剂用量1.0 g/L,pH为7.0,温度25℃,酸性红B水溶液初始浓度10 mg/L的条件下,照射120 min左右时降解率即可达到86%以上.

Some factors such as ultrasonic irradiation time, initial concentration of acid red B and addition amount of ZnO on ultrasonic degradation of Acid Red B was studied with nanometer ZnO catalyst activated at high-temperature. The results indicated that the effects of sonocatalytic degradation were more obvious in the presence of nanometer ZnO. The ultrasonic degradation kinetics of Acid Red B in the presence of nanometer ZnO catalyst follows first-order reaction. The degradation ratio of Acid Red B surpassed 86% within 120 min under conditions of ultrasonic frequency of 40 kHz, power input of 50W, amount of catalyst of 1.0 g/L, pH = 7, temperature of 25℃ and Acid Red B concentration of 10 mg/L.