纳米锐钛型TiO_2催化超声降解SDBS溶液

ULTRASONIC AND CATALYTIC DEGRADATION OF SODIUM DODECYLBENZENESULFONATE (SDBS) SOLUTION IN THE PRESENCE OF NANOMETER ANATASE TiO_2

十二烷基苯磺酸钠(SDBS)是一种具有代表性的表面活性剂,由于大量的使用而成为环境污染的主要污染源之一。本文采用纳米锐钛型TiO2作催化剂,使用低功率超声降解水中的SDBS。同时也考察了SDBS溶液的初始浓度、TiO2催化剂的加入量、溶液初始pH值、反应温度、超声波的频率和功率以及TiO2催化剂的使用次数等因素对降解率的影响。在SDBS水溶液初始浓度50.00mg/L,纳米锐钛型TiO2催化剂用量为750mg/L,超声波频率40kHz,输出功率50W,温度40℃,pH为3.00的条件下,通过导数分光光度法测定,120min内几乎全部降解。反应动力学研究显示,SDBS超声降解为一级反应。可见纳米锐钛型TiO2催化超声降解有机污染物的方法具有很好的应用前景。

Sodium dodecylbenzenesulfonate （SDBS） as a kind of representative surfactant has widely been used and become one of main sources in environmental pollutants. In this paper, it was found that SDBS in the water could be degraded completely under the function of low power ultrasound in the presence of nanometer anatase TiO2. In the experiment, the effect of all kinds of factors such as initial concentration of SDBS, adding amount of TiO2, initial pH of solution, temperature, frequency and power of ultrasound and reused times of catalyst on degradation ratios were reviewed, When the experimental conditions of 50.00 mg/L SDBS, 750 mg/L TiO2, pH = 3.00, 40℃, 40 kHz and 50 W were adopted, the degradation ratio of 100% could almost be obtained within 120 min. Moreover, the kinetic research showed that the ultrasonic and catalytic degradation of SDBS is a first order reaction. Thereby the ultrasonic and catalytic degradation of organic pollutants catalyzed by nanometer anatase TiO2 catalyst has better useful prospect.