普通锐钛型TiO_2催化超声降解十二烷基苯磺酸钠(SDBS)的研究

Investigation on Sonocatalytic Degradation of Sodium Dodecylbenzenesulfonate(SDBS) in the Presence of Ordinary Anatase TiO_2

十二烷基苯磺酸钠(SDBS)是一种具有代表性的阴离子表面活性剂,由于大量的使用而成为环境污染的主要污染源之一.采用锐钛型TiO2作催化剂,使用低功率超声波降解水中的SDBS.同时也考察了SDBS溶液的初始质量浓度,TiO2催化剂的加入量,溶液初始pH,反应温度,超声波的频率和功率等因素对降解率的影响.在SDBS水溶液初始质量浓度为50.00 mg/L,锐钛型TiO2催化剂用量为1 000 mg/L,超声频率40 kHz,超声功率50 W,温度40℃,pH为3.00的条件下,通过导数分光光度法测定发现SDBS在300 min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.

Sodium dodecylbenzenesulfonate （SDBS） as a kind of representative surfactant has widely been used and become one main source of environmental pollution. Anatase TiO2 was adopted as catalyst and low-power ultrasound used to degrade SDBS in the water. In the experiment, all kinds of factors on degradation ratios such as initial mass concentration of SDBS, adding amount of TiO2, initial pH of solution, temperature, frequency and power of ultrasound and reused times of catalyst were reviewed. When the experimental conditions of initial SDBS 50.00 mg/L, TiO2 addition 1 000 mg/L, pH 3.00, 40℃, ultrasound frequency 40 kHz and ultrasound output power 50 W were adopted, SDBS could almost be completely degraded within 300 min, according to derivative spectrophotometry. Moreover, the kinetic research shows that the sonocatalytic degradation of SDBS is a first-order reaction.