普通锐钛型TiO2催化超声降解十二烷基苯磺酸钠(SDBS)的研究

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. 

Investigation on Sonocatalytic Degradation of Sodium Dodecylbenzenesulfonate(SDBS) in the Presence of Ordinary Anatase TiO2

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.