高频超声降解偶氮染料活性红MX-5B废水的研究  

Research in High Frequency Ultrasonic for Degradation of Azo Dye Wastewater Containing MX-5B

作　　者：谢炜平[1] 秦艳[2] 邹原[1] 何德文[2] 宋丹[2] 

机构地区：[1]深圳职业技术学院深圳市工业节水与城市污水资源化技术重点实验室,深圳518055 [2]中南大学冶金科学与工程学院,长沙410083

出　　处：《环境科学》2010年第9期2092-2099,共8页Environmental Science

基　　金：深圳市科技计划项目(06KJD047)

摘　　要：采用高频超声降解偶氮染料活性红MX-5B模拟废水,考察了溶液初始pH值、超声参数、曝气、Fe2+浓度以及多频效应对活性红MX-5B超声降解过程的影响,并初步探讨了活性红MX-5B的超声降解规律.结果表明,酸性条件下,高频超声能有效降解MX-5B,当pH=3.5,f=418.3kHz,P=69W时,反应180 min后,MX-5B模拟废水脱色完全.微量Fe2+与超声空化产生的H2 O2形成类Fenton体系,可强化MX-5B的脱色反应.曝气有利于MX-5B脱色,但影响不大.多频超声对MX-5B的脱色效果优于单频超声处理效果.超声降解MX-5B以自由基氧化机制为主,并遵循表观一级反应动力学.染料分子中的NN形成的共轭发色体系已完全破坏,芳香结构也大部分遭到了羟基自由基的破坏.The degradation of azo dye wastewater,containing MX-5B,was investigated by using high frequency ultrasonic irradiation.The effect of different factors like the initial pH of solution,sonolysis parameters,air-blowing,Fe2 ＋ concentration were studied,the synergistic action of complex frequency and the mechanism of degradation was explored primarily.The results show that MX-5B in aqueous solution can be degraded efficiently by ultrasonic irradiation,when the pH 3.5,ultrasonic frequency 418.3kHz,ultrasonic power 69 W,color removal rate up to 100% in 180 min.Adding of Fe2 ＋ and blowing air had some effects.The results also indicated that radical-oxidation controlled the ultrasonic decompose of MX-5B and MX-5B ultrasonic removal was observed to behave as pseudo-first-order kinetics under different experimental conditions tested in the present work.Comparison of UV-Vis absorption spectrums before and after treatment showed that all of the conjugate structure and part of aromatic structure were destroyed after being ultrasonic irradiation.

关 键 词：高频 超声 偶氮染料 降解 废水 

分 类 号：X791[环境科学与工程—环境工程]