| 高频超声降解偶氮染料活性红MX-5B废水的研究 |
| 摘要点击 2075 全文点击 1143 投稿时间：2009-12-11 修订日期：2010-03-29 |
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| 中文关键词 高频 超声 偶氮染料 降解 废水 |
| 英文关键词 high frequency ultrasonic azo dye degradation wastewater |
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| 中文摘要 |
| 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H2O2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NN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. |
| 英文摘要 |
| 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. |
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