污染控制技术及原理
张朝红,吕艳辉,王君,邓英俏,姜喆,郜炜,王杰.一种新型降解有机污染物的方法:鼓泡空化法[J].环境科学学报,2009,29(5):955-959
一种新型降解有机污染物的方法:鼓泡空化法
- A novel degradation method for organic pollutants:bubbling cavitation
- 基金项目：国家自然科学基金(No.20371023);辽宁省教育厅自然科学基金(No.05L154)
- 作者
- 单位
- 张朝红
- 辽宁大学环境学院, 沈阳 110036
- 吕艳辉
- 辽宁大学化学院, 沈阳 110036
- 王君
- 1. 辽宁大学化学院, 沈阳 110036; 2. 辽宁大学药学院, 沈阳 110036
- 邓英俏
- 辽宁大学环境学院, 沈阳 110036
- 姜喆
- 辽宁大学化学院, 沈阳 110036
- 郜炜
- 辽宁大学环境学院, 沈阳 110036
- 王杰
- 辽宁大学环境学院, 沈阳 110036
- 摘要：采用空气鼓泡结合玻璃珠(鼓泡空化)的方法,对酸性红B等染料的降解进行了研究,考察了各种因素(鼓泡时间,初始浓度,玻璃珠直径,溶液酸度和气体流速等)对酸性红B降解的影响.结果表明,在室温(25℃)条件下,当鼓泡时间为5.0h、溶液初始浓度为10mg·mL-1、玻璃珠直径为3.0～3.5mm、溶液酸度pH=6.0和气体流速4.5L·min-1时,酸性红B的降解率可达97%以上.同时,还初步探讨了鼓泡空化的形成过程和降解有机污染物的机理,推测是气泡融合时气泡之间的内壁张力达到极限致使气泡破裂,放出大量能量,使水(H2O)和氧气(O2)反应生成氧化性极强的氢氧自由基(.OH)和超氧自由基(·O2-),使溶液中的有机污染物降解.
- Abstract：Investigations into the degradation of dyes such as acid red Bwere carried out using air bubbling combined with glass balls(bubbling cavitation).In addition,the effects of bubbling time,initial concentration,glass ball diameter,solution acidity and gas flow rate on the degradation of acid red Bwere studied.The results showed that the degradation ratio of acid red Breached over 97% for a 5.0 h bubbling time,10 mg·L-1 initial concentration,3.0～3.5 mm glass balls,pH = 6.0 and 4.5 L·min-1 gas flow rate at room temperature(25℃).Meanwhile,the mechanism of bubbling cavitation and the degradation mechanism of organic pollutants are discussed.We propose that when two small bubbles collapse into a large one,the inner wall tension between the bubbles reaches a maximum so that the bubbles break.The large amount of energy released in the process induces H2O and O2 to form ·OH and ·O2- radicals which are strongly oxidizing.Thus,the organic pollutants in the solution are degraded.
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