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

作　　者：张朝红[1] 吕艳辉[2] 王君[2,3] 邓英俏[1] 姜喆[2] 郜炜[1] 王杰[1] 

机构地区：[1]辽宁大学环境学院,沈阳110036 [2]辽宁大学化学院,沈阳110036 [3]辽宁大学药学院,沈阳110036

出　　处：《环境科学学报》2009年第5期955-959,共5页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.20371023);辽宁省教育厅自然科学基金(No.05L154)~~

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.Investigations into the degradation of dyes such as acid red B were carried out using air bubbling combined with glass balls （ bubbling cavitation）. In addition, the effects of bubbling time, ioitial concentration, glass ball diameter, solution acidity and gas flow rate on the degradation of acid red B were studied. The results showed that the degradation ratio of acid red B reached 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.

关 键 词：鼓泡空化 有机污染物 降解方法 

分 类 号：X703[环境科学与工程—环境工程]