超声波处理难降解有机物影响参数研究  

Study of sonication parameters for refractory organic chemicals

作　　者：张光明[1] 周吉全[1] 张锡辉[1] 吴敏生[1] 

机构地区：[1]清华大学深圳研究生院,深圳518055

出　　处：《环境污染治理技术与设备》2005年第5期42-45,共4页Techniques and Equipment for Environmental Pollution Control

基　　金：深圳市科技局科技三项经费资助项目(2002 k3 134)

摘　　要：考察了多种操作参数对多氯联苯、溴苯超声波降解的影响。结果表明,高频率、高声强、高流速、混合气体可以提高超声反应速率, 358kHz下降解速率比20kHz提高了848%, 34mL/min流速下比4 4mL/min提高了140%,参入Ar比单纯使用O2 提高83% ( +80%Ar)或66% ( +50%Ar)。然而高声强也造成了较多的能量消耗。自由基清除剂的存在则较大地降低了超声反应速率, 200mmol/LCO2- 存在时反应速率下降了79%。The impacts of multiple operative parameters on the sono-degradation of polychlorinated biphenyls and bromobenzene were investigated. The results showed that sonochemical reactions benefited from high frequencies, high sound intensities, fast flows, and mixed gases. The reaction rate at 358 kHz was 848% higher than that at 20 kHz, and 34 mL/min flow rate increased reaction rate by 140% compared to 4.4 mL/min. Mixing Ar into pure oxygen increased the reaction rate by 83% (+80%Ar) or 66%(+50%Ar). However, higher intensity also consumed more energy. The existence of free radical scavenger decelerated sono-reactions, and the reaction rate was reduced by 79% by 200 mmol/L CO 2- 3.

关 键 词：难降解有机物 超声波处理 参数研究 反应速率 自由基清除剂 超声波降解 多氯联苯 操作参数 混合气体 降解速率 能量消耗 高声强 min 高频率 流速 

分 类 号：X703.1[环境科学与工程—环境工程] TF111.18[冶金工程—冶金物理化学]