【摘要】 采用功率超声的新方法降解水体有机污染物十二烷基苯磺酸钠 (SDBS) ,实验研究了超声反应时间、超声波频率、功率、声强、溶液初始pH值、变幅杆直径和空化气体等因素的影响 .结果表明 :SDBS降解率与超声反应时间呈线性关系 ,具有一级反应动力学特征 ;低频范围内改变超声波频率 ,对SDBS降解率的影响不大 ;增大超声波功率、声强和辐照面积 ,可以明显提高SDBS降解率 ,最高为 4 2 5 % ;溶液初始pH值对SDBS降解率的影响较为显著 ;充入空化气体 ,SDBS降解率明显提高 ,其影响排序为Ar >O2 >N2 .更多还原

【Abstract】 A new method of ultrasonic irritation was applied to decompose sodium dodecyl benzene sulphonate (SDBS) in aqueous solution. Effects of sonication time, ultrasonic frequency, ultrasonic power, ultrasonic intensity, probe diameter, initial pH value and cavitating gas on SDBS degradation efficiency were experimentally studied. The results show that SDBS degradation efficiencies increase linearly with sonication time in the first-order kinetics. Influence of ultrasonic frequency on SDBS degradation in low frequency ranges is insignificant. With increase of ultrasonic power, intensity and probe diameters, SDBS degradation efficiency increases to a maximum value of 42.5%. Effect of initial pH value on SDBS degradation is significant and acidic condition is more favorable for the reaction. The attendance of selected cavitating gases is good for SDBS degradation; their contribution order is Ar>O 2>N 2.更多还原