Decomposed characteristic of azo dyes by ozonization with ultrasonic enhancement  

作　　者：Wenrong Hu Haiyan Pei 

机构地区：[1]Shandong Univ, Ctr Environm Res & Technol, Jinan 250061, Peoples R China

出　　处：《Chinese Science Bulletin》2002年第12期986-989,共4页

基　　金：This work was supported by the National Natural Science Foundation of China (Grant No. 59738150);Science Foundation of Shandong Province (Grant No. Q96E01136).

摘　　要：Azo dyes have been used in many industries (textile mill, printing and dyeing mill, paper and pulp mill) and have caused great environmental pollution due to complicated constitution and high chemical stability. The construction of azo dyes can be destroyed by ozonization, but not thoroughly when the ozone dosage is controlled to a certain extent and the operating cost is higher. Ozonization decomposed ability with ultrasonic enhancement on azo dyes has been demonstrated in the study. The conclusion derived from this investigation may be summarized as follows: (1) The decoloration rate of arsenazo I solutions during sono-zone treatment is more rapid than the rate obtained with ozone alone because the complicated constitution has been destroyed by the O free radical from ozone decomposition. (2) The destructing pathway of arsenazo I by ozone with ultrasound is identical with that of by ozone alone: the breakdown of-N=N-bonds, the conversion of benzene ring to car-boxylic acid, and-HSO3 bonds to H2SO4. So,Azo dyes have been used in many industries (textile mill, printing and dyeing mill, paper and pulp mill) and have caused great environmental pollution due to complicated constitution and high chemical stability. The construction of azo dyes can be destroyed by ozonization, but not thoroughly when the ozone dosage is controlled to a certain extent and the operating cost is higher. Ozonization decomposed ability with ultrasonic enhancement on azo dyes has been demonstrated in the study. The conclusion derived from this investigation may be summarized as follows: (1) The decoloration rate of arsenazo I solutions during sonozone treatment is more rapid than the rate obtained with ozone alone because the complicated constitution has been destroyed by the O free radical from ozone decomposition. (2) The destructing pathway of arsenazo I by ozone with ultrasound is identical with that of by ozone alone: the breakdown of -N=N- bonds, the conversion of benzene ring to carboxylic acid, and -HSO3 bonds to H2SO4. So, pH value of the arsenazo I solution continuously drops down to 3.2.

关 键 词：ultrasound ENHANCEMENT O3 oxidation ARSENAZO I . 

分 类 号：X172[环境科学与工程—环境科学]