Effect of organic property acting as a promoter or inhibitor in radical reactions on degradation efficiency of homogeneous catalytic ozonation

ENVR 165

Shao-ping Tong, sptong@zjut.edu.cn1, Wei-ping Liu, toptong@eyou.com2, and Chun-an Ma1. (1) College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Caohuang Road, Hangzhou, 310032, China, (2) Researching Centre of Environmental Science, Zhejiang University of Technology, Caohuang Road, Hangzhou, 310032, China
Homogeneous catalytic ozonation of glycolic acid and acetic acid were carried out at different pH values and the effect of characteristic of organic in propagation of radical reaction on ozonation efficiency was discussed in detail. When the degraded organic was glycolic acid which is a promoter of radical reaction in ozonation, addition of general initiators like Fe2+, OH- could enhance ozonation efficiency obviously and glycolic acid could be destructed at a fast speed. However, when acetic acid, an inhibitor of radical reaction, was degraded by ozonation, the removal rates of acetic acid by Fe2+/O3 and OH-/O3 were similar with that of ozonation alone. These results indicate that characteristic of organic is a decisive factor on degradation efficiencies of conventional advanced oxidation processes based on ozone. Of course, the chemical complex formed from Mn ion with glycolic acid also played an important role in enhancement of ozonation efficiency.
 

General Papers
6:00 PM-8:00 PM, Wednesday, 13 September 2006 Moscone Center -- Hall D, Poster

Sci-Mix
8:00 PM-10:00 PM, Monday, 11 September 2006 Moscone Center -- Hall D, Sci-Mix

Division of Environmental Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006