Decolorization effects of six azo dyes by O3, UV/O3 and UV/H2O2 processes

被引：153
|
作者：
Shu, HY [1 ]
Chang, MC [1 ]
机构：
[1] Hungkuang Univ, Dept Environm Engn, Taichung 433, Taiwan
来源：
DYES AND PIGMENTS | 2005年 / 65卷 / 01期
关键词：
ultraviolet; advanced oxidation processes (AOPs); azo dye; decolorization; ozone; hydrogen peroxide;
D O I：
10.1016/j.dyepig.2004.06.014
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The decolorization of six azo dyes by means of O-3, UV/O-3 and UV/H2O2 processes was performed successfully with all of the tested dyes decolorizing effectively. However, dyes with dis-azo links (i.e. C.I. Direct Yellow 4 and C.I. Acid Black 1) were more difficult to decolorize than mono-azo dyes. During the processes, the pH value changed from 5.4 to 3.5, thus becoming more acidic. The increased acidity resulted from the oxidation and breakdown of the R+-(SO3-) bond in the azo dye structure. The removal of 95% color was the level chosen to compare the energy efficiency. The results showed that UV/H2O2 used the most energy, 5-11 times, than that of UV/O-3 process, and 265-520 times more than that of the ozonation process. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码：25 / 31
页数：7
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