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

页码：25 / 31

页数：7

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