Decolorization of the azo dye Reactive Black 5 by Fenton and photo-Fenton oxidation

被引:664
作者
Lucas, MS [1 ]
Peres, JA [1 ]
机构
[1] Univ Tras Os Montes & Alto Douro, Dept Quim, Ctr Quim, P-5000911 Vila Real, Portugal
关键词
textile wastewater; azo dye; Reactive Black 5; advanced oxidation processes (AOP's); Fenton process; photo-Fenton process;
D O I
10.1016/j.dyepig.2005.07.007
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The oxidative decolorization of Reactive Black 5 (RB5) in aqueous solution has been studied using Fenton (H2O2/Fe2+) and photo-Fenton (H2O2/Fe2+ /UV) processes. This investigation reveals that both methods can remove the color of RB5. Batch experiments were carried out to investigate the process's optimal operational conditions: pH, H2O2 dosage, Fe2+ dosage, RB5 concentration and optimal [Fe2+](0)/[H2O2](0/)[RB5](0) ratio, to obtain the bests results at low cost, render AOP competitive with other processes. The optimal conditions found were a ratio [H2O2](0/)[RB5](0) of 4.9:1, a ratio [H2O2](0/)[Fe2+](0) of 9.6A and pH = 3.0. The decolorization experiments indicate that RB5 can be effectively decolorized using Fenton and photo-Fenton processes with a little difference between the two processes, 97.5% and 98.1%, respectively, for optimal conditions. This small difference in dye decolorization is not similar to TOC removal: with photo-Fenton process there is a significant increment (46.4% TOC removal) relatively to Fenton process (only 21.6% TOC removal). This fact indicates that although UV low-pressure mercury lamp has little effect on dye decolorization it is particularly important in dye mineralization. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:236 / 244
页数:9
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