Degradation of C.I. Reactive Orange 4 and its simulated dyebath wastewater by heterogeneous photocatalysis

被引:58
作者
Gonçalves, MST [1 ]
Pinto, EMS [1 ]
Nkeonye, P [1 ]
Oliveira-Campos, AMF [1 ]
机构
[1] Univ Minho, Dept Quim, P-4710057 Braga, Portugal
关键词
photocatalytic oxidation; titanium dioxide; decolourisation; reactive dye; CI Reactive Orange 4; azo dye;
D O I
10.1016/j.dyepig.2004.05.004
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The commercial azo dye C.I. Reactive Orange 4 in its reactive and hydrolysed forms can be efficiently photodegraded, using commercial samples of TiO2 as a photocatalyst. With UV light, aqueous solutions containing only dye and no dyebath additives are decolourised slightly more rapidly with Riedel-de-Haen TiO2 than with Degussa P-25 TiO2. The rate of decolourisation increases markedly with increasing pH. Sunlight is also very effective as a light source. On the other hand, comparison experiments involving UV irradiation of hydrolysed and unhydrolysed Reactive Orange 4 in a simulated spent dyebath showed Degussa P-25 TiO2 to be significantly the more efficient catalyst, giving more than 90% decolourisation after 20 min. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:135 / 139
页数:5
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