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首页> 美国卫生研究院文献>Molecules >Use of Titanium Dioxide Photocatalysis on the Remediation of Model Textile Wastewaters Containing Azo Dyes
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Use of Titanium Dioxide Photocatalysis on the Remediation of Model Textile Wastewaters Containing Azo Dyes

机译：二氧化钛光催化在含偶氮染料模型纺织品废水修复中的应用

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摘要

The photocatalytic degradation of two commercial textile azo dyes, namely C.I Reactive Black 5 and C.I Reactive Red 239, has been studied. TiO2 P25 Degussa was used as catalyst and photodegradation was carried out in aqueous solution under artificial irradiation with a 125 W mercury vapor lamp. The effects of the amount of TiO2 used, UV-light irradiation time, pH of the solution under treatment, initial concentration of the azo dye and addition of different concentrations of hydrogen peroxide were investigated. The effect of the simultaneous photodegradation of the two azo dyes was also investigated and we observed that the degradation rates achieved in mono and bi-component systems were identical. The repeatability of photocatalytic activity of the photocatalyst was also tested. After five cycles of TiO2 reuse the rate of colour lost was still 77% of the initial rate. The degradation was followed monitoring the change of azo dye concentration by UV-Vis spectroscopy. Results show that the use of an efficient photocatalyst and the adequate selection of optimal operational parameters may easily lead to a complete decolorization of the aqueous solutions of both azo dyes.
机译：研究了两种商品纺织偶氮染料，即C.I反应性黑5和C.I反应性红239的光催化降解。 TiO 2 P 25 Degussa用作催化剂，并在水溶液中在人工辐射下用125 W汞蒸气灯进行光降解。研究了TiO2用量，紫外线照射时间，处理溶液的pH，偶氮染料的初始浓度以及添加不同浓度的过氧化氢的影响。还研究了两种偶氮染料同时光降解的影响，我们观察到在单组分和双组分体系中实现的降解速率相同。还测试了光催化剂的光催化活性的可重复性。经过五次TiO2重复使用后，颜色损失率仍为初始率的77％。通过UV-Vis光谱法监测降解，监测偶氮染料浓度的变化。结果表明，使用有效的光催化剂和最佳操作参数的适当选择可能容易导致两种偶氮染料的水溶液完全脱色。

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