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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Degradation of Reactive Azo Dyes by UV/H_2O_2: Impact of Radical Scavengers
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Degradation of Reactive Azo Dyes by UV/H_2O_2: Impact of Radical Scavengers

机译：UV / H_2O_2降解活性偶氮染料：自由基清除剂的影响

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摘要

Hydroxyl radical (·OH) scavenging effects of carbonate (CO_3~(2-)), bicarbonate (HCO_3~-) and chloride (Cl~-) ions on the performance of an ultraviolet light-hydrogen peroxide (UV/H_2O_2) advanced oxidation process were investigated using a reactive azo dye, C.I. Reactive Red 141 as the model compound. It was found that in the absence of scavengers, complete color removal was possible in 15 min under the experimental conditions employed. The rate of color decay was inhibited remarkably with increasing concentrations of bicarbonate and carbonate species, especially when the distribution of alkalinity favored the dominance of carbonate ions. It was further observed that chloride inhibited the rate only when it was between 100-1250 mM as Cl~-, and was ineffective at higher concentrations.
机译：碳酸根（CO_3〜（2-）），碳酸氢根（HCO_3〜-）和氯离子（Cl〜-）清除自由基（·OH）对紫外光-过氧化氢（UV / H_2O_2）高级氧化性能的影响使用活性偶氮染料CI对工艺进行了研究活性红141作为模型化合物。发现在不存在清除剂的情况下，在所采用的实验条件下，可以在15分钟内完全去除颜色。随着碳酸氢盐和碳酸盐种类浓度的增加，颜色衰减的速率受到显着抑制，特别是当碱度分布有利于碳酸盐离子占优势时。进一步观察到，氯化物仅在Cl 2-在100-1250mM之间时才抑制该速率，并且在较高浓度下无效。

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