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首页> 外文期刊>Separation and Purification Technology >Fenton and Fenton-like processes for the mineralization of Ponceau S in aqueous solution: Assessment of eco-toxicological effect of post treated solutions
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Fenton and Fenton-like processes for the mineralization of Ponceau S in aqueous solution: Assessment of eco-toxicological effect of post treated solutions

机译：水溶液中Ponceau S矿化的Fenton和类似Fenton的过程：评估后处理溶液的生态毒理作用

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摘要

This study reports the influence of various operational parameters on the decolorization and mineralization of Ponceau S (PS) by HO~· and SO4~(·-) radicals, generated by the activation of oxidants like H2O2 (HP) and (NH4)2S208 (APS) by three transition metal ion catalysts viz. Fe~(2+), Ag~+ and Co~(2+) in the so called Fenton and Fenton-like processes. The most effective catalyst for the activation of both the oxidants is found to be Fe~(2+), although its effect is more for HP than APS. Further, Co~(2+) inhibits mineralization completely when used with HP. The ideal systems for mineralization are Fe~(2+)/HP operating at pHs 3 and 6.6, and Fe~(2+)/APS operating at pH 3. The most significant result of this study is that Fe~(2+)/APS system is applicable at all pH, which is important for real scale applications. As the treated solutions have to be released into the water bodies, the eco-toxicological effect of these solutions on a model microorganism, Escherichia coli were examined based on their metabolic inhibition assay. The treated solutions were found to be more biotoxic than the pure dye solution, the magnitude being more in Fe~(2+)/HP system than in Fe~(2+)/APS system. Thus, metal ion assisted treatment processes are not environmentally benign.
机译：这项研究报告了各种操作参数对HO〜·和SO4〜（·-）自由基（由H2O2（HP）和（NH4）2S208等氧化剂的活化产生的）对Ponceau S（PS）脱色和矿化的影响（ APS）由三种过渡金属离子催化剂组成。 Fe〜（2 +），Ag〜+和Co〜（2+）以所谓的Fenton和类Fenton过程存在。尽管对HP的影响比对APS的影响更大，但发现用于激活两种氧化剂的最有效催化剂是Fe〜（2+）。此外，与HP一起使用时，Co〜（2+）完全抑制了矿化作用。理想的矿化系统是在pH 3和6.6下运行的Fe〜（2 +）/ HP和在pH 3下运行的Fe〜（2 +）/ APS。该研究的最重要结果是Fe〜（2+） / APS系统适用于所有pH值，这对于实际应用很重要。由于必须将处理后的溶液释放到水体中，因此根据它们的代谢抑制试验检查了这些溶液对模型微生物大肠杆菌的生态毒理作用。发现处理过的溶液比纯染料溶液具有更高的生物毒性，在Fe〜（2 +）/ HP体系中的幅度大于在Fe〜（2 +）/ APS体系中的幅度。因此，金属离子辅助的处理过程在环境上不是良性的。

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