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首页> 外文期刊>Coloration Technology >Ozonation of the reactive dye intermediate 2-naphthylamine 3,6,8-trisulphonic acid (K-Acid): kinetic assessment, ozonation products and ecotoxicity
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Ozonation of the reactive dye intermediate 2-naphthylamine 3,6,8-trisulphonic acid (K-Acid): kinetic assessment, ozonation products and ecotoxicity

机译：活性染料中间体2-萘胺3,6,8-三磺酸（K-酸）的臭氧化：动力学评估，臭氧化产物和生态毒性

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摘要

Ozonation of the commercially important, recalcitrant reactive dye intermediate 2-naphthylamine 3,6,8-trisulphonic acid (K-Acid) was investigated. Ozonation performance was examined by following ozone absorption rates and K-Acid, chemical oxygen demand and total organic carbon removals. Mean oxidation states and unidentified organic products were also determined. At pH 3, where direct ozone reactions are dominant, the second-order rate constant between K-Acid and molecular ozone was determined as 20 m~(-1) s~(-1) for steady-state aqueous ozone concentration. The competition kinetics approach was also adopted where a reference compound, phenol, and K-Acid were subjected to ozonation. By applying this method, the second-order reaction rate constant was found to be 76 m~(-1) s~(-1). Common oxidation products formed during ozonation at pH 3, pH 7 and pH 7 with 1 mM hydrogen peroxide were identified as methoxy-phenyl-oxime, phenol, benzene, benzaldehyde and oxalic acid via high-performance liquid chromatography and gas chromatography/mass spectrometry analyses. Continuous nitrate and sulphate evolution were observed during K-Acid ozonation as a consequence of the abrupt release and subsequent oxidation of its amino and sulphonate groups. The number and amount of reaction products were most intensive for K-Acid ozonation at pH 7 with 1 mM hydrogen peroxide. According to the acute toxicity tests conducted with Vibrio fischeri, ozonation products were not less toxic than the original K-Acid solution that caused only 15% inhibition.
机译：研究了商业上重要的难降解的活性染料中间体2-萘胺3,6,8-三磺酸（K-酸）的臭氧化作用。通过跟踪臭氧吸收速率和钾酸，化学需氧量和总有机碳去除量来检查臭氧化性能。还确定了平均氧化态和不确定的有机产物。在pH 3下，直接的臭氧反应占主导地位，对于稳态的含水臭氧浓度，K-酸和分子臭氧之间的二级速率常数确定为20 m〜（-1）s〜（-1）。还采用了竞争动力学方法，其中对参考化合物，苯酚和K-酸进行了臭氧化处理。应用该方法，发现二阶反应速率常数为76 m〜（-1）s〜（-1）。通过高效液相色谱和气相色谱/质谱分析，在pH 1，pH 3，pH 7和pH 7臭氧氧化期间形成的常见氧化产物被鉴定为甲氧基-苯基肟，苯酚，苯，苯甲醛和草酸。 。由于其氨基和磺酸基团的突然释放和随后的氧化，在K-酸臭氧化过程中观察到连续的硝酸盐和硫酸盐释放。在1 mM过氧化氢下，pH值为7的K-酸臭氧化反应时，反应产物的数量和数量最密集。根据用费氏弧菌进行的急性毒性试验，臭氧化产品的毒性不低于仅引起15％抑制作用的原始K-酸溶液。

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  • 来源
    《Coloration Technology》 |2012年第5期|p.387-394|共8页
  • 作者

    Idil Arslan-Alaton; Gulcan Basar; Tugba Olmez-Hanci;

  • 作者单位

    Department of Environmental Engineering, Faculty of Civil Engineering, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey;

    Department of Environmental Engineering, Faculty of Civil Engineering, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey;

    Department of Environmental Engineering, Faculty of Civil Engineering, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey;

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