López-López A, Pic J S, Debellefontaine H
Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco CIATEJ-Av. Normalistas 800, Colinas de la Normal, Guadalajara Jalisco, CP 44270, Mexico.
Chemosphere. 2007 Feb;66(11):2120-6. doi: 10.1016/j.chemosphere.2006.09.025. Epub 2006 Dec 12.
Azo dye ozonation was carried in a semi-batch reactor to evaluate both the molecular and radical contributions of ozone on the dye decay. From two mass balance equations, the simultaneous determination of mass transfer, self-decomposition and solubility parameters of ozone were determined; thus establishing the steady state conditions in the experimental system. The results of kinetic studies showed that the decay of azo dye was a pseudo-first-order reaction with respect to dye concentration and the overall rate constant increased with an increase in the pH, however declined with an increase in the dye concentration. Furthermore, from the overall rate constants obtained at various pH values a mathematical analysis of dye decay was performed, which provides a practical new method to quantify the radical and molecular contributions in the ozonation of azo dyes.
在半间歇式反应器中进行偶氮染料臭氧化反应，以评估臭氧对染料降解的分子贡献和自由基贡献。通过两个质量平衡方程，同时测定了臭氧的传质、自分解和溶解度参数；从而确定了实验系统中的稳态条件。动力学研究结果表明，偶氮染料的降解相对于染料浓度是准一级反应，总速率常数随pH值的增加而增大，但随染料浓度的增加而减小。此外，根据在不同pH值下获得的总速率常数，对偶氮染料的降解进行了数学分析，这为量化偶氮染料臭氧化过程中自由基和分子的贡献提供了一种实用的新方法。
