Benitez F Javier, Real Francisco J, Acero Juan L, Leal Ana I, Cotilla Sonia
Departamento de Ingeniería Química y Energética, Universidad de Extremadura, Badajoz, Spain.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2005;40(12):2153-69. doi: 10.1080/10934520500234650.
Acetovanillone [Ethanone, 1-(4-hydroxy-3-metoxyphenyl)] is one of the major pollutants that is present in the wastewater produced during the boiling of raw material in the cork industry. The oxidation of its aqueous solutions by monochromatic UV radiation alone and combined with hydrogen peroxide, Fenton's reagent and the photo-Fenton system has been investigated. In the single UV radiation process, the apparent rate constants and the quantum yields are determined, and in the UV/H2O2 combination, the additional efficiency in the oxidation process due to the presence of hydrogen peroxide is established. The influence of some operating variables, such as initial concentrations of H2O2 and Fe(II), as well as the pH, is discussed in the Fenton and photo-Fenton systems, and the partial contribution of the radical pathways to the global oxidation rates are evaluated. The rate constant for the reaction of acetovanillone with hydroxyl radicals is also determined by means of a competition kinetics model, its value being 5.62 x 10(9) M(-1)s(-1). Finally, chemical oxidation experiments of wastewaters generated in this industry were carried out by using the same advanced oxidation processes. Specifically, the elimination of acetovanillone in these effluents was determined, and the removal of the global organic pollutant content was also evaluated.
乙酰香草酮[1-(4-羟基-3-甲氧基苯基)乙酮]是软木工业中原料煮沸过程产生的废水中存在的主要污染物之一。研究了其水溶液单独被单色紫外辐射以及与过氧化氢、芬顿试剂和光芬顿体系联合作用时的氧化情况。在单一紫外辐射过程中，测定了表观速率常数和量子产率，在紫外/过氧化氢组合体系中，确定了由于过氧化氢的存在而在氧化过程中产生的额外效率。在芬顿和光芬顿体系中讨论了一些操作变量的影响，如过氧化氢和亚铁离子的初始浓度以及pH值，并评估了自由基途径对总氧化速率的部分贡献。还通过竞争动力学模型确定了乙酰香草酮与羟基自由基反应的速率常数，其值为5.62×10⁹ M⁻¹s⁻¹。最后，采用相同的高级氧化工艺对该行业产生的废水进行了化学氧化实验。具体而言，测定了这些废水中乙酰香草酮的去除情况，并评估了总有机污染物含量的去除情况。
