Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan.
J Environ Sci (China). 2010;22(9):1455-61. doi: 10.1016/s1001-0742(09)60275-8.
The decolorization of Reactive Yellow 86 (RY 86), one of reactive azo dyes, was investigated in the presence of Fenton reagent under solar light irradiation. The decolorization rate was strongly influenced by pH, initial concentrations of H2O2 and Fe(II), and so on. An initial concentration of 40 mg/L was decolored more than 90% after 20 min under optimum conditions. The activation energy of the solar photo-Fenton reaction was 1.50 kJ/mol for RY 86 in the temperature range of 10-60 degrees C. In the kinetic study, the rate constant of RY 86 with OH. radicals could be estimated to be 1.7 x 10(10) L/(mol.sec). The decolorization efficiency of RY 86 under solar light irradiation was comparable to the artificial light irradiation. The decrease of TOC as a result of mineralization of RY 86 was observed during photo-Fenton process. The rate of RY 86 mineralization was about 83% under UV irradiation after 24 hr. The formation of chloride, sulfate, nitrate and ammonium ions as end-products was observed during the photocatalytic process. The decomposition of RY 86 gave two kinds of intermediate products. The degradation mechanism of RY 86 was proposed on the base of the identified intermediates.
在太阳光照下，用过氧化氢/亚铁离子体系（芬顿试剂）处理活性艳黄 86（RY 86），考察其脱色性能。结果表明，pH 值、H2O2 和 Fe(II)的初始浓度等因素对染料的脱色效果有显著影响。在最佳条件下，初始浓度为 40mg/L 的 RY 86 经过 20min 后可达到 90%以上的脱色率。RY 86 在 10-60℃温度范围内的太阳光芬顿反应的活化能为 1.50kJ/mol。动力学研究表明，RY 86 与·OH 自由基的反应速率常数可估算为 1.7×10(10)L/(mol·s)。在太阳光照下，RY 86 的脱色效率与人工光照相当。在光芬顿过程中，观察到 RY 86 的TOC 随着矿化而降低。在 24 小时的 UV 光照下，RY 86 的矿化率约为 83%。在光催化过程中，观察到了氯离子、硫酸根离子、硝酸根离子和铵根离子等作为终产物的形成。RY 86 的降解产生了两种中间产物。根据鉴定出的中间产物，提出了 RY 86 的降解机制。
