Rodrigues Carmen S D, Madeira Luis M, Boaventura Rui A R
Department of Chemical Engineering, Faculty of Engineering at Porto University, Laboratory of Separation and Reaction Engineering, Porto, Portugal.
J Hazard Mater. 2009 May 30;164(2-3):987-94. doi: 10.1016/j.jhazmat.2008.08.109. Epub 2008 Sep 10.
Chemical oxidation by Fenton's reagent of a reactive azo dye (Procion Deep Red H-EXL gran) solution has been optimized making use of the experimental design methodology. The variables considered for the oxidative process optimization were the temperature and the initial concentrations of hydrogen peroxide and ferrous ion, for a dye concentration of 100mg/L at pH 3.5, the latter being fixed after some preliminary runs. Experiments were carried out according to a central composite design approach. The methodology employed allowed to evaluate and identify the effects and interactions of the considered variables with statistical meaning in the process response, i.e., in the total organic carbon (TOC) reduction after 120 min of reaction. A quadratic model with good adherence to the experimental data in the domain analysed was developed, which was used to plot the response surface curves and to perform process optimization. It was concluded that temperature and ferrous ion concentration are the only variables that affect TOC removal, and due to the cross-interactions, the effect of each variable depends on the value of the other one, thus affecting positively or negatively the process response.
利用实验设计方法优化了芬顿试剂对活性偶氮染料（普施安深红H - EXL颗粒）溶液的化学氧化过程。在pH值为3.5、染料浓度为100mg/L（经过一些初步实验后固定该值）的条件下，氧化过程优化所考虑的变量为温度、过氧化氢和亚铁离子的初始浓度。实验按照中心复合设计方法进行。所采用的方法能够评估和识别所考虑变量在过程响应（即反应120分钟后总有机碳（TOC）的降低）中的影响及相互作用，并具有统计学意义。在分析的范围内建立了一个与实验数据拟合良好的二次模型，该模型用于绘制响应面曲线并进行过程优化。得出的结论是，温度和亚铁离子浓度是影响TOC去除的唯一变量，并且由于交叉相互作用，每个变量的影响取决于另一个变量的值，从而对过程响应产生正向或负向影响。
