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首页> 外文期刊>Dyes and Pigments >Photocatalytic degradation of azo dye (Reactive Red 120) in TiO2/UV system: Optimization and modeling using a response surface methodology (RSM) based on the central composite design
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Photocatalytic degradation of azo dye (Reactive Red 120) in TiO2/UV system: Optimization and modeling using a response surface methodology (RSM) based on the central composite design

机译：TiO2 / UV系统中偶氮染料（活性红120）的光催化降解：基于中央复合设计的响应表面方法（RSM）优化和建模

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The aim of our research was to apply experimental design methodology in the optimization of photocatalytic degradation of azo dye (Reactive Red 120). The reactions were mathematically described as the function of parameters such as amount of TiO2 (X_1), dye concentration (X_2) and UV intensity (X_3), and were modeled by the use of response surface methodology (RSM). These experiments were carried out as a central composite design (CCD) consisting of 20 experiments determined by the 2~3 full factorial designs with six axial points and six center points. The degradation of azo dye (RR120) followed an apparent first-order rate law in every pH condition. The results show that the responses of color removal (%) (Y_1) in photocatalysis of dyes were significantly affected by the synergistic effect of linear term of UV intensity (X_3) and the antagonistic effect of quadratic term of UV intensity (X_3~2). Significant factors and synergistic effects for the TOC removal (%) (Y_2) were the linear terms of TiO2 (X_1), and UV intensity (X_3). However, the quadratic terms of TiO2 (X_1~2) and UV intensity (X_3~2) had an antagonistic effect on Y_2 responses. Canonical analysis indicates that the stationary point was a saddle point for Y_1 response whereas a maximum point for Y)2 response. The estimated ridge of maximum responses and optimal conditions for Y_1 and Y_2 using canonical analysis were 100% and 67.27%, respectively. The experimental values agreed with the predicted ones, indicating suitability of the model employed and the success of RSM in optimizing the conditions of photocatalysis.
机译：我们研究的目的是将实验设计方法应用于优化偶氮染料（活性红120）的光催化降解。在数学上将反应描述为参数的函数，例如TiO2的量（X_1），染料浓度（X_2）和UV强度（X_3），并使用响应表面方法（RSM）进行建模。这些实验是作为中央复合设计（CCD）进行的，该设计由20个实验组成，这些实验由2个到3个具有六个轴向点和六个中心点的全因子设计确定。在每种pH条件下，偶氮染料（RR120）的降解遵循明显的一级速率定律。结果表明，紫外线强度的线性项（X_3）的协同作用和紫外线强度的二次项（X_3〜2）的协同作用显着影响染料光催化脱色（％）（Y_1）的响应。 。去除TOC（％）（Y_2）的重要因素和协同效应是TiO2（X_1）和UV强度（X_3）的线性项。然而，TiO2（X_1〜2）和紫外线强度（X_3〜2）的二次项对Y_2反应具有拮抗作用。规范分析表明，固定点是Y_1响应的鞍点，而Y）2响应则是最大点。通过规范分析，Y_1和Y_2的最大响应和最佳条件的估计岭分别为100％和67.27％。实验值与预测值一致，表明所用模型的适用性以及RSM在优化光催化条件方面的成功。

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