Application of response surface methodology to the decolorization by the electrochemical process using FePMo12O40 catalyst
Application of response surface methodology to the decolorization by the electrochemical process using FePMo12O40 catalyst
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DOI：
10.1016/j.jiec.2014.05.003
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发表时间：
2015-01
影响因子：
6.1
通讯作者：
Lin Yue;L. Wang;Feng Shi;Jianbo Guo;Jing-liang Yang;J. Lian;Xiao Luo
中科院分区：
文献类型：
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作者：
Lin Yue;L. Wang;Feng Shi;Jianbo Guo;Jing-liang Yang;J. Lian;Xiao Luo
以FePMo 12-APS-MS 4A为催化剂，采用响应面法优化了酸性红3R的电化学氧化脱色工艺条件。采用傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）、扫描电镜（SEM）和X射线荧光光谱（XRF）对FePMo 12-APS-MS 4A的微观结构和形貌进行了表征。采用Box-Behnken设计（BBD）的响应面法对4个控制因素进行了全面分析。以脱色率为响应值，建立了二次多项式模型。模型分析表明，槽电压和气流量对脱色率有正向影响，初始pH和极距对脱色率有负向影响。研究了槽电压与初始pH、初始pH与气流的相互作用。在最佳条件下，反应60 min，色度、COD和TOC的去除率分别达到67.3%、58.4%和47.9%。液相色谱-质谱联用（LC-MS）分析表明，染料分子经历了一系列的还原和氧化反应，包括偶氮键断裂、磺化和脱氮。提出了该反应过程的可能机理。
In order to optimize the experimental conditions, the decolorization of Acid Red 3R by electrochemical oxidation process with catalyst FePMo12-APS-MS4A as packing was performed using response surface methodology (RSM). The microstructure and morphology of FePMo12-APS-MS4A were characterized with Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray fluorescence spectroscopy (XRF). Four control factors were throughly analyzed by means of RSM based on Box–Behnken design (BBD). Taking the decolorization efficiency as response value, a second order polynomial model was established. The model and analysis strongly indicated that the cell voltage and airflow caused positive, and the initial pH and inter-electrode distance caused negative effect on the decolorization efficiency. The interaction between cell voltage and initial pH, initial pH and airflow were also revealed. Under the optimal conditions, the color, COD and TOC removal efficiency reached 67.3%, 58.4% and 47.9% after 60 min. Liquid chromatography–mass spectrometry (LC–MS) analysis revealed that the dye molecule underwent a series of reduction and oxidation steps, including azo bond fracture, desulfonation and denitrogenation. The possible mechanisms involving in this reaction process were proposed.