响应曲面法优化电化学氧化技术处理染料废水

采用IR和XRD等手段对自制磷钼酸铁(FePMo12)杂多酸进行表征,表明杂多阴离子具有Keggin结构。将FePMo12负载于修饰后的分子筛上制备FePMo12/APTES-4A催化剂填充于电化学反应器中,考察电化学氧化体系对酸性大红3R染料废水的脱色效果,其脱色率高于二维电化学反应器。利用Box-Behnken中心组合实验设计及响应面(RSM)分析,以pH值,板间距,槽电压,曝气量为实验因素,建立了以酸性大红3R的脱色率为响应值的二次多项式回归模型。研究表明,当电解时间为60 min时,曝气量0.05 m3/h、pH为2、板间距3.0 cm、槽电压11.0 V,在此条件下色度去除率可达69.4%,模型预测值与实验值能很好地吻合。方差分析结果表明,槽电压和pH、pH和曝气量的交互作用对响应值具有显著性影响。

Optimization of electrochemical oxidation of dye wastewater using response surface methodology

A heteropolyacid iron phosphomolybdate (FePMo₁₂) was synthesized with molybdophosphoric acid and ferric salt. Morphologies and microstructures were characterized by IR spectrometry and X-ray diffraction. The heteropolyanion showed a Keggin structure. Electrochemical oxidation of Acid Red 3R was investigated in the presence of FePMo₁₂ supported on modified 4A molecular sieve as packing materials in the reactor. The decolorization efficiency was higher than that in two-dimension electrochemical cell. Box-Behnken design (BB) coupled with response surface methodology (RSM) was used to investigate the optimization of electrochemical degradation of dye wastewater. The relationship of electrolytic voltage, initial pH, air-flow and electrode span was quantitatively analyzed. A mathematical predictive model was established with the decolorization efficiency as response value. The results showed that the optimal technological conditions for decolorization of Acid Red 3R simulated wastewater were as follows: electrolytic voltage of 11.0 V; initial pH of 2; air-flow of 0.05 m³/h; electrode span of 3.0 cm. Under the optimized conditions, the decolorization efficiency reached 69.4% after 60 min. The calculated values of the model agreed well with the experimental data. The interaction of electrolytic voltage and initial pH, initial pH and air-flow had significant impacts on the response value by analysis of variance.