响应面优化光催化降解低浓度富马酸废水

采用TiO2光催化氧化处理低浓度富马酸废水。在单因素实验基础上,通过响应面分析法中Box-Behnken进行实验设计,以废水初始浓度、pH值、催化剂投入量及光照时间作为变量,以废水的降解率作为响应量,研究不同变量对富马酸废水降解效率的影响及其交互作用。实验结果表明,该处理方法对富马酸废水具有很好的降解效率,光催化降解富马酸过程符合一级降解动力学过程;二次多项式的拟合优化结果表明,光照时间和废水pH值的交互作用显著。优化出的降解低浓度富马酸的最佳工艺条件是:废水初始浓度为68.76 mg/L时,催化剂投加量为0.06 g,pH值为5.01,反应时间为48.67 min,在该操作条件下降解效率可以达到97.41%。

Research on Photocatalytic Degradation of Low Concentration Fumaric Acid Waste Water by Response Surface Methodology

The advanced oxidation process of TiO2 photocatalytic oxidation were used for degradation of the low concentration fumaric acid waster water. The experiments were on the basis of the single-factor experiment and the Box-Behnken experimental design of Response Surface Methodology （RSM）. The initial concentration of the waste water, pH, TiO2 and the irradiation time were considered as the factors while the degradation rate was the response value of RSM. The research investigated the degradation of the fumaric acid under different conditions and interaction between them. The result showed that fumaric acid can be degraded efficiently and degradation process was followed the first-order kinetics. The optimized result by the quadratic polynomial indicated significant interaction between irradiation time and pH. And it also optimized the best conditions of photocatalytic oxidation system to degrade low concentration fu-maric acid：0.06 g TiO2, pH=5.01 and 48.67 min reaction time. The degradation rate was 97.41%under the best conditions when initial concentration is 68.76 mg/L.