响应曲面法优化Fe^(2+)活化过硫酸盐降解喹啉工艺研究

Optimization of quinoline degradation in PS/Fe^(2+) system based on response surface methodology

将Fe^(2+)活化过硫酸盐(PS)体系应用于喹啉的去除,并取得较高降解率。研究了过硫酸盐投加量、Fe^(2+)投加量、初始pH对PS/Fe^(2+)体系中喹啉降解的影响。以喹啉降解率为指标,结合响应面法(RSM)中的Box-Behnken方法进行单因素实验,建立了二次多项式模型,进一步得到喹啉降解的最佳反应条件。结果表明,最佳反应条件为:PS/喹啉摩尔比为9.8、PS/Fe^(2+)摩尔比为1.90、初始pH为3.49,此时理论喹啉降解率可达93.7%。相应的验证实验结果与预测值基本一致,证明该模型可信。进一步分析喹啉废水处理前后的三维荧光光谱(3D-EEM)发现,喹啉降解产生腐殖酸类物质且出现荧光峰红移现象,推测反应过程中产生了含有羰基、羧基、羟基和胺基的中间物质。

Fe^(2+)activated persulfate(PS)system is used to remove quinoline and a high degradation rate is achieved.Effects of PS dosage,Fe^(2+)dosage and initial p H on the degradation of quinoline in PS/Fe^(2+)system are studied.Taking the degradation rate of quinoline as an index,a single factor experiment with 3 factors and 3 levels is designed and carried out combining with Box-Behnken principle in response surface methodology(RSM),and a quadratic polynomial model is established to further obtain the optimal reaction conditions for quinoline degradation.The optimal reaction conditions are found as follows:the molar ratios of PS/quinoline and PS/Fe^(2+)are 9.8 and 1.90,respectively,and initial p H is 3.49,under which theoretical degradation efficiency of quinoline shall reach 93.7%.Meanwhile,corresponding verification experiment is conducted under the above reaction conditions,and results show high consistency with the predicted values,indicating the strong credibility of the model.It is found through further analysis on three-dimensional fluorescence spectrum(3 D-EEM)of quinolone-containing wastewater before and after treatment that quinoline degrades to generate humic acids substances and the red shift of the fluorescence peak appears during degradation.It is speculated that intermediate substances consisted of carbonyl,carboxyl,hydroxyl,and amine groups may generate during the whole reaction.