响应曲面法优化C/Fe-Bi_2WO_6光催化降解氧氟沙星

Photocatalytic degradation optimization of OFLX by using C/Fe-Bi_2WO_6 with response surface methodology

通过两步法制备C/Fe-Bi2WO6,利用SEM、XRD和EDS等表征手段,对所制备的样品的形貌及微观结构进行了表征。对氧氟沙星(OFLX)模拟废水进行降解实验,通过单因素实验确定主要影响因素和水平后,利用响应曲面法(RSM)对C/Fe-Bi2WO6的光催化降解的主要影响因素进行优化。通过分析实验结果,建立了C/Fe-Bi2WO6光催化降解氧氟沙星的二次多项式模型,预测处理最佳实验条件为:pH为6.45,H2O2的浓度为208.36 mg/L,C/Fe-Bi2WO6浓度0.55 g/L和氧氟沙星浓度为7.62 mg/L。在最佳条件下进行验证实验,发现实验去除率与预测去除率具有良好的一致性,相对误差为2.3%。

C /Fe-Bi2WO6 was prepared via a two-step method which involving resin carbonization and hydrothermal process. SEM,XRD and EDS were employed to characterize C /Fe-Bi2WO6. Experimental design methodology was applied by response surface modeling and optimization of the removal of OFLX. The multivariate experimental design was employed to develop a quadratic model as a functional relationship between the removal efficiency of OFLX and four experimental factors( pH,H2O2 concentration C /Fe-Bi2WO6 concentration,and OFLX concentration). The optimal values of the operation parameters under the related constraint conditions were found at pH 6. 45,H2O2 concentration of 208. 36 mg /L,C /Fe-Bi2WO6 concentration of 0. 55 g /L and OFLX concentration of 7. 62 mg /L,respectively. In addition,a satisfactory goodness-of-fit was achieved between the predictive and the experimental results,the relative error between actual and predicted values is 2. 3%.