TiO2气凝胶光催化剂的制备及响应面优化的研究

Study on synthesis and response surface methodology of TiO2 aerogel photocatalyst

研究了应用于光催化的TiO2气凝胶的最佳制备工艺条件.使用溶胶凝胶法制备TiO2气凝胶,选取乙醇用量、钛水物质的量、锻烧温度为影响因素,罗丹明B(RhB)的去除率为响应值,根据响应面BoxúBenhnken试验设计原理,采用三因子三水平的分析法模拟得到二次多项式回归方程的预测模型,优化TiO2气凝胶的制备工艺.TiO2气凝胶的最佳工艺条件为,乙醇用量为20mL,钛水物质的量比为4∶1,锻烧温度为573℃.在此条件下制备的TiO2气凝胶对RhB去除率可达到98.12%,与预测值98.91%高度相符.

The objective of this paper is to optimize the synthesis conditions of TiO 2 aerogel photocatalyst. The TiO 2 aerogel was synthesized by sol-gel methord. The response surface methodology was used to investigate the effects of processing parameters, including ethanol dosage, mole ratio of titanium to water, and calcination temperature. The removal rate of rhodamine-B (RhB)was chosen as response value, mathematical model was established by implementing three factors and three levels. The optimum technological conditions were ethanol dosage of 20 mL, mole ratio of titanium to water of 4∶1, and calcination temperature of 573 ℃. The removal rate of RhB was up to 98.12%, which was highly consistent with the predictive value of 98.91%.