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采用溶胶-凝胶法制备系列Nd/Y-TiO_2催化剂,并在光催化反应器中,以亚甲基蓝降解反应为模型对其催化性能进行了测试。考察了稀土负载量、稀土配合比和活化煅烧时间及温度等制备条件对其催化活性的影响。并在单因素试验的基础上,采用响应面法(RSM)对Nd/Y-TiO_2催化剂制备工艺进行了优化,选取稀土负载量、稀土配比及煅烧温度为随机因子,进行3因素3水平的中心组合实验设计,分析了3个因素对响应值的影响。实验结果表明:当稀土负载量为2.2%,煅烧时间3h,煅烧温度480℃,NdxY(1-x)(x=0.79)时降解效果最好。在催化剂用量0.6g/L,亚甲基蓝浓度5mg/L,40W低压汞灯光源下反应2h时降解率可达94.82%。此外,还用XRD和SEM对催化剂进行了表征。
A series of Nd / Y-TiO 2 catalysts were prepared by sol-gel method. Their photocatalytic performance was tested in a photocatalytic reactor with methylene blue as a model. The effects of preparation conditions such as rare earth loading, rare earth compounding ratio, activation calcination time and temperature on the catalytic activity were investigated. On the basis of single factor experiments, the preparation process of Nd / Y-TiO 2 catalyst was optimized by response surface methodology (RSM). The loadings of rare earth, rare earth and calcination temperature were selected as random factors, Central composite experimental design, analysis of the impact of three factors on the response. The experimental results show that the best degradation effect is obtained when the loading of rare earth is 2.2%, the calcination time is 3h, the calcination temperature is 480 ℃ and NdxY (1-x) (x = 0.79). When the amount of catalyst 0.6g / L, methylene blue concentration 5mg / L, 40W low pressure mercury lamp light source reaction 2h degradation rate of 94.82%. In addition, the catalysts were also characterized by XRD and SEM.