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采用序贯实验思路,首先基于Plackett-Burman(PB)设计实验数据,经主效应分析和逐步回归筛选出影响制备ZnO/SnO_2粉体性能的主要因素;再以筛选出的Zn/Sn摩尔比及反应时间2个因素设计U_(12)(4×3)均匀设计实验,用PSO-2次回归方法基于该实验数据建立制备ZnO/SnO_2粉体光催化降解甲基橙脱色率DC的预测模型,通过非线性规划求模型最优解获得优化的ZnO/SnO_2制备条件。将在优化条件下制备获得的ZnO/SnO_2粉体用于光催化降解甲基橙,降解30min的DC实验平均值为96.17,模型预测值则为DC=95.66,DC实验值与预测值相对误差仅为0.53%,表明模型可靠。对该粉体采用XRD和SEM进行形貌、粒径及组成分析,表征结果显示该粉体大致呈球形、粒径主要分布在(20～30)rm,粉体中有少量Zn_2SnO_4产生。
Based on the experimental data of Plackett-Burman (PB) design, the main factors influencing the properties of ZnO / SnO_2 powders were screened out by principal effect analysis and stepwise regression. Then, the Zn / Sn molar ratios Reaction time 2 U2 (12) (4 × 3) uniform design experiments were designed. Based on the experimental data, PSO-2 regression method was used to establish a predictive model for the preparation of ZnO / SnO_2 powders for photocatalytic degradation of decolorization rate of methyl orange. Optimum ZnO / SnO 2 preparation conditions were obtained by nonlinear programming and the optimal model was obtained. The ZnO / SnO 2 powders prepared under optimized conditions were used for photocatalytic degradation of methyl orange. The mean value of DC experiment after 30 min of degradation was 96.17, and the predicted value of model was DC = 95.66. The relative error between DC experimental value and predicted value was only 0.53%, indicating that the model is reliable. The morphology, particle size and composition of the powder were characterized by XRD and SEM. The results showed that the powder was roughly spherical, the particle size was mainly distributed in (20 ~ 30) rm, and a small amount of Zn_2SnO_4 was produced in the powder.