拟因素法正交试验设计优化纳米ZnO-SnO_2的制备  

Optimizing the preparation of nanometer ZnO-SnO_2 coupled oxide by dummy factor orthogonal experimental design

作　　者：陶红艳[1] 张运陶[1] 

机构地区：[1]西华师范大学应用化学研究所,四川南充637002

出　　处：《计算机与应用化学》2011年第10期1289-1293,共5页Computers and Applied Chemistry

基　　金：四川省科技厅应用基础研究项目(2008JY0155).

摘　　要：以沉淀反应时间(A)、Zn/Sn反应剂量摩尔比(B)、沉淀剂与总金属离子溶液(ZnSO_4溶液和SnCl_4溶液)的体积比(C)、熟化时间(D)、煅烧时间(E)、煅烧温度(F)6个因素作为影响制备复合催化剂ZnO-SnO_2的主要因素,采用拟因素法正交试验设计按正交试验设计表L_(16)(2^(15))安排纳米ZnO-SnO_2的制备实验。获得纳米ZnO-SnO_2复合催化剂的优化制备条件为:A=8min、B=85:15、C=2:1、D=6 min、E=1h、F=700℃。将优化制备产品用于光催化降解10mg/L的甲基橙溶液30 min,3次实验结果溶液脱色率DC平均值为99.05%,与按效应计算的估计值97.78%的相对误差仅为1.27%。通过XRD谱图分析优化制备产品的组成和粒径,确定该复合催化剂的主要成分是ZnO和SnO_2,另有少量的Zn_2SnO_4;粒径主要分布在15-35纳米之间。根据紫外-可见分光光度计的测定结果,计算获得优化制备产品的带隙能(Eg)为3.30 eV,比纳米ZnO的带隙能低0.07 eV。The time of settling reaction （A）, the molar ratio of Zn/Sn （B）, the volume ratio of precipitate and the whole metal ions solution （C）, the time of maturation （D）, the time of calcining （E）, and the temperature of calcining （F） were used as the main factors about the preparation of composite catalysts. The nanometer ZnO-SnO2 experimentations were arranged by dummy factor orthogonal experimental design （L16（2^15））. The optimized experimental conditions obtained are A=8 rain, B =85：15, C=2：1, D=6 min, E=1h, and F=700 ℃. The photocatalytic degradation experiments were carried out using 10 mg/L of methyl orange solution with the optimized products. The average percentage of decolor （DC） is 99.05% in 30 min through three same experiments. Otherwise, the predictive value of DC is 97.78%, which is obtained according to effect calculation. The relative error of the two methods is 1.27%. The optimized product was characterized by X-ray diffraction. The results indicate that its main composition is ZnO and SnO2, besides a little Zn2SnO4, and the main particle size is between 15 and 35 nm. The band gap energy （Eg） of the optimized product is calculated according to the determination result of UV-vis spectrophotometer. Its Eg is 3.30 eV, which is lower than that ofnano-ZnO （3.37 eV）.

关 键 词：ZnO-SnO2 L16(215)正交试验设计 拟因素法 制备条件 优化 

分 类 号：O611[理学—无机化学] O212.6[理学—化学]