试验设计优化Mn掺杂ZnO纳米催化剂的制备  

Optimizing the preparation of Mn doped ZnO nanometer catalysts by 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》2012年第6期709-714,共6页Computers and Applied Chemistry

基　　金：四川省科技厅应用基础研究项目(2008JY0155)

摘　　要：按25部分因子试验设计安排实验，以光催化降解甲基橙（MO）溶液脱色率DC（％）为目标值，考察掺锰量VMnNO3、熟化温度乃、熟化时间tl、煅烧温度乃和煅烧时间t2对制备的Mn掺杂纳米ZnO光催化性能的影响，经分析确定影响产品光催化性能的主要因素为VMnNO3、T1和T2.以此3因素按32全因子试验设计进行实验并分析试验结果，获得Mn掺杂纳米ZnO光催化剂的优化制备条件为VMnNO3=O．5mL、T1=70℃、tl=15min、T2=600℃和t2=2．5h。O．05g优化制备产品在紫外光照射下光催化降解100mL10mg／L的MO溶液30min的DC实验平均值为95．58，与Minitab软件对产品的优化预测值95．75的相对误差仅为．0．18％；在可见光下降解MO溶液120min的DC实验平均值为65．11。XRD和SEM对优化产品的表征表明，其主要由粒径分布在（20～30）nm的不规则的颗粒状纳米ZnO组成。由紫外-可见分光光度计测定并计算得出优化产品的带隙能Eg约为3．25eV，较同等条件下制得的纳米ZnO带隙能丘（3．36eV）低0．11eV。The content of mixed Mn （VMnNO3）, the temperature of maturation （Tl）, the time of maturation （tl）, the temperature of calcining （T2）, and the time of calcining （t2） were used as the investigation factors of Mn doped ZnO nanometer photo-catalytic. Methyl orange solution （MO） was degradated by the preparation photo-catalytic to test its photo-catalytic activity. First, the Mn doped ZnO experimentations were arranged by 25 part factorial design, and these experiment data were analyzed by Minitab soft to search for the influencing factors about the preparation products＇ photo-catalytic activity. We have found that the best factors were VMnNO3, T1 and T2. Secondly, we have also investigated the best factors of the photo-catalytic synthesized by analyzing the experiment data based on 32 full factorial design. Finally, the optimized experimental conditions obtained are VMnNO3 = 0.5 mL, T1 = 70 ℃, tl = 15min, T2 = 600 ℃ and t2 = 2.5 h. The 100 mL MO solution （10 mg/L） Was degraded with the optimized product （0.05 g） under UV irradiation. The average decoloration rate （DC） is 95.58% in 30 min through three same experiments. Otherwise, the predictive value of DC is 95.75%, which is obtained according to full factorial analyse of Minitab 15.0. The relative error between experiment and predictive value is -0.18%. Moreover, the same MO solution was also degraded by the optimized product under visible light irradiation, and the average of DC is 65.11% in 120 min through three same experiments. The optimized product was characterized by X-ray diffraction and SEM, indicating that its main composition is ZnO and the main particle size is between 20 and 30 nm. The band gap energy （Eg） of the optimized product is calculated according to UV-vis spectrophotometer. Its Eg value is 3.25 eV, which is lower 0.11 eV than that ofnano-ZnO （3.36 eV） in the same experin.,：ntal condition.

关 键 词：MN掺杂 纳米ZnO光催化剂 2~5部分因子试验设计 3~2全因子试验设计 优化制备 

分 类 号：O641[理学—物理化学]