《催化剂 论文催化剂的论文催化剂论文》.doc

催化剂 论文催化剂的论文催化剂论文 反相微乳液法制备负载型TiO2光催化剂 摘 要：以TiCl4为原料、粉煤灰微珠为载体，采用反相微乳液法制备了负载型TiO2光催化剂,讨论了负载对TiO2光催化剂的性能的影响。用热分析仪(DSC-TGA)测定了前躯体的热解行为，通过X射线衍射仪 (XRD) 、扫描电子显微镜（SEM）、红外光谱仪（FTIR）对催化剂的物相、形貌及特征官能团进行表征，并用可见分光光度计测定甲基橙的降解率。结果表明：焙烧温度为550 时，负载型TiO2光催化剂为锐钛矿与金红石混合型，且微珠表面形成一层连续、均匀的薄膜。甲基橙催化降解实验表明：负载型TiO2催化剂对甲基橙的降解率在90 min内达到49%，明显高于未负载型光催化剂。 　　关键词： 负载型TiO2；光催化剂；微乳液 　　中图分类号：O614 文献标识码：A 文章编号：1672-1098(2010)04-0074-05 　　Preparation of Supported TiO2 Photocatalyst by Water-in-oil Microemulsion Reaction 　　HUANG Jing1, XUE Ru-jun1, ZHANG Hong-liu1, LI Li2, DAI Xin-ying1 　　(1. School of Chemical Engineering, Anhui University of Science and Technology, Huainan Anhui 232001, China; 2. Academic Publishing Centre, Anhui University of Science and Technology, Huainan Anhui 232001, China) 　　Abstract:Supported TiO2 photocatalyst was prepared by reverse microemulsion, with TiCl4 as raw material, cenosphere as carrier. Effect of loading on performance of TiO2 photocatalyst was discussed. The pyrolysis behavior of the precursors was characterized by differential scanning calorimetric-thermo-gravimetric analysis (DSC-TGA). The crystal structure, morphology, functional groups of the samples were characterized respectively by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrometer (FTIR). The degradation rate of methyl orange was measured by spectrophotometer. The results showed that the samples are the mixture of anatase and rutile, when the precursor calcined at 550 ℃. A layer of continuous film evenly covers the beads surface. Catalytic degradation experiments showed that methyl orange degradation rate of the samples reaches 49% in 90min utes, which is obviously bigger than TiO2 photocatalyst. 　　Key words:supported TiO2; photocatalyst; microemulsion 　　iO2因其有光催化活性高、稳定性好、对人体无毒、廉价等优点，成为一种绿色环保型光催化剂。而实际应用中，为了充分发挥TiO2在光、电、热、磁等方面的优异性能，往往需要制备出不同粒径、分散均匀的纳米级TiO2粉末［1-2］。TiO2光催化剂主要应用于污水处理，但由于纳米颗粒细微、不易沉淀、催化剂难以回收、活性成分损失大、不利于催化剂的再生。因此，TiO2