超细prmno3粉末的制备及光催化活性.doc

*通讯联系人：余高奇 (E-mail: yugao_qi666@163.com Tel.: 86-27 通讯地址：湖北省武汉科技大学青山校区化学工程与技术学院153信箱 超细钙钛矿型PrMnO3制备、表征及光催化 付霞1 陈阳1余高奇1，2* 张侃1，2 张光德3 (1. 武汉科技大学化学工程与技术学院，湖北，武汉，430081) (2.武汉科技大学耐火材料与高温陶瓷国家重点实验室培育基地，湖北，武汉，430081) (3. 武汉科技大学汽车与交通工程学院，湖北，武汉，430081) 摘要：以Pr6O11和Mn(NO3)2为主要原料，采用“溶胶-凝胶”法结合“真空干燥”技术制备超细钙钛矿型PrMnO3；用TG-DTA、TEM、XRD、FT-IR等手段进行表征；以紫外灯为光源，用超细PrMnO3光催化降解甲基橙溶液。结果显示：(1) 170℃真空干燥制得的Pr-Mn干凝胶为无定形的疏松土黄色粉末，由大量直径介于10-20nm的球型小颗粒组成；(2) Pr-Mn干凝胶热处理过程中，500℃时出现晶相Pr6O11，700℃时产生晶相Mn2O3，Pr影响了Pr-Mn干凝胶中Mn的晶化，900℃时得到粒径小于100nm结晶度较好的纯晶相钙钛矿PrMnO3；(3)以300w紫外灯为光源，用0.50g超细PrMnO3处理10mg/L甲基橙溶液1000ml，2小时即可完全降解，该降解过程属动力学一级反应。 关键词：超细；PrMnO3；溶胶-凝胶；光催化；动力学 中图分类号：TQ133.3 Preparation, characterization and photocatalysis of ultrafine perovskite PrMnO3 Key Laboratory of Hubei Province for Ceramics and Refractory，Wuhan University of Science and Technology，Wuhan, 430081，China) College of Chemical Engineering and Technology，Wuhan University of Science and Technology, Wuhan,430081,China) Abstract: Using Pr6O11 and Mn(NO3)2 as raw materials, ultrafine perovskite PrMnO3 was prepared by sol-gel method and vacuum drying technology. The material prepared were characterized by TG-DTA、XRD、TEM, and FT-IR. The photocatalytic activity was tested by photocatalysis degrading methyl orange solution in the system of PrMnO3 suspension, irradiated under ultraviolet lamp. The results show: (1) At 170℃, the Pr-Mn xerogel is loose khaki powder with good dispersibility. The xerogel is made up of a mass of global grains with uniform size whose diameters are about 10-20nm. (2) In the process of thermal treating on Pr-Mn xerogel, the crystalline phase Pr6O11 and Mn2O3 appeared at 500℃ and 700℃ respectively; The crystallization process of manganese oxide is affected by Pr; After thermal treating at 900℃, the pure crystalling phase ultrafine perovskite PrMnO3 was prepared, the particle size is smaller than 100nm. (3) Taking the 300w UV lamp as the photo source, 10mg/L methyl orange degradated by the superfine PrMnO3