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用溶胶-凝胶法结合真空干燥技术,制备Pr-Ce-Mn干凝胶,经900℃热处理获取Ce掺杂的超细钙钛矿型PrMnO3+λ,用TG-DTA、XRD、FT-IR、TEM等手段进行表征,以甲基橙的光催化降解测试超细粒子的光催化活性;重点考察Ce掺杂对钙钛矿型PrMnO3的结构及光催化性能的影响。结果表明,Pr-Mn干凝胶热处理时,Pr影响Mn的晶化,500℃时出现晶相Pr6O11,700℃时产生晶相Mn2O3,900℃时得到粒径小于100 nm的斜方晶系钙钛矿型PrMnO3类球形颗粒;Pr-Ce-Mn干凝胶经900℃热处理可得粒径小于30 nm的形状不规则的Ce掺杂PrMnO3+λ颗粒,Ce掺杂增加了超细粒子中阳离子空位和氧缺陷,明显提高了其光催化活性。
Pr-Ce-Mn xerogels were prepared by sol-gel method and vacuum drying technique. Ce-doped ultrafine perovskite-type PrMnO3 + λ was obtained by thermal treatment at 900 ℃. , TEM and other means to test the photocatalytic degradation of methyl orange photocatalytic activity of ultrafine particles; focusing on Ce doping on the structure of the perovskite PrMnO3 and photocatalytic properties. The results showed that when Pr-Mn xerogels were heat-treated, Pr affected the crystallization of Mn, the crystal phase Pr6O11 appeared at 500 ℃, Mn2O3 was formed at 700 ℃, and the orthorhombic calcium The Pr-Ce-Mn xerogel spherical particles can be obtained by heat treatment of Pr-Ce-Mn xerogel at 900 ℃ with irregularly shaped Ce-doped PrMnO3 + λ particles with particle size less than 30 nm. Vacancies and oxygen defects, significantly improve its photocatalytic activity.