采用溶胶-凝胶法结合真空干燥技术制备Pr-Mn-Co干凝胶,经热处理获取超细钙钛矿型PrMn1-x-CoxO3 (x=0,0.1,0.2,0.3,0.4)粒子,产物经XRD、TEM、TG-DTA、FT-IR手段表征考察钴掺杂比例对PrMnO3超细粒子结构的影响.以甲基橙(MO)的光催化降解为探针反应,评价产物的光催化性能.结果显示:Pr-Mn干凝胶热处理时,500℃时出现晶相Pr6O11,700℃时产生晶相Mn2O3,稀土Pr影响Mn的晶化,900℃时得到粒径小于100nm的斜方晶系钙钛矿型PrMnO3类球形颗粒;Pr-Mn-Co干凝胶经900℃热处理,可得粒径约为30 nm的钙钛矿型PrMn1-xCoxO3类球形颗粒,Co离子与Mn离子共同构成PrMn1-xCoxO3晶格的B位结点,经钴掺杂的PrMnO3超细粒子具有更高的光催化活性.
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