亚微米菜花?多孔状结构CeO_2的制备及其光吸收特性研究

Preparation of Submicron Cauliflower-like/Porous Structured CeO_2 and Their Optical Absorption Properties

以碳酸铈为铈源制备亚微米多孔状CeO_2,根据碳酸铈在空气和氩气中热分解的热重-差热(TG-DTA)曲线,借助X射线衍射仪(XRD)、扫描电镜(SEM)和紫外-可见分光光度计(UV-Vis)表征碳酸铈在空气和氩气中热分解产物的物相、形貌和光吸收特性。结果表明:在空气中热分解碳酸铈,获得多孔状结构CeO_2,其内部结构由亚微米CeO_2颗粒组成;在氩气中热分解碳酸铈,获得菜花状结构CeO_2,其内部结构由亚微米片状CeO_2组成;在小部分紫外光(370~400nm)和可见光(400~800nm)范围内,在氩气中获得的亚微米菜花状结构CeO_2对光的吸收能力优于在空气中获得的亚微米多孔状结构CeO_2对光的吸收能力。

The pyrolysis of cerium carbonate as the cerium source in the air and the argon gas was based on the curve of its TG-DTA curve. The phases, the morphologies and the optical adsorption properties of the products of the pyrolysis of cerium carbonate in the air and argon gas were characterized with X-ray diffraction （XRD）, scanning electron microscope （SEM） and UV-Visible spectrophotometer （UV-Vis）, respectively. The results show that porous structured CeOz, the inner structure of which is made up of submicron CeO2 particles, is obtained by the pyrolysis of cerium carbonate in the air. Cauliflower-like structured CeOz,the inner structure of which is made up of submicron CeO~ flake,is gained by the pyrolysis of cerium carbonate in the argon gas. In the range of ultraviolet light（370~400 nm） and the visible light（400~800 nm）,the optical adsorption abilities of submicron cauliflower-like structured CeO2 obtained in the argon gas are obvious better than that of submicron porous structured CeO2 gained in the air.