自组装Fe2O3超薄圆饼的制备及其可见光催化性能

Preparation and Visible Photocatalytic Properties of Self-Assembly Fe2O3 Ultrathin Round Plate

采用水热法成功制备出厚度约为6 nm、直径为(90±10)nm的Fe2O3超薄圆饼结构。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、Brunauer-Emmett-Teller (BET)和紫外可见光分光光度计(UV-Vis)等测量手段分别对样品的结构、形貌、比表面积和光电性能进行表征,结果表明:Fe2O3超薄圆饼结构由平均直径为5.5 nm,比表面积高达256.2 m^2·g^-1的超细Fe2O3纳米颗粒组装而成,超细Fe2O3纳米颗粒的组装造成其颗粒间存在较多间隙,这就使Fe2O3超薄圆饼的最终产物上具有大量的活性位点,为其光催化应用提供了良好的条件。在可见光照射下,材料对罗丹明B、刚果红和甲基橙三种不同类型染料分子的光催化实验结果表明,由(001)裸露晶面为主导的Fe2O3超薄圆饼对阳离子型的染料分子具有优异的可见光催化性能。

The structure of Fe2O3 ultrathin round plate with a thickness of about 6 nm and a diameter of(90±10)nm was successfully prepared by the hydrothermal method.The structures,morphologies,specific surface areas and photoelectric properties of the samples were characterized by the X-ray diffractometer(XRD),scanning electron microscope(SEM),transmission electron microscope(TEM),Brunauer-Emmett-Teller(BET)and ultraviolet-visible spectrophotometer(UV-Vis).The results show that the structure of the Fe2O3 ultrathin round plate is composed of ultrafine Fe2O3 nanoparticles with an average diameter of 5.5 nm and the specific surface area of 256.2 m^2·g^-1.The assembly of the ultrafine Fe2O3 nanoparticles causes more gaps among the particles,resulting in a large number of active sites on the final product of the Fe2O3 ultrathin round plate,which provides a good condition for the photocatalytic application of the Fe2O3 ultrathin round plate.Under visible light irradiation,the photocatalytic experiments on three different types of dye molecules,such as Rhodamine B,Congo Red and methyl orange show that the Fe2O3 ultrathin round plate dominated by(001)bare crystal surface has excellent visible photocatalytic properties for cationic dye molecules.