Fabrication And Photocatalytic Properties Of Rare Earth Perovskite-type Oxides Nanobelts

Rare earth perovskite-typed composite oxides(ABO3) are new types of inorganic non-metallic materials with stable crystal structure and unique physical and chemical properties. They have drawn more and more attention of scientists in the field of solid fuel cell, solid electrolyte, sensor and catalysis, especially in photocatalysis. Electrospinning is a new method for preparation of nanomaterials and a lot of one-dimensional nanomaterials have been prepared by electrospinning. It is an important and urgent research subject to fabricate rare earth perovskite-type oxides nanobelts via electrospinning technique.In this dissertation, inorganic metallic salts were used as raw materials, PVP was employed as template and DMF as solvent. PVP/metallic salts composite nanobelts were fabricated by combination of sol-gel and electrospinning. LaM03(M=Cr,Fe,Mn,Co,Ni,Al) nanobelts were prepared by calcination of the relevant composite nanobelts at 600℃-800℃The samples were characterized by thermogravimetric-differential thermal analysis(TG-DTA), X-ray diffractometry(XRD), scanning electron microscopy(SEM). energy dispersive spectroscopy(EDS) and Fourier transform infrared spectroscopy(FTIR). It is found that the composite nanobelts were smooth and uniform, and the width and thickness are 7-19μm and 300-600nm, respectively. LaCrO3 and LaFeO3 nanobelts obtained were orthorhombic in structure which width was 2-8μm and thickness was ca. 100nm; LaMnO3. LaCoO3. LaNiO3 and LaAlO3 nanobelts were rhombohedral system which were 2-7μm in width and ca. 100nm in thickness. And the rare earth perovskite oxides nanobelts became rougher, narrower and thinner than the relevant composite nanobelts.The photocatalytic activities of LaMO3(M=Cr, Fe) nanobelts were studied by taking rhodamine B as degradation agent under illumination of ultraviolet ray. Under the existence of LaCrO3(800℃) nanobelts, the degradation rate of rhodamine B reaches 94.55% after illuminated for 200min; under the existence of LaFeO3(800℃) nanobelts. the degradation rate of rhodamine B reaches 89.56% after illuminated for 180min.The formation mechanism of LaMO3 nanobelts was also discussed and some new meaningful results are obtained.