静电纺丝技术论文：稀土钙钛矿型氧化物纳米带的制备及光催化性质

静电纺丝技术论文：稀土钙钛矿型氧化物纳米带的制备及光催化性质研究

静电纺丝技术论文：稀土钙钛矿型氧化物纳米带的制备及光催化性质研究

【中文摘要】稀土钙钛矿型复合氧化物具有稳定的晶体结构和优异的物化性能,在固体燃料电池、固体电解质、传感器和催化等领域受到越来越多的关注,特别是在光催化领域,成为人们研究的热点。静电纺丝技术是一种制备纳米材料的较新的方法,目前已被用于制备多种一维纳米材料。采用静电纺丝技术制备稀土钙钛矿型复合氧化物纳米带是一个重要而迫切的课题。本论文中采用溶胶-凝胶法与静电纺丝技术相结合,以无机盐为原料,PVP为模板剂,DMF为溶剂,制备了一系列PVP/无机盐复合纳米带,在600℃-800℃进行热处理,得到钙钛矿型复合氧化物LaMO3(M=Cr, Fe, Mn, Co, Ni, Al)纳米带,采用差热-热重(TG-DTA)、X射线衍射(XRD)、场发射扫描电子显微(FE-SEM)、能谱(EDS)和红外光谱(FTIR)等测试技术对样品进行了表征。结果表明,所制备的复合纳米带表面光滑平整,宽度均匀,约7-19μm,厚

300-600nm；LaCrO3和LaFeO3纳米带为正交晶系,宽约2-8μm,厚度约为1OOnm, LaMnO3、LaCoO3、LaNiO3和LaAlO3纳米带为三方晶系,宽度约为2-7μm,厚约100nm。钙钛矿型氧化物纳米带表面粗糙,宽度和厚度有所减小。以罗丹明B为目标降解物研究了LaMO3(M=Cr, Fe)纳米带在紫外灯激发下的光催化活性,LaCrO3(800℃)纳米带光照

200min后对罗丹明B的降解率为94.55%；LaFeO3(800℃)纳米带光照180min后对罗丹明B的降解率为89.56%。讨论了LaMO3纳米带的形

静电纺丝技术论文：稀土钙钛矿型氧化物纳米带的制备及光催化性质研究

成机理,获得了一些有意义的新结果。

【英文摘要】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

静电纺丝技术论文：稀土钙钛矿型氧化物纳米带的制备及光催化性质研究

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.

【关键词】静电纺丝技术 稀土 钙钛矿 纳米带 光催化

【英文关键词】Electrospinning Rare earth

Perovskite Nanobelts Photocatalysis

【目录】稀土钙钛矿型氧化物纳米带的制备及光催化性质研究

静电纺丝技术论文：稀土钙钛矿型氧化物纳米带的制备及光催化性质研究

摘要4-5

9-23ABSTRACT5目录6-9第一章 绪论1.1 静电纺丝技术9-111.1.1 静电纺丝技术基

1.2 本概念9-101.1.2 静电纺丝技术研究进展10-11

稀土钙钛矿型氧化物纳米材料11-21

化物结构特点11-13

究进展13-19

19-211.2.1 稀土钙钛矿型氧1.2.2 稀土钙钛矿型氧化物纳米材料研1.2.3 稀土钙钛矿型氧化物纳米材料的应用21-221.4 本课题研究1.3 纳米带的研究进展

目的及意义22-23

23-25

23

析23第二章 实验试剂、仪器及表征方法2.2 实验仪器2.3.1 差热-热重(TG-DTA)分23-242.3.3 场发射

2.3.5

第2.1 主要实验试剂232.3 表征方法23-252.3.2 X射线衍射(XRD)分析24扫描电子显微分析红外光谱分析242.3.4 能量色散谱分析242.3.6 紫外-可见光谱分析24-25

三章 LaCrO_4和LaCrO_3纳米带的制备、表征及其光催化性质研究

25-353.1 概述25

25-263.2 实验部分25-263.2.2 静电纺丝技术制备

263.2.3 LaCrO_43.2.1 前驱体溶胶的制备PVP/[La(NO_3)3+Cr(NO_3)_3]复合纳米带

和LaCrO_3纳米带的制备26

26

26-27

28-29

30-313.3 结果与讨论26-333.3.2 XRD分析27-283.3.4 EDS分析29-303.2.4 光催化活性评价3.3.1 TG-DTA分析3.3.3 SEM分析3.3.5 FTIR分析3.3.6 LaCrO_4纳米带和LaCrO_3纳米带的光催化活性

静电纺丝技术论文：稀土钙钛矿型氧化物纳米带的制备及光催化性质研究

分析31-32

成机理32-333.3.7 LaCrO_4纳米带和LaCrO_3纳米带的可能形3.4 本章小结33-35

35-44第四章 LaFeO_3纳4.1 概述米带的制备、表征及其光催化性质研究

35

354.2 实验部分35-364.2.1 前驱体溶胶的制备4.2.2 静电纺丝技术制备PVP/[La(NO_3)_3+Fe(NO_3)_3]

4.2.3 LaFeO_3纳米带的制备

4.3 结果与讨论

4.3.2 XRD分析

4.3.4 EDS分析

4.3.6 LaFeO_3纳米带的

第五章

5.1 复合纳米带35-363636-4237-3839-404.2.4 光催化活性评价364.3.1 TG-DTA分析36-374.3.3 SEM分析38-394.3.5 FTIR分析40-41光催化活性分析41-424.4 本章小结42-44La_(1-x)Ca_xMnO_3(x=0,0.2)纳米带的制备和表征44-51

概述44

445.2 实验过程44-455.2.1 前驱体溶胶的制备5.2.3

5.3 结果5.2.2 静电纺丝技术 …… 此处隐藏：3775字，全部文档内容请下载后查看。喜欢就下载吧 ……