静电纺丝技术制备LaCrO_4和LaCrO_3纳米带及其光催化性质  

Electrospinning Fabrication and Photocatalytic Properties of LaCrO_4 and LaCrO_3 Nanobelts

作　　者：孙霞[1] 董相廷[1] 王进贤[1] 刘桂霞[1] 

机构地区：[1]长春理工大学化学与环境工程学院,长春130022

出　　处：《高等学校化学学报》2011年第10期2262-2267,共6页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:50972020);吉林省科技发展计划重大项目(批准号:20070402;20060504);教育部科学技术研究重点项目(批准号:207026);长春市科技计划项目(批准号:2007045);吉林省教育厅"十一五"科学技术研究项目(批准号:2007-45;2005109)资助

摘　　要：采用溶胶-凝胶法结合静电纺丝技术制备了PVP/[La(NO3)3-Cr(NO3)3]复合纳米带,经热处理后得到LaCrO4纳米带和LaCrO3纳米带.采用TG-DTA,XRD,SEM和EDS等测试手段对样品进行了表征.结果表明,PVP/[La(NO3)3-Cr(NO3)3]复合纳米带表面光滑,宽度为(9.1±1.9)μm,厚度约385 nm;经600℃焙烧后得到单斜独居石型LaCrO4纳米带,宽度为(2.5±0.5)μm,厚度约100 nm;当焙烧温度为650～800℃时得到LaCrO3多孔纳米带,属正交晶系,Pbnm空间群,经650℃焙烧后得到的LaCrO3纳米带呈多孔结构,带宽为(2.4±0.5)μm,厚度约90 nm;经800℃焙烧后得到的LaCrO3纳米带部分破碎形成LaCrO3纳米粒子,LaCrO3纳米带宽度约(1.3±0.4)μm,厚度约90 nm,LaCrO3纳米粒子粒径约80 nm.以罗丹明B为目标降解物,研究了不同焙烧温度下产物的光催化性能,其中800℃焙烧后得到的样品在紫外光照射下对罗丹明B的降解效果最好,光照200 min后罗丹明B的降解率为94.6%.PVP/[La（NO3）3-Cr（NO3）3] composite nanobelts were fabricated via the combination of sol-gel method with electrospinning.LaCrO4 nanobelts and LaCrO3 nanobelts were obtained by calcination of the relevant composite nanobelts at different temperature for 8 h.The samples were characterized by thermogravimetric-differential thermal analysis（TG-DTA）,X-ray diffractometry（XRD）,scanning electron microscopy（SEM） and energy dispersive spectroscopy（EDS）.It was found that the surface of the composite nanobelts was smooth,and the width and thickness were（9.1±1.9） μm and 385 nm,respectively.Monoclinic monazite LaCrO4 nanobelts were prepared when the composite nanobelts were calcined at 600 ℃.The width of LaCrO4 nanobelts was（2.5±0.5） μm,and the thickness was ca.100 nm.Orthorhombic LaCrO3 porous nanobelts with space group Pbnm were formed by calcination of PVP/[La（NO3）3-Cr（NO3）3] composite nanobelts at 650—800 ℃.The width and thickness of LaCrO3 nanobelts obtained by calcination of composite nanobelts at 650 ℃ were（2.4±0.5） μm and 90 nm,respectively.Some of LaCrO3 nanobelts was broken into LaCrO3 nanoparticles at 800 ℃.The width of LaCrO3 nanobelts was（1.3±0.4） μm,and the thickness was about 90 nm,while the mean diameter of LaCrO3 nanoparticles was ca.80 nm.The photocatalytic activities of LaCrO4 nanobelts and LaCrO3 nanobelts were studied using rhodamine B as degradation agent.In the presence of LaCrO3 nanobelts obtained at 800 ℃,the best degradation result of rhodamine B was achieved by illumination of ultraviolet ray,and the degradation rate of rhodamine B reached 94.6% after the reactive mixture was illuminated for 200 min.

关 键 词：静电纺丝 LaCrO4 LaCrO3 纳米带 光催化 

分 类 号：O614.32[理学—无机化学] TB34[理学—化学]