不同形貌氢氧化镧纳米晶的光催化性能  

Photocatalytic Properties of La(OH)_3 Nanoparticles with Different Morphologies

作　　者：符馨元[1] 黄剑锋[1] 曹丽云[1] 李嘉胤[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,西安710021

出　　处：《硅酸盐学报》2013年第8期1158-1162,共5页Journal of The Chinese Ceramic Society

基　　金：陕西省自然科学基金(2010JM6001);陕西省教育厅专项项目(2010JK444);陕西省国际科技合作重点项目(2011KW-11);陕西科技大学研究生创新基金资助项目

摘　　要：以La(NO3)3.6H2O为镧源,采用微波水热法制备了不同形貌(例如:不规则粒状、片状、棒状)La(OH)3纳米晶。采用X射线衍射、场发射扫描电子显微镜、紫外–可见光谱等技术对所制得的产物的物相组成、形貌和光学性能进行分析。结果表明:随着前驱体浓度的增大,La(OH)3纳米晶由不规则粒状向片状转变,再由片状向棒状转变。紫外–可见光谱分析和光催化结果表明,La(OH)3纳米晶在200～400nm具有优异的吸收能力。La(OH)3纳米棒对紫外区域吸收率最大,不规则形状的La(OH)3对紫外区域吸收率最小。La(OH)3纳米棒优于其他形貌对亚甲基蓝的光催化降解,降解率可达到93%,而纳米片和不规则粒状的光催化降解率分别为87%和75%。La（OH）3 nanoparticles with various morphologics （i.e., irregular, sheet and rod） were synthesized using La（NO3）3·6H2O as raw materials by a microwave hydrothermal method. The phase composition, morphology and optical properties of as-prepared samples were characterized by X-ray diffraction, field emission scanning electron microscopy and ultraviolet–visible spectroscopy （UV–Vis）, respectively. Results show that the morphology of the nanoparticle changes from irregular shapes to sheets, and then to rods when the solution concentration increases. According to the UV–Vis and photocatalytic measurements, La（OH）3 has a high absorption in 200–400nm. La（OH）3 nanorods has a highest absorption while the irregular nanoparticles has a lowest absorption. The degradation rate of La（OH）3 nanorods is 93%, showing a superior effect on the photocatalytic propertie to methyl blue. The degradation rates of La（OH）3 nanosheets and irregular nanoparticles obtained under the same conditions are 87% and 75%, respectively.

关 键 词：微波水热法 氢氧化镧 纳米晶 光催化 

分 类 号：TQ133.3[化学工程—无机化工]