摘要
采用聚丙烯酰胺凝胶法制备了锰酸钇(YMnO3)纳米颗粒,并运用X射线衍射、扫描电镜和紫外可见漫反射光谱对样品进行了表征.结果表明,制得的YMnO3纳米晶主要为六方钙钛矿结构,兼有少许的正交钙钛矿结构,且颗粒粒度均匀、形貌规整、呈类球形,平均颗粒尺寸约为45nm.另外,测得YMnO3纳米颗粒的光学带隙值为1.31eV.以一种典型的偶氮染料甲基红为目标降解物,考察了YMnO3纳米颗粒的光催化活性.结果表明,在紫外光和可见光辐照下纳米颗粒均表现出了良好的光催化活性.
Yttrium manganite（YMnO3） nanoparticles were prepared by a polyacrylamide gel technique. X-ray diffraction analysis indicates that the as-synthesized YMnO3 nanocrystallites crystallize majorly into a hexagonal perovskite structure and minorly into an orthorhombic perovskite structure without the presence of any other impurities. Scanning electron microscope observation shows that the prepared YMnO3 nanoparticles are regularly spherical in shape and highly uniform in size with an average diameter of about 45 nm. Ultraviolet-visible diffuse reflectance spectroscopy was used to investigate the light-absorbing properties of YMnO3 nanoparticles,and the value of the optical bandgap energy is obtained to be 1.31 eV. The photocatalytic activity of YMnO3 nanoparticles was investigated by the degradation of methyl red. The experimental results reveal that the nano-YMnO3 exhibits a pronounced photocatalytic activity for methyl red decomposition under ultraviolet and visible light irradiation.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第7期1199-1203,共5页
基金
国家自然科学基金(50962009)
教育部科学技术研究重点项目(209130)
甘肃省自然科学基金(1010RJZA041)
兰州理工大学优秀青年基金(Q200902)~~
关键词
聚丙烯酰胺凝胶法
锰酸钇
纳米颗粒
甲基红
光催化活性
polyacrylamide gel technique
yttrium manganite
nanoparticles
methyl red
photocatalytic activity
