催化学报 ›› 2011, Vol. 32 ›› Issue (7): 1199-1203.DOI: 10.3724/SP.J.1088.2011.10151

• 研究论文 • 上一篇    下一篇

新型半导体可见光催化剂纳米锰酸钇

王仕发1,2, 杨华1,2,*, 县涛1,2   

  1. 1兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室, 甘肃兰州 730050; 2兰州理工大学理学院, 甘肃兰州 730050
  • 收稿日期:2011-01-28 修回日期:2011-03-14 出版日期:2011-07-18 发布日期:2014-11-28

A Novel Visible-Light-Driven Semiconductor Photocatalyst: Nano-Yttrium Manganite

WANG Shifa, YANG Hua*, XIAN Tao   

  1. 1State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, Gansu, China; 2School of Science, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
  • Received:2011-01-28 Revised:2011-03-14 Online:2011-07-18 Published:2014-11-28

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 45 nm. 另外, 测得 YMnO3 纳米颗粒的光学带隙值为 1.31 eV. 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.

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

Abstract: 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.

Key words: polyacrylamide gel technique, yttrium manganite, nanoparticles, methyl red, photocatalytic activity