Optical Properties and Photocatalytic Activity of Marokite-Type CaMn2O4  

作　　者：WU Xue-Wei ZHANG Hai-Xin LIU Xiao-Jun ZHANG Xing-Gan 吴雪炜;张海新;刘晓峻;张兴敢(Key Laboratory of Modern Acoustics,Nanjing University,Nanjing 210093)

机构地区：[1]Key Laboratory of Modern Acoustics,Nanjing University,Nanjing 210093

出　　处：《Chinese Physics Letters》2011年第10期180-183,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos,10874087,11074124 and 11174113;Jiangsu Provincial Natural Science Foundation under Grant No.200921555.

摘　　要：The optical properties and electronic structure of marokite-type CaMn2O4 are investigated by using UV−vis spectroscopy and the local-spin-density approximation plus the Hubbard-U(LSDA+U)method.Four absorption bands are observed at 638 nm(1.94 eV),512 nm(2.42 eV),377 nm(3.29 eV)and 248 nm(5.00 eV),which are ascribed to the charge transfer transitions O2p↑→Mn3d eg↑,O2p↓→Mn3d eg↑,Mn3d eg↑→Mn3d t2g↓and O2p↑→Mn3d t2g↓,respectively.We further use CaMn2O4 as a photocatalyst to decompose an azo-dye acid orange 7(AO7)under irradiation of visible light and find that the decomposition ratio of AO7 reaches 15.9%under the irradiation of visible light for two hours.

关 键 词：MN2O4 VISIBLE ORANGE 

分 类 号：X70[环境科学与工程—环境工程]