黑钙锰矿氧化物CaMn2O4纳米颗粒的光谱学表征及其光催化应用研究
首发时间:2016-05-13
摘要:采用紫外-可见光吸收光谱研究黑钙锰矿氧化物CaMn2O4的光学特性,发现CaMn2O4的四个光学吸收带:638 nm(1.94 eV)、512 nm(2.42 eV)、377 nm(3.29 eV)和248 nm(5.0 eV),分别对应于1.84 eV(O2p↑→eg1↑)、2.56 eV(O2p↓→eg1↑)、3.36 eV(eg1↑→t2g3↓)和5.20 eV(O2p↑→ t2g3↓)的光诱导电荷转移跃迁,与理论计算结果相一致,其中反铁磁体CaMn2O4的超交换相互作用和Jahn-Teller效应起重要作用。进一步,光催化实验表明在紫外-可见光辐照下,CaMn2O4可作为光催化剂降解偶氮染料酸性橙Ⅱ(azo-dye acid orange 7,AO7)。
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Optical characterization and photocatalysis study of marokite-type CaMn2O4 nanoparticles
Abstract:In this paper, the optical properties of marokite-type CaMn2O4 are investigated by UV-Vis spectroscopy. 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 (CT) transitions O2p↑→Mn3d eg↑, O2p↓→Mn3d eg↑, Mn3d eg↑→Mn3d t2g↓ and O2p↑→Mn3d t2g↓, respectively, consistent with the LSDA+U results. Furthermore, we found that CaMn2O4 as a photocatalyst can decompose an azo-dye acid orange 7 (AO7) under irradiation of UV-Visible light.
Keywords: Optical absorption CaMn2O4 Charge transfer transition photocatalysis
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