Novel chromium doped perovskites A(2)ZnTiO(6) (A= Pr, Gd): Synthesis, crystal structure and photocatalytic activity under simulated solar light irradiation

作者：Zhu, Hekai; Fang, Minghao^*; Huang, Zhaohui^*; Liu, Yan'gai; Chen, Kai; Guan, Ming; Tang, Chao; Zhang, Lina; Wang, Meng

来源：Applied Surface Science, 2017, 393: 348-356.

DOI：10.1016/j.apsusc.2016.10.038

• Double perovskite
• Chromium doping
• Photocatalyst
• Photocatalytic degradation

Double perovskite related oxides A(2)ZnTiO(6) (A= Pr, Gd) have been successfully synthesized by solid state reaction and investigated as photocatalysts for the first time. The two layered titanates mainly demonstrate absorbances under UV irradiation, except for several sharp absorption bands above 400 nm for Pr2ZnTiO6. Therefore, a series of photocatalysts by doping A(2)ZnTiO(6) (A= Pr, Gd) with Cr have been developed in the hope to improve their absorption in the visible light region. The successful incorporation of Cr was detected by XRD and XPS, and the prepared samples have also been characteriazed by SEM, UV-vis DRS and PL. The characterization results suggested that Cr was present mainly in the form of Cr3+, with only a small amount of Cr6+ species. It served as an efficient dopant for the extension of visible light absorbance and improved photocatalytic activities under solar light irradiation. For both Pr2ZnTiO6 and Gd2ZnTiO6, the valence band (VB) was composed of hybridized states of the Zn 3d, O 2p and the conduction band (CB) has major contribution from Zn 4s, Ti 3d orbitals. For Cr doped samples, the newly formed spin-polarized valence band in the middle of the band gap that primarily arises from Cr 3d orbitals was responsible for the improved optical and photocatalytic properties.

• 出版日期2017-1-30
• 单位北京有色金属研究总院; 中国地质大学（北京）