A redox-active support for the synthesis of Au@SnO core-shell nanostructure and SnO quantum dots with efficient photoactivities

• Published in: RSC advances 2020-09, Vol.1 (56), p.33955-33961
• Main Authors: Pan, Xiaoyang, Chen, Wen-Jie, Cai, Huizhen, Li, Hui, Sun, Xue jiao, Weng, Bo, Yi, Zhiguo
• Format: Article
• Language: English
• ISSN: 2046-2069
• DOI: 10.1039/d0ra06175a

A defect pyrochlore-type Sn 1.06 Nb 2 O 5.59 F 0.97 (SnNbOF) nano-octahedron is used as a redox-active support for fabricating Au@SnO 2 core-shell and SnO 2 quantum dots at room temperature without the use of organic species or foreign reducing reagents. Gold (Au) and SnO 2 components were obtained through an in situ redox reaction between the HAuCl 4 and reductive Sn 2+ ions incorporated in SnNbOF. The composition and morphology of the resulting nanocomposites (denoted as Au-SnNbOF) could be controlled by adjusting the Au/SnNbOF ratio. The Au-SnNbOF nanocomposites exhibited efficient photoactivities for methyl orange (MO) degradation under the visible light irradiation ( λ > 420 nm), during which the MO was almost completely degraded within 8 min. Among all the samples, the 5wt% Au-SnNbOF nanocomposite had the highest rate constant (0.43 min −1 ), which was 40 times higher than that of the blank SnNbOF. A defect pyrochlore-type Sn 1.06 Nb 2 O 5.59 F 0.97 nano-octahedron is used as a redox-active support for the fabrication of Au@SnO 2 core-shell structure and SnO 2 quantum dots.