One step solid-state reaction synthesis, characterization, and catalytic performance of n–p SnO2/Bi2O3 composite

• Published in: Journal of materials science. Materials in electronics Vol. 29; no. 20; pp. 17463 - 17472
• Main Authors: Qiu, Taoyu, Liu, Shaoyou, Cai, Huidong, Zhou, Yan, Chen, Kao, Huang, Yan, Feng, Qingge
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.10.2018; Springer Nature B.V
• Subjects: Bismuth oxides; Bismuth trioxide; Catalysis; Characterization and Evaluation of Materials; Chemistry and Materials Science; Decoloring; Flakes; Light; Materials Science; Microscopy; Morphology; Nitrates; Optical and Electronic Materials; Organic chemistry; Photocatalysis; Reaction synthesis; Semiconductors; Solid state; Tin dioxide; X ray photoelectron spectroscopy
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-018-9846-x

A novel n–p SnO 2 /Bi 2 O 3 composite was synthesized by template free one step solid-state reaction synthesis. The as-prepared composite was characterized by XRD, HR-TEM, FE-SEM, UV–Vis, PL, and XPS. The photocatalytic capacity of n–p SnO 2 /Bi 2 O 3 was evaluated by monitoring the decolorization of Rh.B solution. The results indicate that: (1) The photocatalyst exhibited a unique flake-like powder structure. SnO 2 particles closely scattered on the surface of nano-flake structure of Bi 2 O 3 ; (2) Compared with pure SnO 2 and Bi 2 O 3 , all the composite samples extended the edge of absorbance to visible light region as long as 520 nm(sample S500) ; (3) The composite calcined at 500 ℃(sample S500) showed the highest separation capability of photo electrons and holes; (4) About 99% Rh.B can be completely decolorized within 30 min, and the reaction rate constant of S500 is about 10 times higher than that of pure SnO 2 and Bi 2 O 3 ; (5) The decolorization ratio was as high as 95% even in the 5th cycle which means the SnO 2 /Bi 2 O 3 composite is chemically stable; (6)Active species test showed that (·O 2 − ), holes (h + ) were the main active species during the decoloration of the Rh.B solution.