UV-Vis-NIR-light-driven Ag2O/Ag2S/CuBi2O4 double Z-scheme configuration for enhanced photocatalytic applications. (May 2021)

• Record Type: Journal Article
• Authors: Zhang, Zuowei; Hao, Hongshun; Yang, Hang; Zhu, Liangliang; Ding, Chao; Zhang, Gongliang; Bi, Jingran; Yan, Shuang; Liu, Guishan; Hou, Hongman
• Is Part Of: Materials science in semiconductor processing. Volume 126(2021)
• Publication Date: 2021-05
• Subjects: Ag2O/Ag2S/CuBi2O4 -- Double Z-scheme heterostructures -- Photocatalyst -- RhB degradation -- Cr(VI) reduction; Semiconductors -- Periodicals; Integrated circuits -- Materials -- Periodicals; Semiconducteurs -- Périodiques; Circuits intégrés -- Matériaux -- Périodiques; Electronic journals; 621.38152
• DOI: 10.1016/j.mssp.2021.105668
• Languages: English
• ISSNs: 1369-8001

Abstract

Abstract: The Ag2 O/Ag2 S/CuBi2 O4 double Z-scheme heterostructures photocatalysts with different Ag2 O proportion were successfully synthesized via the hydrothermal and coprecipitation methods. Compared with those of pure CuBi2 O4 and Ag2 S, the absorption of near-infrared light of Ag2 O/Ag2 S/CuBi2 O4 samples is enhanced, their photocurrent intensity is significantly increased, and the charge transfer resistance is reduced. Obviously, all the Ag2 O/Ag2 S/CuBi2 O4 samples exhibited significantly enhanced photoactivities under the UV, Vis or NIR light irradiation. Of them, under the simulated sunlight, Ag2 O/Ag2 S/CuBi2 O4 with 36.7 wt% Ag2 O showed the highest catalytic activity with RhB degradation rate of 99.2% and the reduction rate of Cr(VI) of 53%. The construction of double Z-scheme heterojunction reduced the recombination of electrons and holes and improved the separation efficiency of electron. Moreover, Ag2 S and Ag2 O broadened the photoresponse range to a wide spectrum, and then improved the photocatalytic efficiency. In addition, the stability of Ag2 O/Ag2 S/CuBi2 O4 containing 36.7 wt% Ag2 O was demonstrated through three successive cycling experiment. Graphical abstract: Image 1 Highlights: A new Ag2 O/Ag2 S/CuBi2 O4 double Z-scheme heterostructures were synthesized. RhB degradation and Cr (IV) reduction under UV, Vis or NIR light was investigated. Ag2 O/Ag2 S/CuBi2 O4 contained Ag2 O of 36.7 wt% exhibits the highest photoactivities. The improved photocatalytic activity could be attributed to double Z-scheme heterojunction. This study provides a great way to obtain stable heterostructure photocatalyst.