Combination of efficient charge separation with the assistance of novel dual Z-scheme system: self-assembly photocatalyst Ag@AgI/BiOI modified oxygen-doped carbon nitride nanosheet with enhanced photocatalytic performance. Issue 4 (2nd February 2018)

• Record Type: Journal Article
• Authors: Liang, Chao; Niu, Cheng-Gang; Guo, Hai; Huang, Da-Wei; Wen, Xiao-Ju; Yang, Shi-Feng; Zeng, Guang-Ming
• Is Part Of: Catalysis science & technology. Volume 8:Issue 4(2018)
• Page Start: 1161
• Page End: 1175
• Publication Date: 2018-02-02
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/c7cy02190a
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : The self-assembly dual Z-scheme photocatalyst Ag@AgI/BiOI/g-C3 N4 was successfully fabricated with high charge separation efficiency. Abstract : Natural or artificial Z-scheme systems have been applied for tackling environment pollution and energy crisis owing to the high reduction and oxidation ability driven by the unique interface charge-pairs transfer. However, a dual Z-scheme system combining direct Z-scheme and indirect Z-scheme is seldom adopted for photocatalysis. In this study, the self-assembly photocatalyst Ag@AgI/BiOI/g-C3 N4 was successfully fabricated based on the dual Z-scheme system combining direct and indirect Z-scheme systems. The synergistic effect of the dual Z-scheme system towards tetracycline (TC) degradation over the hybrid composites under visible light irradiation was investigated. Compared with single Z-scheme system composites of BiOI/g-C3 N4 and AgI/BiOI, the as-synthesized composite of AgI/BiOI/g-C3 N4 exhibited superior photocatalytic performance under identical conditions. The dual Z-scheme system was verified by active species generation (˙O2 −, ˙OH and h + ), trapping experiments and ESR analysis. Furthermore, the photostability and practical application were investigated based on a recycle experiment and controllable experiments. A possible dual Z-scheme mechanism for enhanced photocatalytic performance with ultra-fast charge-separation efficiency and high redox ability was proposed. This study will provide new insight to the design of novel heterojunction composites based on the dual Z-scheme system to deal with organic pollution and energy crisis.