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Issue 4, 2018
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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

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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-C3N4 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-C3N4 and AgI/BiOI, the as-synthesized composite of AgI/BiOI/g-C3N4 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.

Graphical abstract: 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

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Supplementary files

Article information


Submitted
26 Oct 2017
Accepted
18 Jan 2018
First published
22 Jan 2018

Catal. Sci. Technol., 2018,8, 1161-1175
Article type
Paper

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

C. Liang, C. Niu, H. Guo, D. Huang, X. Wen, S. Yang and G. Zeng, Catal. Sci. Technol., 2018, 8, 1161
DOI: 10.1039/C7CY02190A

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