Z-scheme transfer pathway assisted photoelectrocatalyst Zn2SnO4/rGO/Ag/AgBr for organic pollutants treatment

Rational design of photoelectrode with high visible light utilization rate and separation efficiency of electron-hole pairs is the key step in photoelectrocatalytic technology. In this work, Z-Scheme photoelectrocatalyst (ZTO/rGO/Ag/AgBr) was synthesized by hydrothermal and photo-reduction process....

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2023-01, Vol.657, p.130552, Article 130552
Main Authors: Peng, Xiangyu, Tian, Jiayi, Zhang, Shuai, Xiao, Wei, Tian, Xiaozhen, Wang, Yubin, Xue, Juanqin, Lei, Dashi
Format: Article
Language:English
Subjects:
Organic pollutants
Photoelectrocatalytic
Z-Scheme heterojunction
Zn2SnO4/rGO/Ag/AgBr
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Summary:Rational design of photoelectrode with high visible light utilization rate and separation efficiency of electron-hole pairs is the key step in photoelectrocatalytic technology. In this work, Z-Scheme photoelectrocatalyst (ZTO/rGO/Ag/AgBr) was synthesized by hydrothermal and photo-reduction process. Comparing with pure Zn2SnO4 (ZTO), adding reduced graphene oxide (rGO) effectively improved electrons transfer efficiency. Notably, the addition of Ag/AgBr not only broaden the visible light response range of ZTO, but also accelerated the separation of photo-generated electron-hole pairs, and constructed all-solid-state Z-Scheme heterojunction. Meanwhile, DFT calculation showed that Ag metal on rGO surface could act as active site for organic dyes degradation. Moreover, the addition of extra bias potential during photoelectrochemical process not only accelerate the migration of carriers, but also inhibit the recombination of photo-generated electron-hole pairs. Methylene blue (MB) could be effectively removed during photoelectrochemical reaction process, which was attributed to hydroxyl radical (•OH) and superoxide radical (•O2-). In this work, Z-Scheme transfer pathway, assisted photoelectrocatalytic technology, is a feasible strategy for improving catalytic performance. [Display omitted] •All-solid-state Z-Scheme heterjunction was confirmed by in-situ XPS and DFT calculation.•Z-Scheme transfer pathway assisted electrocatalysis accelerated carrier separation.•Adding rGO effectively improved the electrical conductivity of photo-anode.•Ag metal on rGO surface could act as active site for anionic group.
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2022.130552