Journal
NANOSCALE RESEARCH LETTERS
Volume 13, Issue -, Pages -Publisher
SPRINGEROPEN
DOI: 10.1186/s11671-018-2778-9
Keywords
Z-scheme; Photocatalytic; BiOBr0.3I0.7/Ag/AgI
Funding
- National Natural Science Foundation of China Program [51602111]
- Cultivation Project of the National Engineering Technology Center [2017B090903008]
- Xijiang RD Team
- Science and Technology Application in Guangdong [2017B020240002]
- Guangdong Provincial Grant [2015A030310196, 2017A050506009]
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A series of novel visible light driven all-solid-state Z-scheme BiOBr0.3I0.7/Ag/AgI photocatalysts were synthesized by facile in situ precipitation and photo-reduction methods. Under visible light irradiation, the BiOBr0.3I0.7/Ag/AgI samples exhibited enhanced photocatalytic activity compared to BiOBr0.3I0.7 and AgI in the degradation of methyl orange (MO). The optimal ratio of added elemental Ag was 15%, which degraded 89% of MO within 20 min. The enhanced photocatalytic activity of BiOBr0.3I0.7/Ag/AgI can be ascribed to the efficient separation of photo-generated electron-hole pairs through a Z-scheme charge-carrier migration pathway, in which Ag nanoparticles act as electron mediators. The mechanism study indicated that center dot O-2(-) and h(+) are active radicals for photocatalytic degradation and that a small amount of center dot OH also participates in the photocatalytic degradation process.
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