BiOI-SnO2 Heterojunction Design to Boost Visible-Light-Driven Photocatalytic NO Purification.
Int J Environ Res Public Health
; 20(5)2023 02 23.
Article
em En
| MEDLINE
| ID: mdl-36901018
ABSTRACT
The efficient, stable, and selective photocatalytic conversion of nitric oxide (NO) into harmless products such as nitrate (NO3-) is greatly desired but remains an enormous challenge. In this work, a series of BiOI/SnO2 heterojunctions (denoted as X%B-S, where X% is the mass portion of BiOI compared with the mass of SnO2) were synthesized for the efficient transformation of NO into harmless NO3-. The best performance was achieved by the 30%B-S catalyst, whose NO removal efficiency was 96.3% and 47.2% higher than that of 15%B-S and 75%B-S, respectively. Moreover, 30%B-S also exhibited good stability and recyclability. This enhanced performance was mainly caused by the heterojunction structure, which facilitated charge transport and electron-hole separation. Under visible light irradiation, the electrons gathered in SnO2 transformed O2 to ·O2- and ·OH, while the holes generated in BiOI oxidized H2O to produce ·OH. The abundantly generated ·OH, ·O2-, and 1O2 species effectively converted NO to NO- and NO2-, thus promoting the oxidation of NO to NO3-. Overall, the heterojunction formation between p-type BiOI and n-type SnO2 significantly reduced the recombination of photo-induced electron-hole pairs and promoted the photocatalytic activity. This work reveals the critical role of heterojunctions during photocatalytic degradation and provides some insight into NO removal.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Elétrons
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Óxido Nítrico
Tipo de estudo:
Health_economic_evaluation
Idioma:
En
Revista:
Int J Environ Res Public Health
Ano de publicação:
2023
Tipo de documento:
Article
País de afiliação:
China