Constructing Z-scheme SnO₂/N-doped carbon quantum dots/ZnSn(OH)₆ nanohybrids with high redox ability for NOx removal under VIS-NIR light

Yanfeng LU, Yu HUANG, Jun-ji CAO, Haiwei LI, Wing Kei HO, Shun Cheng LEE

Research output: Contribution to journalArticle

Abstract

Photocatalysts with a wide optical response range and high oxidation ability are essential for their application in air pollution control. In this study, mesoporous SnO₂/NCDs/ZnSn(OH)₆ (NCDs = N-doped carbon quantum dots) Z-scheme nanohybrids were synthesized for the first time using an in situ strategy. The ternary Z-scheme catalysts showed significantly enhanced visible and near-infrared light-driven photocatalytic activities for nitric oxide (NO) removal (37%), while the toxic nitrogen dioxide (NO₂) intermediate was suppressed completely. The Z-schematic transfer mechanism was confirmed through characterizing the intrinsic properties of the as-prepared sample. The NCDs, as an electron transport bridge, improve both the broad-spectrum light-harvesting ability and the rapid separation of photoinduced electrons. Compared with the binary counterparts, the SnO₂/NCDs/ZnSn(OH)₆ ternary nanohybrid can generate more reactive oxygen-containing radicals during the photocatalytic reaction, owing to its ability to supply sufficient free surface OH. This study provides insights into the heterogeneous photocatalytic Z-scheme reaction mechanism. Copyright © 2019 The Royal Society of Chemistry.
Original languageEnglish
Pages (from-to)15782-15793
JournalJournal of Materials Chemistry A
Volume7
Issue number26
Early online date04 Jun 2019
DOIs
Publication statusPublished - 14 Jul 2019

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Semiconductor quantum dots
Carbon
Nitrogen Dioxide
Air pollution control
Poisons
Nitric oxide
Schematic diagrams
Photocatalysts
Nitric Oxide
Oxygen
Nitrogen
Infrared radiation
Oxidation
Catalysts
Electrons
Oxidation-Reduction
Electron Transport

Bibliographical note

Lu, Y., Huang, Y., Cao, J.-J., Li, H., Ho, W., & Lee, S. C. (2019). Constructing Z-scheme SnO₂/N-doped carbon quantum dots/ZnSn(OH)₆ nanohybrids with high redox ability for NOx removal under VIS-NIR light. Journal of Materials Chemistry A, 7(26), 15782-15793. doi: 10.1039/C9TA03504D