Issue 26, 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

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
02 Apr 2019
Accepted
03 Jun 2019
First published
04 Jun 2019

J. Mater. Chem. A, 2019,7, 15782-15793

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

Y. Lu, Y. Huang, J. Cao, H. Li, W. Ho and S. C. Lee, J. Mater. Chem. A, 2019, 7, 15782 DOI: 10.1039/C9TA03504D

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