Hydrothermal synthesis of ZnO quantum dot/KNb3O8 nanosheet photocatalysts for reducing carbon dioxide to methanol
| Autor: | Weiyue Xin, Xiao Shao, Xiaohong Yin |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Absorption spectroscopy Scanning electron microscope General Physics and Astronomy 02 engineering and technology lcsh:Chemical technology 010402 general chemistry Photochemistry lcsh:Technology 01 natural sciences chemistry.chemical_compound Hydrothermal synthesis lcsh:TP1-1185 General Materials Science Electrical and Electronic Engineering lcsh:Science High-resolution transmission electron microscopy Nanosheet methanol production lcsh:T ZnO quantum dots 021001 nanoscience & nanotechnology KNb3O8 nanosheets lcsh:QC1-999 0104 chemical sciences Chemical engineering chemistry CO2 reduction Quantum dot Photocatalysis lcsh:Q Methanol 0210 nano-technology photocatalysis lcsh:Physics |
| Zdroj: | Beilstein Journal of Nanotechnology, Vol 8, Iss 1, Pp 2264-2270 (2017) |
| ISSN: | 2190-4286 |
| DOI: | 10.3762/bjnano.8.226 |
| Popis: | ZnO quantum dots and KNb3O8 nanosheets were synthesized by a two-step hydrothermal method for the photocatalytic reduction of CO2 to methanol where isopropanol is simultaneously oxidized to acetone . The as-prepared photocatalysts were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM) and UV–vis absorption spectroscopy (UV–vis). The photocatalytic activity of the materials was evaluated by formation rate of methanol under UV light irradiation at ambient temperature and pressure. The methanol formation rate of pure KNb3O8 nanosheets was found to be 1257.21 μmol/g/h, and after deposition of 2 wt % ZnO quantum dots on the surface of KNb3O8 nanosheets, the methanol production rate was found to increase to 1539.77 μmol/g/h. Thus, the ZnO quantum dots obviously prompted separation of charge carriers, which was explained by a proposed mechanism for this photocatalytic reaction. |
| Databáze: | OpenAIRE |
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