Enhanced UV- and visible-light driven photocatalytic performances and recycling properties of graphene oxide/ZnO hybrid layers
| Autor: | Constantin Logofatu, Oana Pascu, A. Datcu, Ángel Pérez del Pino, Eniko Gyorgy, Raluca Ivan |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Oxide Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences Catalysis law.invention chemistry.chemical_compound law Materials Chemistry Irradiation Photodegradation Graphene Process Chemistry and Technology 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Chemical engineering chemistry Ceramics and Composites Photocatalysis Degradation (geology) 0210 nano-technology Visible spectrum |
| Zdroj: | Ceramics International. 44:1826-1835 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2017.10.117 |
| Popis: | Light induced catalytic processes have attracted significant attention during the last years for wastewater treatment due to their efficiency in decomposition of organic contaminants. In this study we report the synthesis of graphene oxide (GO)/ZnO hybrid layers with high photocatalytic efficiency using laser radiation. The results show that the hybrid layers exhibit much improved photodecomposition efficiency as compared to pure GO or ZnO both under UV and visible-light irradiation. The enhanced photocatalytic efficiency of the hybrid as compared to the reference pure ZnO and GO layers was attributed to the contribution of GO to the separation and transport of the photogenerated charge carriers. Additionally, under visible light irradiation the organic molecules can act as first sensitizers in the degradation process. The recyclability of the layers was also investigated through repetitive photodegradation cycles under UV- or visible-light irradiation. After consecutive degradation runs, the hybrid photocatalyst layers were still stable and retained high degradation efficiency, ensuring reusability. The photocatalytic activity of the layers was correlated with the gradual change of their chemical structure during consecutive degradation cycles. Owing to the high photodegradation efficiency, reusability, and ease of recovery the synthesised hybrid layers consisting of easily available materials are suitable for environmental purification applications. |
| Databáze: | OpenAIRE |
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