Pulsed laser synthesis in liquid of efficient visible-light-active ZnO/rGO nanocomposites for improved photo-catalytic activity
| Autor: | Mohamed A. Dastageer, Mohammed A. Gondal, R.A. Moqbel, Talal F. Qahtan |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Polymers and Plastics Oxide chemistry.chemical_element 02 engineering and technology Zinc 010402 general chemistry 01 natural sciences law.invention Biomaterials chemistry.chemical_compound Adsorption law Rhodamine B chemistry.chemical_classification Nanocomposite Graphene Metals and Alloys Electron acceptor 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Chemical engineering 0210 nano-technology Visible spectrum |
| Zdroj: | Materials Research Express. 5:035050 |
| ISSN: | 2053-1591 |
| Popis: | In this work the synthesis of visible light active zinc oxide/reduced graphene oxide (ZnO/rGO) nanocomposite by laser induced fragmentation of particulates in liquid, its morphological/optical characterizations, and its application in the process of photo-catalytic degradation of toxic Rhodamine B (RhB) dye under visible radiation were studied. It is observed from the optical and morphological characterization that the anchoring of ZnO on the rGO sheets in ZnO/rGO nanocomposite considerably reduced the aggregation of ZnO (increased surface area), reduced the recombination of photo-induced charge carriers, promoted more adsorption of reactants on the catalytic surface and also enhanced and extended the light absorption in the visible spectral region. With all these improved characteristics of ZnO/rGO nanocomposite, it was found that this material as a photo-catalyst yielded an RhB degradation efficiency of 86%, as compared to the 40% degradation with pure ZnO NPs under the same experimental conditions. In the ZnO/rGO nanocomposite, rGO functions as an electron acceptor to promote charge separation, an aggregation inhibitor to enhance the active surface area, a co-catalyst, a good dye adsorber and also as a supporting matrix for ZnO. |
| Databáze: | OpenAIRE |
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