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Título: | The surface chemistry of graphene oxide: Enhancing the performance of ZnO to GO photocatalysts |
Autor: | Víctor-Román, Sandra CSIC ORCID; García-Bordejé, José Enrique CSIC ORCID ; González Domínguez, José Miguel CSIC ORCID ; Ansón Casaos, Alejandro CSIC ORCID ; Silva, Adrián M. T.; Maser, Wolfgang K. CSIC ORCID ; Benito, Ana M. CSIC ORCID | Palabras clave: | Graphene oxide ZnO-GO hybrid Surface chemistry Zinc oxide Photocatalysis |
Fecha de publicación: | 9-dic-2019 | Citación: | HeteroNanoCarb-2019 (2019) | Resumen: | We demonstrate that the surface chemistry of graphene oxide Graphene oxide (GO) is of critical importance for the photocatalytic performance of semiconducting metal oxides such as TiO2 or ZnO. To this end we employ GO with distinct and well-defined oxidation degree for the preparation of ZnO-GO hybrid materials. We show that the surface chemistry of GO is key for facilitating favorable interface interactions. This results in a lowering of the alignment of energy levels at the ZnO-GO interface and enables the transfer of photo-excited electrons from ZnO to GO. The remaining positive charge at the valence band of ZnO then easily can promote oxidation reactions with the analyte and/or the solvent. In this way, GO reduces the recombination rate of the photogenerated electron-hole pair and enhances the photocatalytic activity of ZnO. We show that by solely controlling the oxidation degree of GO and by optimizing the loading fraction highly efficient ZnO-GO photocatalysts can be prepared. Most favorable conditions are achieved for intermediate oxidation degrees of GO. Optimized ZnO-GO hybrids thus reveal photocatalytic degradation of methylene blue at conversion rates of up to 80%, within times as short as 70 minutes at concentrations as low as 0.045 mg/mL, accompanied by a good recyclability behavior. The results are of general character and extendable to semiconducting metal oxides used in photocatalysis [1]. | Descripción: | Abstract of the poster presented at the HeteroNanoCarb-2019 Conference, Advances and applications in carbon related nanomaterials: From pure to doped structures including heteroatom layers, 2019, December 09th -- 13th, Centro de Ciencias de Benasque Pedro Pascual, in Benasque (Aragon, Spain). | URI: | http://hdl.handle.net/10261/256723 |
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