Abstract
Graphite-oxide/TiO2 (GO/TiO2) composite materials were prepared by heterocoagulation method from Brodie’s graphite-oxide (GO) in order to test them as catalysts in the methanol photocatalytic reforming reaction in liquid phase. The preparation of the composite itself resulted in only little changes in the structure of GO as it was indicated by attenuated total reflection infrared (ATR-IR) and 13C magic-angle spinning nuclear magnetic resonance (13C MAS NMR) spectroscopic measurements. However, during the photocatalytic reaction, all of the GO/TiO2 samples darkened strongly indicating structural changes of GO. X-ray photoelectron spectroscopy along with NMR confirmed the loss of oxygen functionalities and emergence of graphitic species in the samples recovered from the photocatalytic reaction. Model experiments were designed to identify the key factors determining the activity of the GO/TiO2 derived photocatalysts. It was found that the emergence of a pronounced coupling between TiO2 and the graphite-like carbonaceous material is the most important contribution to get active and stable photocatalysts.
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Acknowledgements
The research within project No VEKOP-2.3.2-16-2017-00013 was supported by the European Union and the State of Hungary, co-financed by the European Regional Development Fund. Financial support by the National Research, Development and Innovation Office (Hungary) via the grant FK-124851 is greatly acknowledged. The authors thank Ágnes Veres for her aid in sample preparation, Gábor P. Szijjártó for the help in the operation of the photocatalytic reactor system and Ildikó Turi for the technical assistance.
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Majrik, K., Turcsányi, Á., Pászti, Z. et al. Graphite Oxide-TiO2 Nanocomposite Type Photocatalyst for Methanol Photocatalytic Reforming Reaction. Top Catal 61, 1323–1334 (2018). https://doi.org/10.1007/s11244-018-0989-z
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DOI: https://doi.org/10.1007/s11244-018-0989-z