Graphene production is an ongoing challenge for large-scale applications. Many processes are used to produce graphene 1. Top-down method such as the exfoliation of graphite powder in liquid phase by sonication is a promising route to create high quality graphene in great quantity due to its simplicity, its versatility and its low-cost 2. Graphene with the thickness of a single carbon atom owns unique physical and chemical properties like large surface area, highly flexible structure, high electrical and thermal conductivity and high chemical stability 3. With these properties, graphene is an attractive material in applications that require a fast electron transfer, such as photocatalysis. In fact, graphene based semiconductor nanocomposites are considered as good photocatalyst for pollutant degradation 4. Graphene is an ideal nanomaterial for doping TiO2 because the formation of Ti-O-C bonds extend the visible light absorption of TiO2. Furthermore, electrons are easily transported from TiO2 to graphene nano-sheets and the electron-hole recombination is reduced; this is enhances the oxidative reactivity 5. In this work, graphene doped TiO2 nanocomposite was used as photocatalytic materials for the Alizarin Red S degradation in water solutions. Graphene dispersions were prepared by liquid-phase exfoliation of graphite in the presence of a non-ionic surfactant, Triton X-100. The obtained graphene dispersion was characterized by X-Ray Diffraction, Dynamic Light Scattering and UV-Visible spectroscopy and was subsequently used for the preparation of graphene doped-TiO2 photocatalyst. Graphene doped-TiO2 nanocomposites showed higher adsorption of Alizarin Red S on the catalyst surface and higher photocatalytic activity for its degradation under visible light irradiation, respect to those obtained with pure TiO2 6. References: 1) Dimiev, A. M.; Tour, J. M. ACS Nano, 2014, 8, 3060 - 3068. 2) Samorì, P. et al. Chemical Society Reviews, 2014, 43, 381 - 398. 3) Geim, A.K.; Novoselov, K. S. Nature Materials, 2007, 6, 183 - 191. 4) Khalid, N. R.; Hong, Z. et al. Current Applied Physics, 2013, 13, 659 - 663. 5) Li, F.; Cheng, H. M. et al. Advanced Functional Materials, 2011, 21, 1717 - 1722. 6) Giovannetti, R.; D’ Amato, C. A. et al. Scientific Reports, 2015, 5, 17801.

From TiO2 and Graphite to Graphene doped TiO2 for visible light photocatalytic degradation of refractory dye.

ROMMOZZI, Elena;GIOVANNETTI, Rita;ZANNOTTI, MARCO;D'AMATO, CHIARA ANNA;FERRARO, Stefano;CESPI, MARCO;BONACUCINA, Giulia;MINICUCCI, Marco;DI CICCO, Andrea
2016

Abstract

Graphene production is an ongoing challenge for large-scale applications. Many processes are used to produce graphene 1. Top-down method such as the exfoliation of graphite powder in liquid phase by sonication is a promising route to create high quality graphene in great quantity due to its simplicity, its versatility and its low-cost 2. Graphene with the thickness of a single carbon atom owns unique physical and chemical properties like large surface area, highly flexible structure, high electrical and thermal conductivity and high chemical stability 3. With these properties, graphene is an attractive material in applications that require a fast electron transfer, such as photocatalysis. In fact, graphene based semiconductor nanocomposites are considered as good photocatalyst for pollutant degradation 4. Graphene is an ideal nanomaterial for doping TiO2 because the formation of Ti-O-C bonds extend the visible light absorption of TiO2. Furthermore, electrons are easily transported from TiO2 to graphene nano-sheets and the electron-hole recombination is reduced; this is enhances the oxidative reactivity 5. In this work, graphene doped TiO2 nanocomposite was used as photocatalytic materials for the Alizarin Red S degradation in water solutions. Graphene dispersions were prepared by liquid-phase exfoliation of graphite in the presence of a non-ionic surfactant, Triton X-100. The obtained graphene dispersion was characterized by X-Ray Diffraction, Dynamic Light Scattering and UV-Visible spectroscopy and was subsequently used for the preparation of graphene doped-TiO2 photocatalyst. Graphene doped-TiO2 nanocomposites showed higher adsorption of Alizarin Red S on the catalyst surface and higher photocatalytic activity for its degradation under visible light irradiation, respect to those obtained with pure TiO2 6. References: 1) Dimiev, A. M.; Tour, J. M. ACS Nano, 2014, 8, 3060 - 3068. 2) Samorì, P. et al. Chemical Society Reviews, 2014, 43, 381 - 398. 3) Geim, A.K.; Novoselov, K. S. Nature Materials, 2007, 6, 183 - 191. 4) Khalid, N. R.; Hong, Z. et al. Current Applied Physics, 2013, 13, 659 - 663. 5) Li, F.; Cheng, H. M. et al. Advanced Functional Materials, 2011, 21, 1717 - 1722. 6) Giovannetti, R.; D’ Amato, C. A. et al. Scientific Reports, 2015, 5, 17801.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11581/391701
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