We prepared graphene (GNP)-TiO2 nanoparticle (NP) hybrids using COOH and NH2 functionalized GNP as shape controller. Anatase was the only TiO2 crystalline phase nucleated on the functionalized GNP, whereas traces of rutile were detected on unfunctionalized GNP. X-Ray Photoelectron spectroscopy (XPS) showed C-Ti bonds on all hybrids, thus confirming heterogeneous nucleation. GNP functionalization induced the nucleation of TiO2 NPs with specific shape and crystalline facets exposed. COOH functionalization directed the synthesis of anatase truncated bipyramids, bonded to graphene sheets via the {101} facets, while NH2 functionalization induced the formation of belted truncated bipyramids, bonded to graphene via the {100} facets. Belted truncated bipyramids formed on unfuctionalized GNP too, however the NPs were more irregular and rounded. These effects were ascribed to pH variations in the proximity of the functionalized GNP sheets, due to the high density of COOH or NH2groups. Phenol was used as a target molecule for evaluating the photocatalytic activity of the synthetized materials. Because of the different reactivity of anatase {100} and {101} crystalline facets, te hybrid materials behave differently as photocatalysts, and the COOH-GNP-TiO2 hybrids are the best photocatalysts for pollutant abatment.

Use of graphene-TiO<sub>2</sub> hybrid materials for pollutant abatement

248th National Meeting (2014)

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Use of graphene-TiO2 hybrid materials for pollutant abatement

Use of graphene-TiO₂ hybrid materials for pollutant abatement