Direct growth of shape controlled TiO2 nanocrystals onto SWCNTs for highly active photocatalytic materials in the visible

Petronella, Francesca; Curri, Maria Lucia; Striccoli, Marinella; Fanizza, Elisabetta; Mateo-Mateo, Cintia; Alvarez-Puebla, Ramón A.; Sibillano, Teresa; Giannini, Cinzia; Correa‐Duarte, Miguel A.; Comparelli, Roberto

doi:10.1016/j.apcatb.2014.10.030

Cited by 27 publications

(17 citation statements)

References 54 publications

(80 reference statements)

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“…Indeed, only SWCNTs/TiO 2 NRs have demonstrated improved photocatalytic activity under visible light. The authors explained that this results from invoking a doping-like effect, induced by the Ti-O-C bonds that are supposed to be more abundant in the case of SWCNTs/TiO 2 NRs, due to the higher contact between SWCNT and TiO 2 nanocrystals [17].…”

Section: Cnts-tio 2 -Based Heterostructuresmentioning

confidence: 99%

“…Indeed, the capability to tune size and shape allows us to increase the surface-to-volume ratio (i.e., the density of catalytically active surface sites) and to tailor the redox potential e − /h + pairs and expose selected crystalline planes [17]. In general, the strategies proposed to increase the lifetime of e − /h + and improve the photoactivity of TiO 2 in the visible range can be classified as follows: (i) introduction of red-ox couples or noble metals at semiconductor particle surface; (ii) doping with metal of non-metal atoms; (iii) coupling with narrow band gap semiconductors able to absorb visible light.…”

Section: Introductionmentioning

confidence: 99%

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Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

et al. 2017

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Photocatalytic nanomaterials such as TiO 2 are receiving a great deal of attention owing to their potential applications in environmental remediation. Nonetheless, the low efficiency of this class of materials in the visible range has, so far, hampered their large-scale application. The increasing demand for highly efficient, visible-light-active photocatalysts can be addressed by hybrid nanostructured materials in which two or more units, each characterised by peculiar physical properties, surface chemistry and morphology, are combined together into a single nano-object with unprecedented chemical-physical properties. The present review intends to focus on hybrid nanomaterials, based on TiO 2 nanoparticles able to perform visible-light-driven photocatalytic processes for environmental applications. We give a brief overview of the synthetic approaches recently proposed in the literature to synthesise hybrid nanocrystals and discuss the potential applications of such nanostructures in water remediation, abatement of atmospheric pollutants (including NO x and volatile organic compounds (VOCs)) and their use in self-cleaning surfaces.

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Section: Cnts-tio 2 -Based Heterostructuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

et al. 2017

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“…They have applications in Ti-implants to avoid post-operation infections [11][12][13]. The discoloration of the textile dye methyl red under UVlight and the degradation of pollutants by Ag-TiO 2 nanotubes has been recently reported [14,15]. Ag-TiO 2 was observed to accelerate bacterial inactivation when compared with bare TiO 2 under band-gap irradiation [16,17].…”

Section: Introductionmentioning

confidence: 99%

FeOx magnetization enhancing E. coli inactivation by orders of magnitude on Ag-TiO2 nanotubes under sunlight

Mangayayam

Kiwi

Giannakis

et al. 2017

Applied Catalysis B: Environmental

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a b s t r a c tDrastic bacterial enhancement was observed when the Ag(3%)-TiO 2 nanotubes were modified with FeOx (3%) magnetic oxide. On bare TiO 2 -nanotubes a reduction of 0.2log 10 CFU was observed within one hour under simulated low intensity solar light. Under similar conditions, a bacterial reduction of 2.5log 10 CFU was observed on Ag(3%)TiO 2 increasing to 6.0log 10 CFU on Ag(3%)-TiO 2 -FeOx(3%) magnetic nanotubes. The bacterial inactivation kinetics is strongly influenced by the addition of FeOx. The fast inactivation induced by the composite catalyst seems to involve an increase in the interfacial charge transfer (IFCT) compared to a 2-oxide composite photocatalyst. Stable recycling of the photocatalyst was observed leading to bacterial oxidation. The unambiguous identification of the radical intermediates: OH-radicals, O-singlet and the valence holes vb(h + ) on the Ag-TiO 2 -FeOx interface showed that the valence band holes vb(h + ) were the main oxidative intermediates leading to bacterial inactivation. Nanotubes size, crystallinity and bulk composition of magnetite 1% ( = 51.0• ), anatase 5% ( = 8.9• ), goethite 37.3% ( = 9.0 • ), silver 1% ( = 2.7• ) was obtained by the Rietveld refinement for the Ag(3%)-TiO 2 -FeOx(3%) nanotubes. The redox chemistry during bacterial inactivation was determined by X-ray photoelectron spectroscopy (XPS).

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“…Typical questions concerning the materials are: -crystalline structure -crystalline domain size -multiple crystalline phases -possible preferred orientations Several X-ray powder diffraction profiles, measured from nanocrystals with different lattice symmetries, are here provided: cubic copper [57] (Figure 6a), monoclinic tenorite [58] (Figure 6b), tetragonal anatase [59] (Figure 6c) and rutile [60] (Figure 6d), hexagonal hydroxyapatite [61] (Figure 7a). Table 1 summarizes the data derived from the analysis of the profiles: cell dimensions, domain size along two orthogonal directions.…”

Section: Nanocrystalline Powdersmentioning

confidence: 99%

X-ray Diffraction: A Powerful Technique for the Multiple-Length-Scale Structural Analysis of Nanomaterials

et al. 2016

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During recent decades innovative nanomaterials have been extensively studied, aiming at both investigating the structure-property relationship and discovering new properties, in order to achieve relevant improvements in current state-of-the art materials. Lately, controlled growth and/or assembly of nanostructures into hierarchical and complex architectures have played a key role in engineering novel functionalized materials. Since the structural characterization of such materials is a fundamental step, here we discuss X-ray scattering/diffraction techniques to analyze inorganic nanomaterials under different conditions: dispersed in solutions, dried in powders, embedded in matrix, and deposited onto surfaces or underneath them.

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Direct growth of shape controlled TiO2 nanocrystals onto SWCNTs for highly active photocatalytic materials in the visible

Cited by 27 publications

References 54 publications

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

FeOx magnetization enhancing E. coli inactivation by orders of magnitude on Ag-TiO2 nanotubes under sunlight

X-ray Diffraction: A Powerful Technique for the Multiple-Length-Scale Structural Analysis of Nanomaterials

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