Nanocomposite materials for photocatalytic degradation of pollutants

Petronella, Francesca; Truppi, Alessandra; Ingrosso, Chiara; Placido, Tiziana; Striccoli, Marinella; Curri, Maria Lucia; Agostiano, Angela; Comparelli, Roberto

doi:10.1016/j.cattod.2016.05.048

Cited by 168 publications

(89 citation statements)

References 171 publications

(241 reference statements)

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“…Indeed, in spite of the great deal of attention devoted to photoactive nanomaterials in the last 20 years, their scarce efficacy under solar light and, thus, the high cost of the photocatalytic processes, has still hampered their large-scale application [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…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. Among the plethora of approaches proposed in the literature so far [1,2,[18][19][20], hybrid nanocrystals, i.e., nanostructured materials formed by two or more components, each characterised by peculiar physical properties, surface chemistry and morphology, combined together into one nano-object, hold great promise for the development of multifunctional nanocatalysts. Indeed, hybrid nanocrystals offer the opportunity to merge in one material photocatalytic semiconductors and plasmonic structures, or semiconductors and oxides with a different energy gap, or semiconducting and magnetic oxides, resulting in countless possible combinations [2,18,[20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…Semiconductor-assisted photocatalytic oxidation processes can be potentially exploited in photocatalysis, air and water remediation, self-cleaning and bactericidal coatings, new generation solar cells, hydrogen production, sensing and cultural heritage protection [2,[4][5][6][7][8][9][10][11]. TiO 2 has been regarded as among the most promising materials, owing to its high chemical stability, commercial availability and outstanding photocatalytic activity [3].…”

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…The TiO 2 NRs can be effectively processed and applied as component in composite materials or, like in this work, dispersed in a solvent to convey both self-cleaning and protective properties to an example of porous calcarenitic stones, namely the Pietra Leccese (PL), which is characteristic of the South of Italy. In the reported approaches, photoactive nanomaterials were mainly deposited on large surfaces as a composite coating, formed of a suitable host polymer incorporating the active nanomaterial [24]. Here, we exploited the unique processability of OLEA coated TiO 2 NRs, deriving from their peculiar surface chemistry, to disperse the nanoparticles in organic solvents.…”

Section: Introductionmentioning

confidence: 99%

Colloidal Nanocrystalline Semiconductor Materials as Photocatalysts for Environmental Protection of Architectural Stone

et al. 2017

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Rod-shaped TiO 2 nanocrystals (TiO 2 NRs), capped by oleic acid molecules (OLEA), were synthesized with controlled size, shape and surface chemistry by using colloidal routes. They were investigated for application as coating materials for preserving architectural stone of monumental and archaeological interest, in consideration of their self-cleaning and protection properties. For this purpose, two different deposition techniques, namely casting and dipping, were tested for the application of a nanocrystal dispersion on a defined stone type, as a relevant example of porous calcarenites, namely the Pietra Leccese, a building stone widely used in monuments and buildings of cultural and historic interest of the Apulia region (Italy). The physical properties of the stone surface were investigated before and after the treatment with the prepared nanostructured materials. In particular, colour, wettability, water transfer properties and stability of the coating were monitored as a function of time and of the application method. The self-cleaning properties of the TiO 2 NRs coated surfaces were tested under simulated and real solar irradiation. The obtained results were discussed in the light of the specific surface chemistry and morphology of TiO 2 NRs, demonstrating the effectiveness of TiO 2 NRs as an active component in formulations for stone protection.

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“…Their removal from water streams is therefore a major environmental concern, since azo dyes are harmful both to humans and to the aquatic life [1,7]. Being recalcitrant to natural degradation, several technologies have been developed for remediation of both streams and wastewaters, including photocatalytic degradation [6,[8][9][10][11], advanced oxidation processes [12][13][14][15][16][17][18], adsorption [19][20][21][22][23], ion flotation [24], and sedimentation [25]. Unfortunately, physicochemical treatments are often expensive, and biological approaches are typically slow and poorly efficient [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Role of pH in the Aqueous Phase Reactivity of Zerovalent Iron Nanoparticles with Acid Orange 7, a Model Molecule of Azo Dyes

Freyria

Esposito

Armandi

et al. 2017

Journal of Nanomaterials

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The effect of both pH and surface oxidation of nanoparticles is studied on the interaction between a commercial slurry of Nanoscale Zerovalent Iron (NZVI) and the azo dye Acid Orange 7 (AO7). NZVI is a reducing agent used for the degradation of several pollutants, including azo dyes: during pollutant degradation, it undergoes progressive oxidation and dissolution. Though it is generally acknowledged that NZVI consists of core-shell nanoparticles, where the core of metallic iron is covered by Fe O shell, it still remains a poorly defined system. In this work, the solid fraction recovered by filtration and drying was characterized by means of XRD diffraction with Rietveld refinement, N 2 isotherms at 77 K, FE-SEM and TEM observation, EDX analysis, and IR spectroscopy. Powders were obtained from both the parent slurry and the same slurry pretreated with HCl in order to remove Fe O shell, finally reactivating the nanoparticles. The aforementioned physicochemical characterization allowed figuring out some correlations between the properties of the studied nanomaterial and the processes occurring when it is in contact with AO7 in aqueous phase. The type of interaction occurring within the NZVI/AO7 system (adsorption and type of redox reactions) strongly depends not only on the pH of the starting solution, but also on the surface oxidation of the nanoparticles.

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Nanocomposite materials for photocatalytic degradation of pollutants

Cited by 168 publications

References 171 publications

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

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

Colloidal Nanocrystalline Semiconductor Materials as Photocatalysts for Environmental Protection of Architectural Stone

Role of pH in the Aqueous Phase Reactivity of Zerovalent Iron Nanoparticles with Acid Orange 7, a Model Molecule of Azo Dyes

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