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6 results on '"Cesano, F"'

1. Chitosan-derived iron oxide systems for magnetically guided and efficient water purification processes from polycyclic aromatic hydrocarbons

Author

Nistico', R, Franzoso, F, Cesano, F, Scarano, D, Magnacca, G, Parolo, M, Carlos, L, Cesano, Fo, Parolo, ME., Nistico', R, Franzoso, F, Cesano, F, Scarano, D, Magnacca, G, Parolo, M, Carlos, L, Cesano, Fo, and Parolo, ME.

Abstract

Chitosan and pyrolyzed chitosan, acting as protective frameworks of magnetic nanoparticles (magnetite/maghemite and/or metallic Fe), have been investigated to be used in magnetically guided water remediation processes from polycyclic aromatic hydrocarbons (PAHs). Chitosan-derived magnet-sensitive materials were first obtained by a one-step coprecipitation method, and then two carbon-derived magnetic chitosan materials were obtained under N2 gas flow at 550 and 800 °C, respectively. The obtained materials were investigated by means of X-ray diffraction (XRD), FTIR spectroscopy, scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), atomic force microscopy (AFM), magnetic force microscopy (MFM), and magnetization measurements. Thermal treatment conditions, along with the amounts of chitosan used in the synthesis processes, played a critical role in the crystal structure and magnetic properties of the obtained nanomaterials. The adsorption capacity of chitosan-derived magnet-sensitive materials was tested toward PAHs. The results indicate high sorption capacity for anthracene and naphthalene onto the chitosan-derived material pyrolyzed at 550 °C. Furthermore, experiments performed with a mixture of eight PAHs show that PAH molecules with higher hydrophobicity and more extended aromaticity had stronger sorption capacity. Interestingly, due to the obtained results, the use of chitosan is encouraged as a platform for the creation of green adsorbents for further developments in wastewater purification treatments.

Published
2017

3. Furfuryl alcohol polymerization in H-Y confined spaces: reaction mechanism and structure of carbocationic intermediates

Author

Bertarione, S., Bonino, F., Cesano, F., Damin, A., Scarano, D., and Zecchina, A.

Subjects
Polymerization -- Analysis, Adsorption -- Analysis, Zeolites -- Structure, Zeolites -- Chemical properties, Zeolites -- Mechanical properties, Fourier transform infrared spectroscopy -- Analysis, Chemicals, plastics and rubber industries
Abstract

The acid-catalyzed polymerization and resinification of furfuryl alcohol adsorbed in the framework of a protonic Y zeolite is analyzed by using various spectroscopic methods. The studies have shown that the length of the oligomers and of the catonic species has increased with increasing temperature and amorphous carbon is formed on H-Y zeolite.

Published
2008

4. Chitosan-Derived Iron Oxide Systems for Magnetically Guided and Efficient Water Purification Processes from Polycyclic Aromatic Hydrocarbons

Author

Giuliana Magnacca, Roberto Nisticò, Maria Eugenia Parolo, Flavia Franzoso, Domenica Scarano, Federico Cesano, Luciano Carlos, Nistico', R, Franzoso, F, Cesano, F, Scarano, D, Magnacca, G, Parolo, M, and Carlos, L

Subjects
Materials science, CHIM/03 - CHIMICA GENERALE ED INORGANICA, iron oxides, Scanning electron microscope, Coprecipitation, General Chemical Engineering, carbon coating, chitosan, iron oxides, magnetic materials, PAH adsorption, pyrolysis, PAH adsorption, Analytical chemistry, Maghemite, Carbon coating, 02 engineering and technology, MAGNETIC MATERIALS, 010501 environmental sciences, engineering.material, 01 natural sciences, Nanomaterials, Magnetization, Iron oxide, Environmental Chemistry, High-resolution transmission electron microscopy, Magnetic material, IRON OXIDES, CHITOSAN, 0105 earth and related environmental sciences, Chitosan, Renewable Energy, Sustainability and the Environment, PYROLYSIS, Otras Ciencias Químicas, Ciencias Químicas, General Chemistry, Pyrolysi, 021001 nanoscience & nanotechnology, pyrolysis, PAH ADSORPTION, CARBON COATING, 6. Clean water, Chemical engineering, 13. Climate action, engineering, Magnetic nanoparticles, Iron oxides, Magnetic materials, Pyrolysis, magnetic materials, Magnetic force microscope, 0210 nano-technology, CIENCIAS NATURALES Y EXACTAS
Abstract

Chitosan and pyrolyzed chitosan, acting as protective frameworks of magnetic nanoparticles (magnetite/maghemite and/or metallic Fe), have been investigated to be used in magnetically guided water remediation processes from polycyclic aromatic hydrocarbons (PAHs). Chitosan-derived magnet-sensitive materials were first obtained by a one-step coprecipitation method, and then two carbon-derived magnetic chitosan materials were obtained under N2 gas flow at 550 and 800 °C, respectively. The obtained materials were investigated by means of X-ray diffraction (XRD), FTIR spectroscopy, scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), atomic force microscopy (AFM), magnetic force microscopy (MFM), and magnetization measurements. Thermal treatment conditions, along with the amounts of chitosan used in the synthesis processes, played a critical role in the crystal structure and magnetic properties of the obtained nanomaterials. The adsorption capacity of chitosan-derived magnet-sensitive materials was tested toward PAHs. The results indicate high sorption capacity for anthracene and naphthalene onto the chitosan-derived material pyrolyzed at 550 °C. Furthermore, experiments performed with a mixture of eight PAHs show that PAH molecules with higher hydrophobicity and more extended aromaticity had stronger sorption capacity. Interestingly, due to the obtained results, the use of chitosan is encouraged as a platform for the creation of green adsorbents for further developments in wastewater purification treatments. Fil: Nisticò, Roberto. Università di Torino; Italia Fil: Franzoso, Flavia. Università di Torino; Italia Fil: Cesano, Federico. Università di Torino; Italia Fil: Scarano Domenica. Università di Torino; Italia Fil: Magnacca, Giuliana. Università di Torino; Italia Fil: Parolo, Maria Eugenia. Universidad Nacional del Comahue; Argentina Fil: Carlos, Luciano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas. Universidad Nacional del Comahue. Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas; Argentina

Published
2017

5. MoS2 Nanoparticles Decorating Titanate-Nanotube Surfaces: Combined Microscopy, Spectroscopy, and Catalytic Studies.

Author

Cravanzola S, Muscuso L, Cesano F, Agostini G, Damin A, Scarano D, and Zecchina A

Abstract

MoS2/TNTs composites have been obtained by impregnation of titanate nanotubes (TNTs) with a centrifuged solution of nanosized MoS2 particles in isopropyl alcohol (IPA). The characterization has been performed by combining UV-vis-NIR, Raman, AFM, and HRTEM analyses, before and after impregnation. HRTEM images show that the contact between single-layer MoS2 nanoparticles and the support is efficient, so justifying the decoration concept. The volatility of IPA solvent allows the preparation of composites at low temperature and free of carbonaceous impurities. MoS2 nanoparticles have strong excitonic transitions, which are only slightly shifted with respect to the bulk because of quantum size effects. Concentrations of MoS2, less than 0.1 wt %, are enough to induce strong absorption in the visible. Photodegradation of methylene blue (MB) has been performed on TNTs and MoS2/TNTs to verify the effect of the presence of MoS2. The first layer of adsorbed MB is consumed first, followed by clustered MB in the second and more external layers. The presence of low concentrated MoS2 nanoparticles does not substantially alter the photocatalytic properties of TNTs. This result is due to poor overlapping between the high frequency of MoS2 C, D excitonic transitions and the TNTs band gap transition.

Published
2015
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6. Thickness of multiwalled carbon nanotubes affects their lung toxicity.

Author

Fenoglio I, Aldieri E, Gazzano E, Cesano F, Colonna M, Scarano D, Mazzucco G, Attanasio A, Yakoub Y, Lison D, and Fubini B

Subjects
Animals, Biological Transport, Bronchoalveolar Lavage Fluid chemistry, Bronchoalveolar Lavage Fluid cytology, Cell Count, Female, Glutathione metabolism, L-Lactate Dehydrogenase metabolism, Lung metabolism, Macrophages, Alveolar metabolism, Mice, Microscopy, Electron, Transmission, Nanotubes, Carbon ultrastructure, Particle Size, Rats, Rats, Wistar, Reactive Oxygen Species metabolism, Spectrum Analysis, Raman, Surface Properties, Lung drug effects, Macrophages, Alveolar drug effects, Nanotubes, Carbon chemistry, Nanotubes, Carbon toxicity
Abstract

Two samples of highly pure multiwalled carbon nanotubes (MWCNTs) similar in hydrophobicity and surface reactivity were prepared with similar length, <5 μm, but markedly different diameter (9.4 vs 70 nm). The samples were compared for their cytotoxic activity, uptake, and ability to induce oxidative stress (ROS production and intracellular GSH depletion) in vitro in murine alveolar macrophages (MH-S). The in vivo toxicity was evaluated by measuring biochemical (LDH activity and total proteins) and cellular responses in bronchoalveolar lavage (BAL) after intratracheal instillation in rats. Both samples were internalized in MH-S cells. However, thin MWCNTs appeared significantly more toxic than the thicker ones, both in vitro and in vivo, when compared on a mass-dose basis. The data reported herein suggest that the nanotube diameter is an important parameter to be considered in the toxicological assessment of CNTs.

Published
2012
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