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Castellarano, Italy

Bianchi C.L.,University of Milan | Bianchi C.L.,Consortium for Science and Technology of Materials | Pirola C.,University of Milan | Pirola C.,Consortium for Science and Technology of Materials | And 9 more authors.
RSC Advances | Year: 2015

With TiO2-photocatalysis being an effective alternative to other more expensive Advanced Oxidation Processes (AOPs), the possibility of using micro-sized TiO2 materials rather than the well-known nano-sized powders is an important goal in terms of both handling safety and cost saving. In this work the photodegradation of ethanol, used as a model VOC (Volatile Organic Compound) molecule, was investigated, comparing the efficiency of both commercial nano- and micro- sized TiO2 samples. In all cases the same degradation pathway was observed, namely, a consecutive first-order reaction with acetaldehyde as an intermediate product and CO2 and water as the final products. All photocatalysts were characterized by means of XRD, TEM, IR, BET and XPS analysis. A kinetic model was also developed considering the collected experimental data and a regression of both adsorption and kinetic constants was made using MATLAB software. The optimized parameters were used for simulating the experimental data using an ode15s algorithm. This journal is © The Royal Society of Chemistry. Source

Bianchi C.L.,University of Milan | Bianchi C.L.,Consortium for Science and Technology of Materials | Pirola C.,University of Milan | Pirola C.,Consortium for Science and Technology of Materials | And 8 more authors.
Advances in Materials Science and Engineering | Year: 2012

Traditional photocatalysis is here brought forward for both the use of nanosized TiO2 crystallites and the possibility to have a release of TiO2 particles during the final use of the manufactured products. In the present paper both the preparation and characterization of a new generation of photocatalytic tiles are presented. The originality of these products is the surface presence of microsized TiO2 as it is not clear yet the impact of the nanoparticles on both human and environmental safety. TiO2 is here mixed with a silica compound and the final thermal treatment at 680°C allows the complete surface vitrification which, in turn, makes the tiles surface strongly resistant to abrasion. Photocatalytic efficiency towards the degradation of NOxin gas phase was measured in both a batch and a plug-flow reactor. The latter reactor configuration was also modeled by digital simulations. Copyright © 2012 C. L. Bianchi et al. Source

Bianchi C.L.,University of Milan | Colombo E.,University of Milan | Gatto S.,University of Milan | Stucchi M.,University of Milan | And 3 more authors.
Journal of Photochemistry and Photobiology A: Chemistry | Year: 2014

Some particular drawbacks due to the industrial use of nano-sized TiO 2 (safety, recovery) in photocatalytic processes for water remediation can be avoided choosing micro-sized TiO2. Tests on both micro-sized TiO2 powder and industrially prepared photocatalytic tiles, having the surface of porcelain-grès tiles hot-coated with the same photocatalyst, were performed. Good photocatalytic performance in the degradation of three organic dyes (rhodamine B, crystal violet and methylene blue) in water phase were achieved. Photocatalytic tiles can really represent a good alternative to TiO2 suspensions and pave the way for the fully industrial use of photocatalysis in environmental remediation. © 2014 Elsevier B.V. Source

Bianchi C.L.,University of Milan | Bianchi C.L.,Consortium for Science and Technology of Materials | Gatto S.,University of Milan | Pirola C.,University of Milan | And 7 more authors.
Applied Catalysis B: Environmental | Year: 2014

Volatile organic compounds (VOCs) are prevalent components of indoor air pollution. The photocatalytic degradation could be an interesting method to degrade them.This paper reports the photoactivity study of two classical nano-sized and two micro-sized commercial TiO2 powdered samples. Photocatalytic tests have been performed following the degradation of acetone, acetaldehyde and toluene in the gas phase under UV light. An accurate study of the intermediate oxidation products was performed. XPS and FTIR analyses allowed to highlight the relationship between TiO2 surface properties and reactivity toward VOCs explaining the different behavior of the photocatalyst in case of hydrophilic and hydrophobic pollutants. © 2013 Elsevier B.V. Source

Cannillo V.,University of Modena and Reggio Emilia | Esposito L.,Centro Ceramico Bologna | Pellicelli G.,GranitiFiandre SpA | Sola A.,University of Modena and Reggio Emilia | Tucci A.,Centro Ceramico Bologna
Journal of the European Ceramic Society | Year: 2010

Innovative porcelain stoneware tiles with a surface layer containing 2.4. wt% of stainless-steel particles were produced by the Double Charge Technology. Considering this layer as a composite material, the effects of the metal particles on the mechanical behaviour of the ceramic matrix were extensively investigated in terms of Young's modulus, fracture toughness and flexural strength. With this aim, composite materials were prepared by using the same silicate-based ceramic matrix with increasing weight percentages of the same stainless-steel powder. The composites were accurately characterised. In particular, due to the high sintering temperature, possible changes at the interface between metal particles and ceramic matrix were thoroughly analysed by means of SEM and EDS microanalysis. To clarify the role of the observed chromium-rich interphase on the mechanical behaviour of the steel particles-stoneware composites, analytical equations were used and simulations were performed by using the Object Oriented Finite (OOF) element method. © 2010 Elsevier Ltd. Source

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