New Surface Properties in Porcelain Gres Tiles with a Look to Human and Environmental Safety

Bianchi, Claudia L.; Pirola, Carlo; Gatto, S.; Nucci, S.; Minguzzi, Alessandro; Cerrato, G.; Biella, S.; Capucci, V.

doi:10.1155/2012/970182

Cited by 10 publications

(11 citation statements)

References 18 publications

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“…Currently, one of the most interesting photocatalytic materials on the market is the porcelain stoneware, which combines the beauty of a design product with both the hardness and absence of porosity, and thus is used for both floors and walls [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Digitally Printed AgNPs Doped TiO2 on Commercial Porcelain-Grès Tiles: Synergistic Effects and Continuous Photocatalytic Antibacterial Activity

et al. 2020

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In the present study, we use commercial digitally printed ceramic tiles, functionnalized by AgNPs doped micro–TiO2, to investigate the mechanism of Ag in the continouos photocatalytic antibacterial activity. The novelty of the research lies in the attempt to understand the mechanism of Ag, supported on TiO2, able to exhibit the same antibacterial activity of a standard system containing Ag species, but here, totally embedded on the tile surface, and thus not free to move and damage the bacteria cell. UV/vis diffuse reflectance spectroscopy (DRS) of AgNPs–TiO2 tiles indicated an enhanced visible light response, wherein a new absorption band was produced around 18,000–20,000 cm−1 (i.e., in the 400–600 nm range) owing to the surface plasmon resonance (SPR) of AgNPs. The antibacterial photocatalytic experiments were conducted towards the inactivation of E. coli under solar light and indoor light. It was found that the degradation speed of E. coli in the presence of AgNPs–TiO2 tiles is solar light-intensity depending. This justifies the semiconductor behavior of the material. Furthermore, the AgNPs–TiO2 tiles exhibit a high ability for the inactivation of E. coli at a high load (104–107 colony-forming unit (CFU)/mL). Additionally, AgNPs–TiO2 tiles showed a remarkable antibacterial activity under indoor light, which confirms the good photocatalytic ability of such tiles. On the basis of the reactive oxygen species (ROS) quenching experiments, O2•− species and h+ were more reactive for the inactivation of E. coli rather than •OH species. This is because of the different lifetime (bacteria are more likely oxidized by ROS with longer lifetime); in fact, O2•− and h+ exhibit a longer lifetime compared with •OH species. The generation of H2O2 as the most stable ROS molecule was also suggested.

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Section: Introductionmentioning

confidence: 99%

Digitally Printed AgNPs Doped TiO2 on Commercial Porcelain-Grès Tiles: Synergistic Effects and Continuous Photocatalytic Antibacterial Activity

et al. 2020

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“…P25 by Evonik is usually used as reference photocatalyst, while TiO 2 1077 by Kronos is commercially classified as pigment. The main characteristics of these samples have been already reported elsewhere [27]. 1077 by Kronos was also coated on tiles to obtain the commercially available photoactive porcelain grés tiles (named Orosei Active TM ): for this preparation TiO 2 powder was mixed with a silicabased compound, sprayed on the tile surface, fired in an industrial kiln a 680°C and cleaned with a rotating wire brush to remove the TiO 2 weakly stuck at the tile surface, as already reported [27].…”

Section: Experimental Materials and Methodsmentioning

confidence: 97%

Micro-sized TiO2 catalyst in powder form and as coating on porcelain grès tile for the photodegradation of phenol as model pollutant for water phase

Bianchi¹,

Pirola²,

Cerrato³

et al. 2017

Adv Mater Sci

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In presence of TiO 2 and irradiation, phenol can be degraded by hydroxyl radicals or directly via photogenerated carriers, as occurs in photocalytic processes. In this work a commercial micro-sized TiO 2 sample in powder form and industrially coated on porcelain grès tiles were tested in water remediation with phenol as model molecule. Firstly, we investigated the behaviour of the commercial micro-sized TiO 2 comparing the results with reference nano-sized catalyst in the phenol photodegradation process, widely studied in the last decades. Following the phenol concentration as well as the main intermediates formation over time by HPLC analysis, and the mineralization by TOC analysis, we presented results about the photocatalytic behaviour in terms of adsorption, by-products formation, and reaction rate at different phenol starting concentrations. In particular, with the photocatalytic tiles, phenol photodegradation percentage is almost the same at 15 ad 25 ppm (78% and 73% respectively), and much lower at 50 ppm (46%) after 6 hours of test.

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“…For this reason, the use of micrometric TiO 2 becomes more and more interesting and few years ago some investigations demonstrated the possibility to use this material for the photodegradation of pollutant molecules, such as volatile organic compounds (VOCs), nitrogen oxides (NO x ) or organic molecules that mainly pollute the water systems [23,24]. It has also been successfully used in building materials to exploit self-cleaning and antibacterial effects [25].…”

Section: Introductionmentioning

confidence: 99%

“…The coating of TiO 2 allows conferring the material surfaces all the properties of TiO 2 as semiconductor [26]. It is already widely used on different materials, for different applications: on exterior construction materials [27,28] for water [3] and air purification [29], for the preparation of self-cleaning and antibacterial cements [30], on tiles [23,31], on glass [32], and, recently, for the protection of the cultural heritage [33]. Most of these materials are currently prepared with nanometric titanium dioxide, with all the ensuing problems described above.…”

Section: Introductionmentioning

confidence: 99%

A New Frontier of Photocatalysis Employing Micro-Sized TiO2: Air/Water Pollution Abatement and Self-Cleaning/ Antibacterial Applications

Bianchi¹,

Pirola²,

Sacchi³

et al. 2016

Semiconductor Photocatalysis - Materials, Mechanisms and Applications

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This chapter presents the use of a commercial micro-sized TiO 2 powder as an alternative to the traditional nano-powders as semiconductors in photocatalytic processes. Results of the photocatalytic efficiency towards the photodegradation of the traditional pollutant molecules both in gas phase (nitrogen oxides (NO x) and volatile organic compounds (VOCs)) and in water phase (phenol) are presented and compared to the results obtained with two nano-sized reference powders. Micro-sized TiO 2 is also industrially coated at the surfaces of porcelain grés tiles (Active Clean Air and Antibacterial Ceramic™). The possibility to have a photocatalytic material, strongly stuck at the surface of a vitrified tile, increases the use of photocatalysis in real conditions: no problem of filtration of the semiconductor from the liquid medium after use and no risks of leakage of nanoparticles in the atmosphere. Tests were performed using reactors equipped with UV-A lamps and with suitable analytical systems, depending on the final purpose. Characterization data from both powders and coated tiles are put in correlation with the photocatalytic results to understand the semiconductor action during the photocatalytic process. Polluting molecules were chosen in order to cover all the common aspects of environmental pollution: NO x and some VOCs represent the model molecules to test the efficiency of the micro-sized TiO 2 (degradation from the pristine molecule to CO 2 or inorganic salts) in gas phase. As for the water pollution, phenol was chosen as common pollutant in worldwide rivers. Moreover, tests on self-cleaning and antibacterial properties are also reported. The positive results of micro-sized TiO 2 both in powder and coated onto the surface of porcelain grés tiles open the way to new photocatalytic products that do

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New Surface Properties in Porcelain Gres Tiles with a Look to Human and Environmental Safety

Cited by 10 publications

References 18 publications

Digitally Printed AgNPs Doped TiO2 on Commercial Porcelain-Grès Tiles: Synergistic Effects and Continuous Photocatalytic Antibacterial Activity

Digitally Printed AgNPs Doped TiO2 on Commercial Porcelain-Grès Tiles: Synergistic Effects and Continuous Photocatalytic Antibacterial Activity

Micro-sized TiO2 catalyst in powder form and as coating on porcelain grès tile for the photodegradation of phenol as model pollutant for water phase

A New Frontier of Photocatalysis Employing Micro-Sized TiO2: Air/Water Pollution Abatement and Self-Cleaning/ Antibacterial Applications

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