Self-Cleaning Mineral Paint for Application in Architectural Heritage

Pal, Sudipto; Contaldi, Vincenzo; Licciulli, Antonio; Marzo, Fabio

doi:10.3390/coatings6040048

Cited by 31 publications

(21 citation statements)

References 22 publications

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“…The contact angle of water droplets on graphene and graphene-TiO2 films are shown in Figure S5, where it is found that graphene-TiO2 film is highly wetting (small contact angle) and therefore superhydrophilic. This is due to the hydrogen bonding and strong interlinking between Ti-O and unsaturated -O and -OH groups on graphene [12,[40][41][42]. It is known that TiO2 surface is self-cleaning, meaning that it removes the surface dirt, such as organic compounds.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Graphene-TiO2 Thin Films Fabricated by Low-Temperature Ultrasonic Vibration-Assisted Spin and Spray Coating in a Sol-Gel Process

2017

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Abstract:In this work, we communicate a facile and low temperature synthesis process for the fabrication of graphene-TiO 2 photocatalytic composite thin films. A sol-gel chemical route is used to synthesize TiO 2 from the precursor solutions and spin and spray coating are used to deposit the films. Excitation of the wet films during the casting process by ultrasonic vibration favorably influences both the sol-gel route and the deposition process, through the following mechanisms. The ultrasound energy imparted to the wet film breaks down the physical bonds of the gel phase. As a result, only a low-temperature post annealing process is required to eliminate the residues to complete the conversion of precursors to TiO 2 . In addition, ultrasonic vibration creates a nanoscale agitating motion or microstreaming in the liquid film that facilitates mixing of TiO 2 and graphene nanosheets. The films made based on the above-mentioned ultrasonic vibration-assisted method and annealed at 150 • C contain both rutile and anatase phases of TiO 2 , which is the most favorable configuration for photocatalytic applications. The photoinduced and photocatalytic experiments demonstrate effective photocurrent generation and elimination of pollutants by graphene-TiO 2 composite thin films fabricated via scalable spray coating and mild temperature processing, the results of which are comparable with those made using lab-scale and energy-intensive processes.

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Section: Resultsmentioning

confidence: 99%

Photocatalytic Graphene-TiO2 Thin Films Fabricated by Low-Temperature Ultrasonic Vibration-Assisted Spin and Spray Coating in a Sol-Gel Process

2017

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“…Thus, the protection of stone-built cultural heritage has attracted the attention of researchers in various fields. Stone-built cultural heritage exposed to weather conditions can be damaged by acid rain corrosion [1][2][3][4], industrial pollution [5,6], microbial erosion [7,8], and soluble salt crystallization [9]. Coating stone is an effective way to protect stone-built cultural relics from damage [10].…”

Section: Introductionmentioning

confidence: 99%

Study of TiO2-Modified Sol Coating Material in the Protection of Stone-Built Cultural Heritage

et al. 2020

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Coating materials can effectively protect stone-built cultural heritage and, as such, research into coating materials has gained comprehensive attention from researchers. The aim of this work is to prepare a TiO 2 -modified sol coating material (TSCM) and study its protective effects on stone-built cultural heritage. TSCM and pure TiO 2 sol (p-sol, unmodified; for comparison) were applied evenly over the entire surface of stone samples. The prepared stone samples included untreated stone, stone treated with pure sol, and stone treated with TSCM. The protective effects of TSCM were evaluated by water absorption, water vapor permeability, acid resistance, and weather resistance experiments. The results show that stone treated with TSCM has excellent water absorption and water vapor permeability, strong acid resistance, and good weather resistance, compared with untreated stone or stone treated with p-sol. The acid resistance of stone treated by TSCM was 1.75 times higher than that treated with traditional coating materials. The weather resistance cycle number of stone treated by TSCM was four times higher than that treated with organic protective materials. These findings are expected to provide useful suggestions for the protection of stone-built cultural heritage.Coatings 2020, 10, 179 2 of 11 or added to acrylic polymers [22][23][24], but they could be easily removed from the coating surface owing to weak bonding [25][26][27]. In order to avoid the loss of TiO 2 nanoparticles, some researchers have proposed to composite TiO 2 nanoparticles into a SiO 2 -sol [28], which can enhance its photocatalytic activity when applied to a building. To the best of our knowledge, there have been no scientific studies about compositing TiO 2 nanoparticles into a TiO 2 -sol for the protection of stone-built cultural heritage. More importantly, the method presented in the work of [28] provides us with valuable suggestions about the protection of stone-built cultural heritage. Hence, it is necessary to investigate a modified TiO 2 -sol with significant protective effect on stone-built cultural heritage.The aim of this paper is to prepare a TiO 2 -modified sol coating material (TSCM) that is capable of protecting stone-built cultural heritage. Analyses of the composition and microscopic morphology of TSCM were conducted using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Some experiments were conducted to evaluate the protective effects of TSCM, in terms of wettability, weather resistance, and acid resistance. The results suggest that TSCM has excellent water absorption, water vapor permeability, acid resistance, and weather resistance. The study, therefore, provides a new method for the protection of stone-built cultural heritage.

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“…Mineral photocatalytic paints usually exhibit lower photocatalytic activity than the acrylic ones, but they have better stability during exposure to solar radiation 18 . For practical application of the photocatalytic paints it is important to determine the optimal thickness of the paint layer which is active under irradiation of light, because photocatalytic paint should be used only as an outer layer for coating.…”

mentioning

confidence: 99%

Impact of paint matrix composition and thickness of paint layer on the activity of photocatalytic paints

Homa

Tryba

Gęsikiewicz-Puchalska

2017

Polish Journal of Chemical Technology

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Silicate, acrylic and latex photocatalytic paints were analyzed in regards to impact of paint matrix composition and paint layer's thickness on performance in two photocatalytic tests. These included performances in photocatalytic decomposition of benzo[a]pyrene (BaP) and assessment of photocatalytic activity through use of smart ink test. Silicate photocatalytic paints displayed lower photocatalytic activity in comparison to acrylic and latex photocatalytic paints in both tests, despite the similar content of nanocrystalline TiO 2 . Measurements of depth of UV light penetration through the paints layer were performed and it appeared, that more porous structure of coating resulted in deeper penetration of UV light. In the case of acrylic paint, the thickness of the photocatalytic layer was around 9 μm, but for silicate paint DR this thickness was higher, around 21 μm.

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Self-Cleaning Mineral Paint for Application in Architectural Heritage

Cited by 31 publications

References 22 publications

Photocatalytic Graphene-TiO2 Thin Films Fabricated by Low-Temperature Ultrasonic Vibration-Assisted Spin and Spray Coating in a Sol-Gel Process

Photocatalytic Graphene-TiO2 Thin Films Fabricated by Low-Temperature Ultrasonic Vibration-Assisted Spin and Spray Coating in a Sol-Gel Process

Study of TiO2-Modified Sol Coating Material in the Protection of Stone-Built Cultural Heritage

Impact of paint matrix composition and thickness of paint layer on the activity of photocatalytic paints

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