Self-cleaning TiO2 coatings for building materials: The influence of morphology and humidity in the stain removal performance

Cedillo-González, Erika Iveth; Hernández-López, Juan Manuel; Ruiz-Valdés, J.J.; Barbieri, Virginia; Siligardi, Cristina

doi:10.1016/j.conbuildmat.2019.117692

Cited by 19 publications

(5 citation statements)

References 42 publications

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“…Thus, it is difficult to directly compare stearic acid decomposition rate values obtained for TiO2 films in the literature. Our results coincide with the ones obtained by Cedillo-Gonzalez et al [37]. In their study, they have shown that spin-coated TiO2 film with a thickness of 150 nm exhibit stearic acid degradation rate constant of 0.0017 min -1 under UV-A irradiation.…”

Section: Photocatalytic Activitysupporting

confidence: 93%

Thickness Effect on Photocatalytic Activity of TiO2 Thin Films Fabricated by Ultrasonic Spray Pyrolysis

et al. 2020

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In this study, TiO2 thin films were deposited by ultrasonic spray pyrolysis from solutions with concentrations of 0.1 and 0.2 M. The deposition temperature was adjusted at 350 °C and all samples were annealed at 500 °C for 1 h in air. The thickness of TiO2 films was changed in the range of 50 to ca. 800 nm by varying the number of spray cycles from 1 to 21 and the solution concentration. The results showed that the mean crystallite size of the anatase structure, the surface roughness, and light absorption increased with the film thickness. The effect of film thickness on the photocatalytic activity was investigated with the photodegradation of stearic acid under UV-A irradiation. The optimal thickness of TiO2 films fabricated by ultrasonic spray pyrolysis for photocatalytic self-cleaning applications was in the range of 170–230 nm, indicating a ca. 2.6 times-higher photocatalytic self-cleaning activity compared to the reference sample, Pilkington ActivTM. The photocatalytic results showed that the 190 nm-thick TiO2 film deposited from the 0.1 M solution applying seven spray cycles exhibited the finest grain structure and maximum photocatalytic activity, leading to 94% of stearic acid degradation in 180 min under UV-A light with the reaction rate constant k = 0.01648 min−1.

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Section: Photocatalytic Activitysupporting

confidence: 93%

Thickness Effect on Photocatalytic Activity of TiO2 Thin Films Fabricated by Ultrasonic Spray Pyrolysis

et al. 2020

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“…Two lines of research very active in this historical moment are, for example, those regarding the development of highly reflective coatings for low-energy impact buildings and that of self-cleaning and catalytic coatings. 106 Modified enamel coatings have been considered as suitable candidates to address these issues as many encouraging results are published in the literature on these topics, 107,108 even if further developments are needed to make this type of technology mature. We are expecting more research on these topics, and we really believe that new applications will be developed soon, probably being able to degrade organic pollutants 109 or even kill viruses or bacteria.…”

Section: Conclusion and Future Outlookmentioning

confidence: 99%

Durability of vitreous enamel coatings and their resistance to abrasion, chemicals, and corrosion: a review

2020

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Vitreous enamels represent a class of coatings with different technological properties, mainly appreciated for the protection they guarantee to the covered substrates. This review introduces enamel coatings, describing their production technologies and presenting the main properties affecting the enamel’s durability. Firstly, this review article introduces the most important studies regarding the improvement in abrasion resistance, highlighting both successes and failures. Afterward, the work reveals an outlook about the resistance to chemicals, underlining the good resistance of enamels toward acidic chemicals and discussing the results of studies aimed to improve their performances toward alkaline solutions. This review also considers the corrosion protection property of enamels, highlighting the high barrier effect they provide against the absorption of aggressive substances toward metal substrates. Finally, new perspectives and possible future research paths are presented, being aware that this kind of coating offers both good product protection and functional integrity over time.

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“…should be considered [39][40][41][42]. Humidity plays a very important role in stain removal, by influencing the hydration state of TiO 2 this will increase the cumulative hydroxyl ion concentration that will lead to sustainable self-cleaning materials for buildings [43][44][45][46][47][48][49][50].…”

Section: Coatings For Building Materialsmentioning

confidence: 99%

Nano TiO₂-Based Smart Superhydrophilic Self-Cleaning Surfaces

Mittal¹

2023

Photocatalysts - New Perspectives

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In this chapter, we have focused on the use of self-cleaning coating or surfaces which have more concerning the field of research due to the rising demand for self-disinfected and hygienic surfaces. Self-cleaning coatings can be used in automobile windshields, textiles, antifouling membranes, paints, building construction material, optoelectronic devices like solar panels, and in the medical aids and food industry. This chapter gives an outlook on nano TiO2-based superhydrophilic self-cleaning surfaces. The mechanism of superhydrophilicity of nano TiO2-based systems and photocatalytic properties are cautiously investigated. The photocatalytic behavior and superhydrophilicity of TiO2 are based on the photogenerated electron–hole pair. This chapter gives a general idea of a variety of systems and methods that could improve the self-cleaning behavior of TiO2 in the solar spectrum in view of the fact that TiO2 is only ultraviolet responsive. Evidences have indicated that the superhydrophilic wetting and antifogging performance are affected by porosity and surface hydroxyl (-OH) contents. In this chapter, the effect of multilayer assembly and the role of cumulative concentration of –OH groups on photocatalytic behavior is also discussed.

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Self-cleaning TiO2 coatings for building materials: The influence of morphology and humidity in the stain removal performance

Cited by 19 publications

References 42 publications

Thickness Effect on Photocatalytic Activity of TiO2 Thin Films Fabricated by Ultrasonic Spray Pyrolysis

Thickness Effect on Photocatalytic Activity of TiO2 Thin Films Fabricated by Ultrasonic Spray Pyrolysis

Durability of vitreous enamel coatings and their resistance to abrasion, chemicals, and corrosion: a review

Nano TiO₂-Based Smart Superhydrophilic Self-Cleaning Surfaces

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Self-cleaning TiO2 coatings for building materials: The influence of morphology and humidity in the stain removal performance

Cited by 19 publications

References 42 publications

Thickness Effect on Photocatalytic Activity of TiO2 Thin Films Fabricated by Ultrasonic Spray Pyrolysis

Thickness Effect on Photocatalytic Activity of TiO2 Thin Films Fabricated by Ultrasonic Spray Pyrolysis

Durability of vitreous enamel coatings and their resistance to abrasion, chemicals, and corrosion: a review

Nano TiO2-Based Smart Superhydrophilic Self-Cleaning Surfaces

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Product

Resources

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Nano TiO₂-Based Smart Superhydrophilic Self-Cleaning Surfaces