UV / visible sol gel W–TiO2 photocatalytic coatings for interior building surfaces

Giampiccolo, Andrea; Tobaldi, David Maria; Jones, E. Alison; Labrincha, J.A.; Kurchania, Rajnish; Ansell, Martin P.; Ball, Richard

doi:10.1016/j.buildenv.2021.108203

Cited by 10 publications

(5 citation statements)

References 87 publications

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“…Photocatalyst activity indicator inks, in particular the Rz paii , have proved popular for assessing the photocatalytic activity of new materials. Table provides some examples of the reported uses of the Rz ink. − One of the more innovative uses of the Rz ink comes from the group of Parkin at University College London, in their studies of photocatalyst films generated by CVD . These workers used combinatorial atmospheric chemical vapor deposition to generate a graduating substitutional/interstitial N-doped anatase TiO 2 thin film on a 50 mm × 225 mm × 3.2 mm standard float glass plate.…”

Section: Applications Of Paiismentioning

confidence: 83%

Photocatalyst Activity Indicator Inks, paiis, for Assessing Self-Cleaning Films

2021

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Conspectus Semiconductor photocatalysis, usually referred to simply as “photocatalysis” is a relatively new and yet still a growing subject area, which has led to a billion-dollar industry, mostly focused on the production of self-cleaning architectural materials, such as glass, paint, tiles, fabric, plastic and concrete. All such materials need to be tested for activity, but for self-cleaning activity there are few appropriate tests; the International Standards Organization, ISO, for example, have at present only two, both of which are slow and largely ineffective for most commercial self-cleaning products. The photocatalyst community in general, and the manufacturers of self-cleaning photocatalytic products in particular, need a fast, simple, easy to use method of assessing photocatalytic activity, which can also be used to demonstrate the efficacy of self-cleaning materials in minutes, i.e., a quantitative and qualitative test. In this account we highlight our work on photocatalyst activity indicator inks, i.e., paiis, which address the above need and work via the photocatalyzed reduction of a dye, usually resazurin, Rz, and concomitant oxidation of an organic, almost always glycerol. We describe our early work on the Rz ink which showed that, when used to assess photocatalytic film activity, the measured rate of change in color is directly proportional to the measured rate of photocatalyzed mineralization of the popular test pollutants stearic acid, SA, and methylene blue, MB, by O2. We show that photography, coupled with digital color analysis, is just as effective and much less expensive at measuring the rate of color change exhibited by paiis as UV/vis spectrophotometry and also can be used for testing clear and opaque photocatalytic samples in the laboratory and in situ. We demonstrate how the Rz ink can be used to assess the activities of both UV and Visible light absorbing photocatalytic powders and thin films, and highly colored samples. The kinetics of the photocatalyzed color change are outlined, which are zero-order with respect to the initial dye concentration and ink film thickness. We describe the basic features of the recently published Rz-ink based ISO for the qualitative and quantitative assessment of activity of nonporous, flat photocatalytic films. Although the Rz ink is best suited for assessing films of moderate photocatalytic activity, such as found in most examples of commercial self-cleaning glass, other paiis are described which can be used to assess commercial products that have much higher or lower, activities, such as photocatalytic paints and tiles, respectively. Examples of how paiis have been used in research over recent years are given, a highlight of which is their use in the search for a suitable, visible light absorbing photocatalyst alternative to TiO2, that can compete with the latter in terms of cost, durability, stability, and activity. Finally, the novel, photocatalyst-based inks that have been developed as a consequence of the works on paiis are discussed briefly, inclu...

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Section: Applications Of Paiismentioning

confidence: 83%

Photocatalyst Activity Indicator Inks, paiis, for Assessing Self-Cleaning Films

2021

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“…In one such example, tungsten-doped TiO 2 nanoparticles incorporated into a coating for medium-density fiberboards showed higher activity in NOx degradation than commercial products. 70 …”

Section: Introductionmentioning

confidence: 99%

“…In one such example, tungsten-doped TiO 2 nanoparticles incorporated into a coating for medium-density fiberboards showed higher activity in NOx degradation than commercial products. 70 Over the years, the development of paints moved toward using waterborne formulations instead of traditional organic solvent-borne options. These are safer for the environment and have less odor.…”

Section: Introductionmentioning

confidence: 99%

Using visible light to activate antiviral and antimicrobial properties of TiO2 nanoparticles in paints and coatings: focus on new developments for frequent-touch surfaces in hospitals

et al. 2023

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The COVID-19 pandemic refocused scientists the world over to produce technologies that will be able to prevent the spread of such diseases in the future. One area that deservedly receives much attention is the disinfection of health facilities like hospitals, public areas like bathrooms and train stations, and cleaning areas in the food industry. Microorganisms and viruses can attach to and survive on surfaces for a long time in most cases, increasing the risk for infection. One of the most attractive disinfection methods is paints and coatings containing nanoparticles that act as photocatalysts. Of these, titanium dioxide is appealing due to its low cost and photoreactivity. However, on its own, it can only be activated under high-energy UV light due to the high band gap and fast recombination of photogenerated species. The ideal material or coating should be activated under artificial light conditions to impact indoor areas, especially considering wall paints or frequent-touch areas like door handles and elevator buttons. By introducing dopants to TiO 2 NPs, the bandgap can be lowered to a state of visible-light photocatalysis occurring. Naturally, many researchers are exploring this property now. This review article highlights the most recent advancements and research on visible-light activation of TiO 2 -doped NPs in coatings and paints. The progress in fighting air pollution and personal protective equipment is also briefly discussed. Graphical Abstract Indoor visible-light photocatalytic activation of reactive oxygen species (ROS) over TiO 2 nanoparticles in paint to kill bacteria and coat frequently touched surfaces in the medical and food industries.

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“…In addition, Jeyaraj et al [6] found that the amount of particle reinforcement and its distribution homogeneity plays a vital role in the functional properties of the composite coating. The different nano particles used in the Ni matrix coating are SiC [5,7], Al 2 O 3 [8], ZrO 2 [9], TiO 2 [10,11], SiO 2 [12], B 4 C [13], Si 3 N 4 [14], CNT [15], TiC [16], diamond like carbon (DLC) [17], etc. The enhanced properties and low cost of Al 2 O 3 particles in Ni matrix coating made it more popular.…”

Section: Introductionmentioning

confidence: 99%

Wear behaviour of different nano particles coating on Al6061 substrate

Raghavendra¹

2023

Surface Engineering

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The tribological behaviour of Ni-based composite coatings on Al6061 substrate with secondary phase hard oxide particles like ZrO 2 , TiO 2 , and Al 2 O 3 at different elevated temperature conditions was compared. The composite coatings with different reinforcement of nano particles were characterized by scanning electron microscopy and X-ray diffraction technique. The higher microhardness value is reported for the Ni coating with TiO 2 particles and Al 2 O 3 particles. At higher temperature limits of 120°C and 140°C Ni-ZrO 2 coatings have found better specific wear rate. The Ni-Al 2 O 3 -TiO 2 -ZrO 2 composite coating fails to achieve better properties due to higher agglomeration of the particles and dendrite growth. The Ni-Al 2 O 3 coating showed steady wear behaviour at different temperature limits. The coefficient of friction values is found nearly similar for all the type coatings at 40°C and 120°C.

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UV / visible sol gel W–TiO2 photocatalytic coatings for interior building surfaces

Cited by 10 publications

References 87 publications

Photocatalyst Activity Indicator Inks, paiis, for Assessing Self-Cleaning Films

Photocatalyst Activity Indicator Inks, paiis, for Assessing Self-Cleaning Films

Using visible light to activate antiviral and antimicrobial properties of TiO2 nanoparticles in paints and coatings: focus on new developments for frequent-touch surfaces in hospitals

Wear behaviour of different nano particles coating on Al6061 substrate

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