A quick assessment of the photocatalytic activity of TiO2 pigments — From lab to conservation studio!

Driel, B.A. van; Kooyman, Patricia J.; Berg, Klaas Jan van den; Schmidt‐Ott, A.; Dik, Joris

doi:10.1016/j.microc.2015.11.048

Cited by 91 publications

(69 citation statements)

References 23 publications

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“…1, confirms that uncoated anatase (photocatalytic) and inorganically coated rutile (photostable), behave completely differently regarding gloss decay under UV irradiation [1,2,4,5,[23][24][25], which validates their use as photocatalytic and photostable references. Furthermore, we previously showed the order of the photocatalytic activity of the TiO 2 powders to be UA > CA(org) > CR(org) > CR(inorg) [5]. This is also found in experiment I, underlining the predictive value of the previously published photocatalytic activity test [5].…”

Section: Experiments I: the Effect Of Different Tio 2 Pigmentsmentioning

confidence: 66%

“…In all runs, the same pigment content (15% v/v) was added to linseed oil ("Paint preparation" section) to reach workable paints with the different types of titanium white pigments. Prior knowledge of the pigments characteristics, specifically their crystal structure and the presence of a coating, as well as previous results from photocatalytic activity experiments [4,5], were used to code the pigment type. From A to E the pigments are ranked in the following order from photostable to highly photocatalytic: CR(inorg), CA(inorg), CR(org), CA(org), UA.…”

Section: Experiments I: the Effect Of Different Tio 2 Pigmentsmentioning

confidence: 99%

“…Especially the early pigments exhibited undesirably high photocatalytic activity [4,5]. The photocatalytic activity of titanium white pigments can lead to several degradation phenomena, such as the breakdown of the binding medium leading to chalking, or the degradation of colored pigments [1,6,7].…”

Section: Introductionmentioning

confidence: 99%

“…In case of photocatalytic TiO 2 (nano)powders, powder characteristics such as particle size, surface area, or doping differently influence the photocatalytic activity of the different polymorphs [21,22]. However, for pigments, the crystal structure and the inorganic coating are the most important characteristics influencing photocatalytic activity [5]. Uncoated anatase pigments have the highest photocatalytic activity, while inorganically coated rutile pigments are relatively photostable and even photoprotective [1,4,5,[23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…However, for pigments, the crystal structure and the inorganic coating are the most important characteristics influencing photocatalytic activity [5]. Uncoated anatase pigments have the highest photocatalytic activity, while inorganically coated rutile pigments are relatively photostable and even photoprotective [1,4,5,[23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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Investigating the effect of artists’ paint formulation on degradation rates of TiO2-based oil paints

et al. 2018

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This study reports on the effect of artists' paint formulation on degradation rates of TiO 2 -based oil paints. Titanium white oil paint exists in a multitude of different recipes, and the effect of the formulation on photocatalytic binder degradation kinetics is unknown. These formulations contain, among others, one or both titanium dioxide polymorphs, zinc oxide, the extenders barium sulfate or calcium carbonate and various additives. Most research performed on the photocatalytic degradation process focusses on pure titanium white-binder mixtures and thus does not take into account the complete paint system. Since photocatalytic oil degradation is a process initiated by the absorption of UV light, any ingredient or combination of ingredients influencing the light scattering and absorption properties of the paint films may affect the degradation rate. In this study three sets of experiments are conducted, designed using the design of experiments (DoE) approach, to screen for the most important formulation factors influencing the degradation rate. The benefits of using DoE, compared to a more traditional 'one factor at a time approach' are robustness, sample efficiency, the ability of evaluate mixtures of multiple components as well as the ability to evaluate factor interactions. The three sets of experiments investigate (1) the influence of the TiO 2 type, (2) the impact of different mixtures of two types of TiO 2 , ZnO and the additive aluminum stearate and (3) the influence of common extenders in combination with photocatalytic TiO 2 , on the photocatalytic degradation of the oil binder. The impact of the formulation on the degradation rate became apparent, indicating the shortcoming of oversimplified studies. The protective effect of photostable TiO 2 pigments, even in a mixture with photocatalytic TiO 2 pigments, as well as the negative effect of extenders was demonstrated. Furthermore, the ambiguous role of ZnO (photocatalytic or not) and aluminum stearate is highlighted. Neither can be ignored in a study of degradation behavior of modern oil paints and require further investigation.

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Section: Experiments I: the Effect Of Different Tio 2 Pigmentsmentioning

confidence: 66%

Section: Experiments I: the Effect Of Different Tio 2 Pigmentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigating the effect of artists’ paint formulation on degradation rates of TiO2-based oil paints

et al. 2018

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Photonic Whitener Pigments: A Sustainable Alternative to Titanium Dioxide Nanoparticles

Safari,

Wang,

Schreur‐Piet

et al. 2024

Advanced Optical Materials

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Titanium dioxide is the world's most widely used pigment; however, increased cost and potential environmental concerns have driven a need for a sustainable replacement. The study has developed a scalable method to produce more sustainable photonic whiteners with application in paint and other dispersion formulations. Bio‐resourced zein protein nanoparticles are synthesized and used as sacrificial templates within a silica matrix. These micron‐sized photonic whiteners exhibit morphologically dependent whitening capabilities when incorporated into paint films. When the silica content is insufficient, an open structure forms, while an excess of silica content results in fewer interfaces and reduced scattering efficiency, leading to suboptimal whitening performance. An ideal ratio of silica to zein nanoparticles ensures optimal whitening properties comparable to commercially available whitener alternatives to titanium dioxide. Further analysis reveals a non‐uniform internal morphology of the photonic whiteners, with a silica‐void network dispersed within a solid silica matrix. This morphology provides an innovative criterion for optimizing the whitening performance of photonic structures beyond composition.

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Optimization of Photocatalytic Degradation of Rhodamine B and Indigo Carmine Dyes Using Eco‐Friendly Kaolinite‐Silver Oxide Quantum Dots Nanocomposite Under Sunlight Irradiation

Awad,

Farrag,

Aboelnga

et al. 2024

Applied Organom Chemis

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In this work, we present a simple method for the pyrofabrication of a new kaolinite‐ silver oxide quantum dots nanocomposite (Kao‐Ag2O/QDs) that is used for the degradation of rhodamine B (RhB) and indigo carmine (IC) dyes. A homogenous combination of kaolinite and silver nitrate was sintered up to 350 °C to create the extremely effective photocatalyst (Kao‐Ag2O/QDs). Various analytical techniques were employed to characterize the Kao‐Ag2O/QDs photocatalyst such as XRD, FTIR, XPS, SEM–EDX, TEM, DTA/TGA, ZP, BET, and UV–Vis DRS. The degradation of RhB and IC dyes through the photocatalyst was carried out in aqueous solutions utilizing several pH dye solutions and sustainable solar energy in atmosphere conditions. The nanocomposite that was prepared had shown an enhanced specific surface area of 53.3005 m2/g, a pore size of 8.1197 nm, and a total pore volume of 0.216 cm3/g. It also displayed an optical band gap energy of 2.9 eV. The study creates that employing the ideal dose of 2000 and 1500 mg/L of the Kao‐Ag2O/QDs photocatalyst at neutral conditions (pH = 7) resulted a maximum degradation effectiveness of RhB and IC of 91.06 and 93.46% after 90 min, respectively. RhB and IC dyes degradation followed Langmuir first‐order kinetics with a rate constant of 0.0217 and 0.0216 min−1 at pH = 7, respectively. The photocatalytic degradation activity for RhB dye is based on hydroxyl radicals (˙OH) and superoxide radicals (˙O2−), while the mechanism of IC removal is based on superoxide radicals (˙O2−), as revealed by scavenger‐based radical trapping studies. A triple reusability study found that the Kao‐Ag2O photocatalyst is highly stable with degradation efficiencies of RhB and IC dyes from the initial 91.09 to 90.04, 88.54, and 86.27% and from the initial 93.46 to 92.8, 91.4 and 89.32%, respectively. The optimal situations for the parameters were identified by the Box–Behnken design (BBD), which was well matched with photocatalytic degradation tests.

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A quick assessment of the photocatalytic activity of TiO2 pigments — From lab to conservation studio!

Cited by 91 publications

References 23 publications

Investigating the effect of artists’ paint formulation on degradation rates of TiO2-based oil paints

Investigating the effect of artists’ paint formulation on degradation rates of TiO2-based oil paints

Photonic Whitener Pigments: A Sustainable Alternative to Titanium Dioxide Nanoparticles

Optimization of Photocatalytic Degradation of Rhodamine B and Indigo Carmine Dyes Using Eco‐Friendly Kaolinite‐Silver Oxide Quantum Dots Nanocomposite Under Sunlight Irradiation

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