Photocatalytic activity of electrophoretically deposited (EPD) TiO2 coatings

Nuño, Manuel; Ball, Richard; Bowen, Chris R.; Kurchania, Rajnish; Sharma, Ganesh D.

doi:10.1007/s10853-015-9022-0

Cited by 38 publications

(14 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…To assess the photocatalytic activity of TiO 2 powders in the gas phase, a mass spectrometer was employed due to its ability to monitor a range of species simultaneously. The system has been reported previously in detail [14][15][16], including the ionic species and corresponding masses commonly formed in the gas phase [15]. A schematic diagram of the system is shown in Figure 1.…”

Section: Photocatalytic Degradation Of Gaseous Pollutantsmentioning

confidence: 99%

Photocatalytic Properties of Commercially Available TiO2 Powders for Pollution Control

Nuño¹,

Ball²,

Bowen³

2016

Semiconductor Photocatalysis - Materials, Mechanisms and Applications

Self Cite

View full text Add to dashboard Cite

The photocatalytic properties of titanium dioxide have been widely studied over recent decades since the discovery of water photolysis by TiO 2 electrodes in 1972. Titanium dioxide has three main crystal polymorphs; anatase, rutile and brookite and rutile is the most common as the metastable polymorph. Each polymorph has different band gap positions. Anatase's band gap is 3.2 eV, higher than rutile's which is 3.0 eV. This difference in the band gap will determine their optimum UV wavelength range to promote a photocatalytic process. There are different methods to assess the photocatalytic activity of a material. The most commonly used method is the degradation of a dye in aqueous solution under UV light, due to its simplicity. Under these conditions the decomposition rate of a suitable organic dye is used as a measure of activity. Physical properties such as particle size and surface area will determine the effective area that will interact and absorb the dye prior to degradation. The physical mechanisms involved in such aqueous based methods differ from gas phase reactions. More advanced techniques use mass spectrometers to evaluate photocatalytic activity of titanium dioxide in the gas phase. An effective photocatalyst for heterogeneous reactions in the gas phase is one which is efficient at creating radicals as a result of an absorbed photon.

show abstract

Section: Photocatalytic Degradation Of Gaseous Pollutantsmentioning

confidence: 99%

Photocatalytic Properties of Commercially Available TiO2 Powders for Pollution Control

Nuño¹,

Ball²,

Bowen³

2016

Semiconductor Photocatalysis - Materials, Mechanisms and Applications

Self Cite

View full text Add to dashboard Cite

show abstract

“…Anatase is one of the polymorphs and is widely studied for its photocatalytic properties when exposed to UV radiation. Previous researchers have investigated the use of titanium dioxide and its photocatalytic reactions in a wide range of applications such as water treatment [12][13][14], air purification [15][16][17][18][19] self-cleaning surfaces [20][21][22][23][24][25][26] or for the development of new super hydrophilic surfaces [21].…”

Section: Titanium Dioxide and Photocatalysismentioning

confidence: 99%

Environmental performance of nano-structured Ca(OH)2/TiO2 photocatalytic coatings for buildings

Nuño

Pesce

Bowen

et al. 2015

Building and Environment

Self Cite

View full text Add to dashboard Cite

This paper describes the environmental performance of a mixed phase coating (photocatalytic nanolime) manufactured from a colloidal nano-structured calcium hydroxide in alcohol (nanolime) combined with titanium dioxide. While nanolime is used as a consolidant in the field of cultural heritage and titanium dioxide is used as a photocatalytic material for self-cleaning coatings and environmental pollution control within the construction industry both materials are often used separately. We report in this paper an approach to combine both materials for the development of a photocatalytic nanolime coating. The photocatalytic effect of titanium dioxide on the carbonation of nanolime and its influence on the degradation processes in polluted environments is explored. A suspension of 25g/l of nanolime in ethanol and 7.4% wt/vol titanium dioxide was applied to specimens of Bath stone. For comparison, additional specimens were treated only with the nanolime.The specimens were exposed to oxides of nitrogen and sulphur under 30% relative humidity (RH) for 120 hours. Exposure was carried out under both, UV and daylight. After exposure, the effect of titanium dioxide on the carbonation of nanolime and on the degradation processes was investigated using scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDS) and X-ray photo electron spectroscopy (XPS). Results were evaluated considering the dissolution processes of the two oxides in water, and modelled using PHREEQC. Results show that the nanolime and the photocatalytic nanolime coatings promote the reaction of SO 2 . In addition, the photocatalytic effect of the anatase form of titanium dioxide promotes the formation of a surface layer of calcium sulphate and inhibits carbonation of calcium hydroxide. That was attributed to the oxidation of sulphur dioxide to sulphur trioxide by hydroxyl radicals which led to the formation of sulphuric acid.

show abstract

“…The representative materials that can reduce secondary sources through chemical reactions are TiO 2 photocatalysts. They can achieve self-cleaning [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ], antibacterial resistance [ 16 ], air-cleaning, deodorization [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ], and water-purification [ 23 , 24 , 25 , 26 , 27 ] effects by absorbing light in the 350–380 nm range of the wavelengths of light. Among them, air cleaning was used in this study because it can remove the cause of PM generation by oxidizing NO x .…”

Section: Introductionmentioning

confidence: 99%

NOx-Reduction Performance Test for TiO2 Paint

et al. 2020

View full text Add to dashboard Cite

In South Korea, the gradual increase in particulate matter generation has received significant attention from central and local governments. Exhaust gas, which contains nitrogen oxides (NOx), is one of the main sources of particulate matter. In this study, the reduction of NOx using a coating material mixed with a titanium dioxide (TiO2) photocatalyst was demonstrated. The NOx reduction performance of the TiO2 photocatalyst-infused coating was evaluated by applying the ISO 22197-1 2007 standard. Subsequently, the performance was evaluated by changing the NO gas concentration and ultraviolet (UV)-A irradiance under standard experimental conditions. It was determined that NOx reduction can be achieved even if the NO gas concentration and UV-A irradiance are lower than those under the standard conditions when the TiO2 photocatalyst-infused coating was used. This study revealed that NOx reduction can be realized through TiO2 photocatalyst-infused coating in winter or cloudy days with a low solar altitude. It was also confirmed that compared with the UV-A irradiance, the NO gas concentration has a greater effect on the NOx reduction performance of the TiO2 photocatalyst-infused coating. These findings can be used to evaluate a variety of construction materials with TiO2 photocatalysts in the future.

show abstract

Photocatalytic activity of electrophoretically deposited (EPD) TiO2 coatings

Cited by 38 publications

References 53 publications

Photocatalytic Properties of Commercially Available TiO2 Powders for Pollution Control

Photocatalytic Properties of Commercially Available TiO2 Powders for Pollution Control

Environmental performance of nano-structured Ca(OH)2/TiO2 photocatalytic coatings for buildings

NOx-Reduction Performance Test for TiO2 Paint

Contact Info

Product

Resources

About