Photocatalytic oxidation of NO x gases using TiO 2 : a surface spectroscopic approach

Dalton, James S.; Janes, PA; Jones, N.G.; Nicholson, John; Hallam, K; Allen, GC

doi:10.1016/s0269-7491(02)00107-0

Cited by 356 publications

(207 citation statements)

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“…In previous studies, HONO (Gustafsson et al, 2006;Ndour et al, 2008;Monge et al, 2010;Beaumont et al, 2009) and NO (Ohko et al, 2008;Monge et al, 2010) in the gas phase as well as nitric acid/nitrate anion on the surface (e.g. Dalton et al, 2002;Devahasdin et al, 2003;Lin et al, 2006;Ndour et al, 2008;Negishi et al, 1998;Ohko et al, 2008) were observed as the NO 2 + TiO 2 reaction products. In the present study we have observed HONO, NO and, in addition, N 2 O to be released into the gas phase as a result of the heterogeneous reaction of NO 2 with TiO 2 surface.…”

Section: Discussionmentioning

confidence: 95%

“…Henderson, 2011). In addition, TiO 2 is known to transform nitrogen oxides (NO/NO 2 ), via catalytic heterogeneous reactions, to HNO 3 , which remains on the TiO 2 surface (Ibusuki and Takeuchi, 1994;Dalton et al, 2002;Devahasdin et al, 2003;Negishi et al, 1998;Ohko et al, 2008). Due to these photocatalytic properties TiO 2 is widely used in a variety of so-called de-polluting building materials aimed to remove the nitrogen oxides from the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

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Interaction of NO2 with TiO2 surface under UV irradiation: measurements of the uptake coefficient

Zein

Bedjanian

2012

Atmos. Chem. Phys.

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Abstract. The interaction of NO 2 with TiO 2 solid films was studied under UV irradiation using a low pressure flow reactor (1-10 Torr) combined with a modulated molecular beam mass spectrometer for monitoring of the gaseous species involved. The NO 2 to TiO 2 reactive uptake coefficient was measured from the kinetics of NO 2 loss on TiO 2 coated Pyrex rods as a function of NO 2 concentration, irradiance intensity (J NO 2 = 0.002-0.012 s −1 ), relative humidity (RH = 0.06-69 %), temperature (T = 275-320 K) and partial pressure of oxygen (0.001-3 Torr). TiO 2 surface deactivation upon exposure to NO 2 was observed. The initial uptake coefficient of NO 2 on illuminated TiO 2 surface (with 90 ppb of NO 2 and J NO 2 ∼ =0.006 s −1 ) was found to be γ 0 = (1.2±0.4) ×10 −4 (calculated using BET surface area) under dry conditions at T = 300 K. The steady state uptake, γ , was several tens of times lower than the initial one, independent of relative humidity, and was found to decrease in the presence of molecular oxygen. In addition, it was shown that γ is not linearly dependent on the photon flux and seems to level off under atmospheric conditions. Finally, the following expression for γ was derived, γ = 2.3×10 −3 exp(-1910/T)/(1 + P 0.36 ) (where P is O 2 pressure in Torr), and recommended for atmospheric applications (for any RH, near 90 ppb of NO 2 and J NO 2 = 0.006 s −1 ).

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Interaction of NO2 with TiO2 surface under UV irradiation: measurements of the uptake coefficient

Zein

Bedjanian

2012

Atmos. Chem. Phys.

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“…This process involves a solid semiconductor catalyst, most often anatase titanium dioxide (TiO 2 ), which is activated with ultraviolet light of the appropriate wavelength. To date, a number of researchers have investigated the dynamics of the photocatalysis of nitrogen oxides [2][3][4][5][6][7][8]. Photocatalytic oxidation of NO x offers the following distinctive advantages: (1) no extra reactants are required and (2) NO x is converted to nitrates, a significantly less harmful material.…”

Section: Introductionmentioning

confidence: 99%

Full scale demonstration of air-purifying pavement

Ballari

Brouwers

2013

Journal of Hazardous Materials

142

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“…What is more, TiO 2 catalysts are being used for the decomposition of nitrogen oxides in the air (Dalton et al 2002, Ao et al 2003, Maggos et al 2007. This effect is achieved by the addition of TiO 2 to exterior house paint, building materials or self-cleaning plate glass (Langridge et al 2009, O'Keeffe et al 2013).…”

Section: Titanium In the Industrymentioning

confidence: 99%

Titanium compounds and their impact on the transformation of air pollutants

Bok¹,

Bożym²

2015

geol

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Titanium, as a transition metal, demonstrates a high mechanical strength. It is light and corrosion resistant. The estimation of the environmental impact of the use of machine parts that grains are freed from and contact the surface of titanium alloys by wear is buffing. Due to its catalytic action, TiO 2 is nowadays added to asphalt, concrete, exterior paints for elevation, self-cleaning glass and protective coatings. It is also present in clothes, food (E171), cosmetics (CI 77891) and textiles. The research on the toxicity of titanium and its compounds points towards their neutral character, however an adverse impact is also observed in nature. TiO 2 may affect air quality. It promotes free radicals and ozone origination. The properties and direction of the use of titanium compounds and their influence on the circulation of pollutants are described below.

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Photocatalytic oxidation of NO x gases using TiO 2 : a surface spectroscopic approach

Cited by 356 publications

References 10 publications

Interaction of NO<sub>2</sub> with TiO<sub>2</sub> surface under UV irradiation: measurements of the uptake coefficient

Interaction of NO<sub>2</sub> with TiO<sub>2</sub> surface under UV irradiation: measurements of the uptake coefficient

Full scale demonstration of air-purifying pavement

Titanium compounds and their impact on the transformation of air pollutants

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Photocatalytic oxidation of NO x gases using TiO 2 : a surface spectroscopic approach

Cited by 356 publications

References 10 publications

Interaction of NO&lt;sub&gt;2&lt;/sub&gt; with TiO&lt;sub&gt;2&lt;/sub&gt; surface under UV irradiation: measurements of the uptake coefficient

Interaction of NO&lt;sub&gt;2&lt;/sub&gt; with TiO&lt;sub&gt;2&lt;/sub&gt; surface under UV irradiation: measurements of the uptake coefficient

Full scale demonstration of air-purifying pavement

Titanium compounds and their impact on the transformation of air pollutants

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Product

Resources

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Interaction of NO<sub>2</sub> with TiO<sub>2</sub> surface under UV irradiation: measurements of the uptake coefficient

Interaction of NO<sub>2</sub> with TiO<sub>2</sub> surface under UV irradiation: measurements of the uptake coefficient