Hydroxyapatite/titanium dioxide nanocomposites for controlled photocatalytic NO oxidation

Mitsionis, Anastasios; Vaimakis, T.; Trapalis, C.; Todorova, N.; Bahnemann, Detlef W.; Dillert, Ralf

doi:10.1016/j.apcatb.2011.05.047

Cited by 90 publications

(50 citation statements)

References 46 publications

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“…Photocatalytic systems offer promising opportunities in order to tackle this important environmental challenge, as these systems can be tailored to efficiently clean/purify air under ambient conditions with the help of ultraviolet (UV) and/or visible (VIS) light [13]. Among these systems TiO 2 -based materials are the most effective photocatalysts for air/water purification applications [14,15]. However it has been reported that complete photocatalytic reduction of toxic NO x species into harmless N 2 occurs only with a relatively limited performance for these systems [13].…”

Section: Introductionmentioning

confidence: 99%

TiO2–Al2O3 binary mixed oxide surfaces for photocatalytic NOx abatement

Soylu

Polat

Erdogan

et al. 2014

Applied Surface Science

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a b s t r a c tTiO 2 -Al 2 O 3 binary oxide surfaces were utilized in order to develop an alternative photocatalytic NO x abatement approach, where TiO 2 sites were used for ambient photocatalytic oxidation of NO with O 2 and alumina sites were exploited for NO x storage. Chemical, crystallographic and electronic structure of the TiO 2 -Al 2 O 3 binary oxide surfaces were characterized (via BET surface area measurements, XRD, Raman spectroscopy and DR-UV-Vis Spectroscopy) as a function of the TiO 2 loading in the mixture as well as the calcination temperature used in the synthesis protocol. 0.5 Ti/Al-900 photocatalyst showed remarkable photocatalytic NO x oxidation and storage performance, which was found to be much superior to that of a Degussa P25 industrial benchmark photocatalyst (i.e. 160% higher NO x storage and 55% lower NO 2 (g) release to the atmosphere). Our results indicate that the onset of the photocatalytic NO x abatement activity is concomitant to the switch between amorphous to a crystalline phase with an electronic band gap within 3.05-3.10 eV; where the most active photocatalyst revealed predominantly rutile phase together and anatase as the minority phase.

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Section: Introductionmentioning

confidence: 99%

TiO2–Al2O3 binary mixed oxide surfaces for photocatalytic NOx abatement

Soylu

Polat

Erdogan

et al. 2014

Applied Surface Science

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“…The amount of Å OH in the reaction system was determined by fluorescence spectrophotometer analysis method with terephthalic acid (TPA) capture [28,29]. Four mL of TPA solution (0.2 mol/L, dissolved in 0.5 mol/L NaOH solution) as trapping agent was added in the reaction solution.…”

Section: Determination Of å Oh In the Reaction Systemmentioning

confidence: 99%

Highly active magnetic bismuth tungstate/magnetite composite under visible light irradiation in the presence of hydrogen peroxide

Shan

Chu

et al. 2015

Journal of Colloid and Interface Science

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“…The band gap of HAp was reported in [5] to be 3.95 eV by photoluminescence measurement, meanwhile, in some papers, that of HAp was calculated to be around 4.51-5.4 eV [6,7]. The band gap of TiO 2 /HAp composites calculated by UV-Vis diffuse reflectance spectra was between 3.06 and 3.08 eV while that of pure TiO 2 was broader (3.12 eV) [8]. However, the band gap of Tisubstituted hydroxyapatite evaluated by both experimental and theoretical methods was 3.65 eV [9].…”

Section: Introductionmentioning

confidence: 99%

The Shifts of Band Gap and Binding Energies of Titania/Hydroxyapatite Material

Linh

Tuấn

Dzung

2014

Journal of Composites

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The titania/hydroxyapatite (TiO 2 /HAp) product was prepared by precipitating hydroxyapatite in the presence of TiO(OH) 2 gel in the hydrothermal system. The characteristics of the material were determined by using the measurements such as X-ray photoemission spectroscopy (XPS), X-ray diffraction (XRD), diffuse reflectance spectra (DRS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and energy dispersive X-ray (EDX). The XPS analysis showed that the binding energy values of Ca (2p1/2, 2p3/2), P (2p1/2, 2p3/2), and O 1s levels related to hydroxyapatite phase whereas those of Ti (2p3/2, 2p1/2) levels corresponded with the characterization of titanium (IV) in TiO 2 . The XRD result revealed that TiO 2 /HAp sample had hydroxyapatite phase, but anatase or rutile phases were not found out. TEM image of TiO 2 /HAp product showed that the surface of the plate-shaped HAp particles had a lot of smaller particles which were considered as the compound of Ti. The experimental band gap of TiO 2 /HAp material calculated by the DRS measurement was 3.6 eV, while that of HAp pure was 5.3 eV and that of TiO 2 pure was around 3.2 eV. The shift of the band gap energy of TiO 2 in the range of 3.2-3.6 eV may be related to the shifts of Ti signals of XPS spectrum.

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Hydroxyapatite/titanium dioxide nanocomposites for controlled photocatalytic NO oxidation

Cited by 90 publications

References 46 publications

TiO2–Al2O3 binary mixed oxide surfaces for photocatalytic NOx abatement

TiO2–Al2O3 binary mixed oxide surfaces for photocatalytic NOx abatement

Highly active magnetic bismuth tungstate/magnetite composite under visible light irradiation in the presence of hydrogen peroxide

The Shifts of Band Gap and Binding Energies of Titania/Hydroxyapatite Material

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