N and N,S-doped TiO2 photocatalysts and their activity in NOx oxidation

Todorova, N.; Vaimakis, T.; Petrakis, Dimitrios; Hishita, Shunichi; Boukos, N.; Giannakopoulou, T.; Giannouri, M.; Antiohos, S.K.; Papageorgiou, Dimitris; Chaniotakis, Emmanouil; Trapalis, C.

doi:10.1016/j.cattod.2012.11.019

Cited by 56 publications

(27 citation statements)

References 31 publications

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“…The hematite sample remained active towards the photochemical process whereas the titanium dioxide was inert. Under similar conditions (visible-light irradiation with > 510 nm), the NO X removal efficiency of N-and S-doped TiO 2 systems was around 12% [28,29], and only high and interesting values (>35% PCO efficiency) were obtained through the use of platinum, a very expensive metal, as dopant element [28,31] or by using N-F-as co-dopants [72].…”

Section: C-fe 2 O 3 Samples and No X Removalmentioning

confidence: 95%

“…The use of photochemical oxidation (PCO)-assisted processes has gained great attention by researchers in Accordingly, in recent years, the research community has begun to devote attention to the study of visible-light photocatalytic materials for this application. Nowadays, this interesting area of research is emerging and only a few materials have been reported: Bi 2 WO 6 , BiOBr, Bi 2 Mo 3 O 12 , InVO 4 , In(OH) x S y , SrTiO 3 , N-TiO 2 , N,STiO 2 , Au-TiO 2 and PtO x -TiO 2 [22][23][24][25][26][27][28][29][30][31]. Bearing in mind that the future implementation of De-NO X materials in our cities would be a large-scale operation, the lowest cost materials must be considered.…”

Section: Introductionmentioning

confidence: 99%

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Efficient behaviour of hematite towards the photocatalytic degradation of NO gases

Sugrañez

Balbuena

Cruz-Yusta

et al. 2015

Applied Catalysis B: Environmental

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Section: C-fe 2 O 3 Samples and No X Removalmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Efficient behaviour of hematite towards the photocatalytic degradation of NO gases

Sugrañez

Balbuena

Cruz-Yusta

et al. 2015

Applied Catalysis B: Environmental

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“…When the amount of NO 2 is very high, the equation reacts as shown below: (5) 2NO2 + 2NaOH ↔ NaNO2 + NaNO3 + H2O…”

Section: Effect Of Initial Concentration and Sodium Hydroxide Solutiomentioning

confidence: 99%

“…Main methods of controlling the NO x are composed of selective and non-selective catalytic reduction, less excess air, recycling of combustion gasses, NO x chemical reduction, NO x oxidation, and absorption in liquids (4)(5)(6). Using the methods to prevent NO x generation is mostly applied (while combustion) by changing the limited production processes.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Photocatalytic Oxidation and Wet Absorption in a Combined System for Removal of Nitrogen Oxides

2016

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Background: One of the important achievements of the past decade was the rapid growth of industries and accordingly production of various chemical compounds.Objectives: This study presents a combined system of photocatalytic oxidation and absorption solution to remove nitrogen oxides from polluted air flow. Materials and Methods:The experimental system used in this study comprised a pollutant gas source, mixing chamber, photocatalytic oxidation reactor, wet absorption system, and finally a system for measuring nitrogen oxides. Firstly, by using photocatalytic property, nitrogen oxide was converted to nitrogen dioxide. Then, absorption system was used to absorb nitrogen dioxide into the sodium hydroxide solution. Results: Experimental results have shown that output of nitrogen oxide removal in the initial concentration of 200 ppm was 44% in the beginning of the process and then fixed at 15% during the rest of the process. Also, by changing the amount of zinc oxide nanoparticles from 4 to 8 mg/cm 2 , no considerable change was observed in the conversion rate of nitrogen oxide. In addition, while

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“…Until now, the adjusting of the electronic structure of TiO 2 materials is an effective approach, for example, substituting lattice oxygen with nonmetal elements such as C, N, S, F, Cl, or I (Han et al 2014;Huang and Wey 2013;Umadevi et al 2014;Vereb et al 2013;Wang et al 2009). It was reported that co-doped TiO 2 with two or more nonmetal elements, such as C-N (Cong et al 2006;Dolat et al 2012;Ruzybayev and Shah 2014;Wang and Lim 2011;Wu and Ju 2014;Xu et al 2011;Yang et al 2008;Zhang and Song 2009), S-N (Todorova et al 2013), N-F and C-S (Scarisoreanu et al 2014) can further exhibit synergistic effect of increasing the visible-light activities. Among them, C and N co-doping onto TiO 2 has shown to have superior photocatalytic performance under visible light (Chen et al 2007a) because of its large specific surface area and developed porosity favors solar energy conversion.…”

Section: Introductionmentioning

confidence: 98%

Alcohol solvents evaporation-induced self-assembly synthesis of mesoporous TiO2−x−y C x N y nanoparticles toward visible-light driven photocatalytic activity

Liu

Syu

2014

J Nanopart Res

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A one-step solvent evaporation-induced self-assembly (SEISA) process was demonstrated to prepare carbon and nitrogen co-doping mesoporous TiO 2 nanoparticles (MesoTiO 2-x-y C x N y -S) using an ionic liquid as carbon and nitrogen sources as well as mesoporous template. After the evaporation of different solvents (methanol, ethanol, and isopropanol) and subsequent calcinations at 773 K, the obtained Meso TiO 2-x-y C x N y -S samples were systematically characterized by a variety of spectroscopic and analytical techniques, including small-and large-angle X-ray diffraction (XRD), Raman, transmission electron microscopy (TEM), N 2 adsorption-desorption isotherms, Fourier transform infrared (FTIR), and X-ray photoelectron (XPS) spectroscopies. The results indicate that the solvents play an essential role on the chemical microstructure, doping elemental states, and photocatalytic performance of catalysts. The MesoTiO 2-x-y C x N y -I samples have the lowest band gap of ca. 2.75 eV and strongest absorbance of visible light in the range of 400-600 nm. Among the MesoTiO 2-x-y C x N y -S photocatalysts, the MesoTiO 2-x-y C x N y -M catalysts show superior photocatalytic activity of hydrogen generation in methanol aqueous solution under visible light irradiation as compared to MesoTiO 2-x-y C x N y -E, MesoTiO 2-x-y C x N y -I, and commercial Degussa TiO 2 . This result could be attributed to the moderate C,N co-doping amounts on their developed mesoporous texture (pore size = 8.0 nm) and high surface area (107 m 2 g -1 ) of TiO 2 (crystallite size = 9.9 nm) in the MesoTiO 2-x-y C x N y -M catalysts.

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N and N,S-doped TiO2 photocatalysts and their activity in NOx oxidation

Cited by 56 publications

References 31 publications

Efficient behaviour of hematite towards the photocatalytic degradation of NO gases

Efficient behaviour of hematite towards the photocatalytic degradation of NO gases

Investigation of Photocatalytic Oxidation and Wet Absorption in a Combined System for Removal of Nitrogen Oxides

Alcohol solvents evaporation-induced self-assembly synthesis of mesoporous TiO2−x−y C x N y nanoparticles toward visible-light driven photocatalytic activity

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