Bifunctional N-Doped Mesoporous TiO<sub>2</sub> Photocatalysts

Fang, Jun; Wang, Fang; Qian, Kun; Bao, Huizhi; Jiang, Zhiquan; Huang, Weixin

doi:10.1021/jp805926b

Cited by 167 publications

(108 citation statements)

References 40 publications

(111 reference statements)

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“…The first edge is related to the band structure of the original titania and its wavelength position usually does not change significantly with nitrogen doping; the second edge extends into the visible region and is related to the new band created by nitrogen doping [44,45]. In this work, the presence of interstitial N indicated by XPS suggests that N-doping could result in discrete energy levels above the valence band [40]. Hence, the transition between these discrete energy levels and the conduction band of HTiNbO5 might result in the visible light absorption of N-doped samples.…”

Section: Uv-vis Diffuse Reflectance Spectramentioning

confidence: 62%

“…According to the recent literature [38][39][40][41], the N 1s peak at approximately 399.1 eV can be attributed to the doped nitrogen atoms which are most likely located in the interstitial sites of TiNbO 5 -lamellae and chemically bound to hydrogen ions incorporated between the 2D TiNbO 5 -layered sheets. Such incorporation of doped nitrogen may be responsible for the significant improvement in the thermal stability of HTiNbO 5 .…”

Section: Xps Studiesmentioning

confidence: 96%

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Thermostable nitrogen-doped HTiNbO5 nanosheets with a high visible-light photocatalytic activity

Zhai

Huang

et al. 2011

Nano Res.

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Nitrogen-doped HTiNbO 5 nanosheets have been successfully synthesized by first exfoliating layered HTiNbO 5 in tetrabutylammonium hydroxide (TBAOH) to obtain HTiNbO 5 nanosheets and then heating the nanosheets with urea. The resulting samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), X-ray photoelectron spectroscopy (XPS), UV-vis spectroscopy and N 2 adsorption-desorption measurements. It was found that N-doping resulted in a much higher thermostability of the layered structure, intrinsic bandgap narrowing and a visible light response. The doped nitrogen atoms were mainly located in the interstitial sites of TiNbO 5 -lamellae and chemically bound to hydrogen ions. Compared with N-doped HTiNbO 5 , N-doped HTiNbO 5 nanosheets had a much larger specific surface area and richer mesoporosity due to the rather loose and irregular arrangement of titanoniobate nanosheets. Both N-doped layered HTiNbO 5 and HTiNbO 5 nanosheets showed a very high visible-light photocatalytic activity for the degradation of rhodamine B (RhB) aqueous solution. Moreover, due to the considerably larger surface area, richer mesoporosity and stronger acidity, N-doped HTiNbO 5 nanosheets had an even higher activity than N-doped HTiNbO 5 , although the latter had a stronger absorption in the visible region. The dye molecules were mainly degraded to aliphatic organic compounds and partially mineralized to CO 2 and/or CO, rather than being simply decolorized. The effect of photosensitization was insignificant and RhB was degraded mainly via the typical photocatalytic reaction routes. Two different reaction routes for the photodegradation of RhB under visible light irradiation over N-doped HTiNbO 5 nanosheets have been proposed. The present method can be extended to a large number of layered metal oxides that have the characteristics of intercalation and exfoliation, thus providing new opportunities for the fabrication of highly effective and potentially practical visible-light photocatalysts.

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Section: Uv-vis Diffuse Reflectance Spectramentioning

confidence: 62%

Section: Xps Studiesmentioning

confidence: 96%

Thermostable nitrogen-doped HTiNbO5 nanosheets with a high visible-light photocatalytic activity

Zhai

Huang

et al. 2011

Nano Res.

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“…[25,26] However, interstitial N-doping may be present in this case. [25] Nevertheless, when visible light (l > 400 nm) was used for CO 2 photoreduction over MEA-TiO 2 , neither CH 4 nor CO could be observed, suggesting that the visible-light response of MEA-TiO 2 does not have much effect in this study.…”

mentioning

confidence: 89%

Efficient CO₂ Capture and Photoreduction by Amine‐Functionalized TiO₂

Liao

Cao

Yuan

et al. 2014

Chemistry A European J

101

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“…Fang et al, 130 have prepared visible-light-active mesoporous N-doped TiO 2 photocatalysts by the precipitation of the titanyl oxalate complex ([TiO(C 2 O 4 ) 2 ] 2 À ). N-TiO 2 photocatalysts exhibit comparable UV-light activity and visible-light activity in the photodegradation of methyl orange.…”

Section: Nitrogen Doped Tio 2 Mesoporousmentioning

confidence: 99%

Mesoporous titania photocatalysts: preparation, characterization and reaction mechanisms

2011

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Titanium dioxide is a very important semiconductor with a high potential for applications in photocatalysis, solar cells, photochromism, sensoring, and various other areas of nanotechnology. Increasing attention has recently been focused on the simultaneous achievement of high bulk crystallinity and the formation of ordered mesoporous TiO 2 frameworks with high thermal stability. Mesoporous TiO 2 has continued to be highly active in photocatalytic applications because it is beneficial for promoting the diffusion of reactants and products, as well as for enhancing the photocatalytic activity by facilitating access to the reactive sites on the surface of photocatalyst. This steady progress has demonstrated that mesoporous TiO 2 nanoparticles are playing and will continue to play an important role in the protection of the environment and in the search for renewable and clean energy technologies. This review focuses on the preparation and characterisation of mesoporous titania, noble metals nanoparticles, transition metal ions, non-metal/doped mesoporous titania networks. The photocatalytic activity of mesoporous titania materials upon visible and UV illumination will be reviewed, summarized and discussed, in particular, concerning the influence of preparation and solid-state properties of the materials. Reaction mechanisms that are being discussed to explain these effects will be presented and critically evaluated.

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Bifunctional N-Doped Mesoporous TiO₂ Photocatalysts

Cited by 167 publications

References 40 publications

Thermostable nitrogen-doped HTiNbO5 nanosheets with a high visible-light photocatalytic activity

Thermostable nitrogen-doped HTiNbO5 nanosheets with a high visible-light photocatalytic activity

Efficient CO₂ Capture and Photoreduction by Amine‐Functionalized TiO₂

Mesoporous titania photocatalysts: preparation, characterization and reaction mechanisms

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Bifunctional N-Doped Mesoporous TiO2 Photocatalysts

Cited by 167 publications

References 40 publications

Thermostable nitrogen-doped HTiNbO5 nanosheets with a high visible-light photocatalytic activity

Thermostable nitrogen-doped HTiNbO5 nanosheets with a high visible-light photocatalytic activity

Efficient CO2 Capture and Photoreduction by Amine‐Functionalized TiO2

Mesoporous titania photocatalysts: preparation, characterization and reaction mechanisms

Contact Info

Product

Resources

About

Bifunctional N-Doped Mesoporous TiO₂ Photocatalysts

Efficient CO₂ Capture and Photoreduction by Amine‐Functionalized TiO₂