Nitrogen‐doped Lamellar Niobic Acid with Visible Light‐responsive Photocatalytic Activity

Li, Xiukai; Kikugawa, Naoki; Ye, Jinhua

doi:10.1002/adma.200702975

Cited by 196 publications

(145 citation statements)

References 40 publications

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“…Unfortunately, doping with metallic elements can result in a decrease in thermal stability and an increase in carrier trapping, leading to a decrease in photocatalytic efficiency [28]. Recently, it was found that doping with nitrogen can shift the optical absorption edge of layered compounds to lower energy [29][30][31]. Furthermore, due to the fact that layered transition metal oxides such as HTiNbO 5 are usually nonporous and have a very small specific surface areas, their photocatalytic activities are relatively low.…”

Section: Introductionmentioning

confidence: 98%

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: Introductionmentioning

confidence: 98%

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

Zhai

Huang

et al. 2011

Nano Res.

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“…Semiconductor photocatalysis is presently attracting tremendous attentions due to its potential applications in clean hydrogen energy generation and decomposition of organic pollutants [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Since photocatalytic hydrogen generation over TiO 2 electrode was reported [15], a variety of Ti-, Nb-, Ta-, and W-based photocatalysts have been reported to exhibit activities for water splitting and decomposition of organic pollutants.…”

Section: Introductionmentioning

confidence: 99%

NaNbO3 Nanostructures: Facile Synthesis, Characterization, and Their Photocatalytic Properties

et al. 2009

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NaNbO 3 nanowires and cubes were synthesized by means of a facile surfactant-assisted hydrothermal process. The NaNbO 3 nanowires were single-crystalline and showed uniform size with a diameter of about 100 nanometers in width and length of up to several tens of micrometers in length. The NaNbO 3 cubes displayed edges of several hundred nanometers. Meanwhile, the possible growth mechanism of NaNbO 3 nanowires was proposed. In addition, the photocatalytic activities of the NaNbO 3 samples were evaluated for the H 2 evolution from CH 3 OH/ H 2 O solution under UV light irradiation. Compared with the cubes-NaNbO 3 and a NaNbO 3 sample prepared by solid state reaction method, NaNbO 3 nanowires showed a much higher photocatalytic activity.

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“…A comprehensive survey of photocatalytic activity, chemical stability, and environmental friendliness shows that the most promising photocatalysts might be titanium, niobium, or tantalum-based materials. For example, nickel-doped indium tantalate (NiInTaO 4 ) was first reported to split water overall under visible light; [2] lanthanum-doped sodium tantalate (La-NaTaO 3 ) holds the record of highest efficiency in splitting water under UV light; [3] and (AgNb) 1-x (SrTi) x O 3 [4,5] and N-HNb 3 O 8 [6] represent the materials responsible for the visible-light-induced degradation of gaseous organic molecules and liquid dyes, respectively. Materials for photocatalytic hydrogen production have been well reviewed recently by Osterloh [7] and Navarro et al [8] To improve their performance further, preparing nanosized photocatalysts presents an efficient strategy, because of their adjustable band gap, stronger photon absorption, larger specific surface area, and a shorter pathway for carrier transfer.…”

Section: Introductionmentioning

confidence: 99%

Building Niobate Nanoparticles with Hexaniobate Lindqvist Ions

Tong

2010

Eur J Inorg Chem

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We present a general method to fabricate niobate nanoparticles (NPs) by using hexaniobate Lindqvist ions as niobium source. First, soft-chemical synthesis was adopted to prepare amorphous compound NPs, which subsequently served as parent bodies, affording not only nanoscale size but also optimal compositions and elements for the final annealed nanocrystalline niobates. By this method, a series of nanocrystalline niobates, including MNbO 4 (M = In, Ga, Fe), MNb 2 O 6

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Nitrogen‐doped Lamellar Niobic Acid with Visible Light‐responsive Photocatalytic Activity

Cited by 196 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

NaNbO3 Nanostructures: Facile Synthesis, Characterization, and Their Photocatalytic Properties

Building Niobate Nanoparticles with Hexaniobate Lindqvist Ions

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