Visible-light-driven photocatalytic performance of nitrogen-doped Ti1−xZrxO2 solid solution

Gao, Bifen; Luo, Xiuzhen; Fu, Hao; Lin, Bin; Chen, Yilin; Gu, Zhanjun

doi:10.1016/j.materresbull.2012.11.044

Cited by 4 publications

(4 citation statements)

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“…For example, Liu et al 33 prepared nitrogen and zirconium co-doped TiO 2 nanotube arrays that exhibited improved photocatalytic efficiency. Gao et al 34 synthesized nitrogen-doped Ti 1−x Zr x O 2 that demonstrated an extended visible-light response. However, the existing states of the dopants for Zr and N co-doped TiO 2 and their corresponding band structures have still not been explored, and the influence of the dopants' existing states on the absorption and behavior of the photogenerated carriers as well as the photocatalytic mechanism of the photocatalysts still needs to be investigated further.…”

Section: Introductionmentioning

confidence: 99%

Structure of Nitrogen and Zirconium Co-Doped Titania with Enhanced Visible-Light Photocatalytic Activity

Zhang

Wang

et al. 2014

ACS Appl. Mater. Interfaces

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Nitrogen and zirconium co-doped TiO2 (TiO2-N-x%Zr) photocatalysts were synthesized via a sol-gel method. The existing states of the dopants (N and Zr) and their corresponding band structures were investigated via XRD, Raman, BET, XPS, TEM, FT-IR, UV-vis DRS, and PL techniques. It was found that N existed only as a surface species (NOx) and Zr(4+) was doped in a substitutional mode; the doping of Zr(4+) ions and modification of N extended the absorption into the visible region and inhibited the recombination of electrons and holes. Moreover, the excess Zr(4+) ions existed as the ZrTiO4 phase when the content of Zr was sufficiently high, which could also contribute to the separation of the charge carriers. Therefore, the TiO2-N-x%Zr samples show enhanced visible-light photocatalytic activity compared with single-doped TiO2. These results offer a paradigm for the design and fabrication of optoelectronic functional materials such as solar cells and photocatalysts.

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Section: Introductionmentioning

confidence: 99%

Structure of Nitrogen and Zirconium Co-Doped Titania with Enhanced Visible-Light Photocatalytic Activity

Zhang

Wang

et al. 2014

ACS Appl. Mater. Interfaces

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“…11). 178 The N-Nb-TiO 2 (25 mol% Nb) prepared by sol-gel process, followed by nitridation under owing ammonia, exhibited a 6fold increase in MB degradation under visible light compared to other Nb doped samples (<25 mol%). 179 The energy of N 2p levels are close to the hydroxyl radical potential [E(H 2 O/cOH) ¼ 2.37 eV] such that the photoinduced holes can react with surface hydroxyl species to form hydroxyl radicals.…”

Section: Incorporation Of Nitrogen Along With Other Metal Dopants Int...mentioning

confidence: 95%

“…[174][175][176][177] The nitrogen-doped Ti 1Àx Zr x O x solid solutions obtained by hydrothermal method exhibited a much higher activity for acid red 88 and benzene degradation under visible light irradiation compared to N-TiO 2 , which was attributed to the synergistic effect of nitrogen and zirconium dual-modication. 178 XPS and DRS studies revealed that nitrogen was mainly doped on the surface layer of catalyst and induced a surface state close to VB. On the other hand, lattice Ti 4+ ions were substituted by Zr 4+ ions, resulting in the elevation of CB thus facilitating electron transfer and separation of charge carriers.…”

Section: Incorporation Of Nitrogen Along With Other Metal Dopants Int...mentioning

confidence: 99%

“…On the other hand, lattice Ti 4+ ions were substituted by Zr 4+ ions, resulting in the elevation of CB thus facilitating electron transfer and separation of charge carriers. 178 In N-TiO 2 solid solutions, electrons are excited from surface state to CB and subsequently transferred to adsorbed surface species. In comparison to N-TiO 2 , the elevation of CB in N-Ti 1Àx Zr x O 2 could not utilize the visible light efficiently; however, it had the strong potential required to reduce oxygen leading to the formation of active oxygen radicals (Fig.…”

Section: Incorporation Of Nitrogen Along With Other Metal Dopants Int...mentioning

confidence: 99%

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Review on modified N–TiO₂ for green energy applications under UV/visible light: selected results and reaction mechanisms

2014

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Enhanced photocatalytic activity of mesoporous ZnFe2O4 nanoparticles towards gaseous benzene under visible light irradiation

Tabari

Singh

Jamali

2017

Journal of Environmental Chemical Engineering

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24 A mesoporous ZnFe 2 O 4 nanoparticles prepared as a visible light responsive catalyst, the 25 morphology, structure and optical property of the spinel oxide are characterised, diligently. 26 Photocatalytic activity of ZnFe 2 O 4 nanoparticles assessed toward the oxidation of gaseous 27 benzene. A comparative study conducted, between ZnFe 2 O 4 and Fe 2 O 3 , in terms of water and 28 benzene adsorption using microcalorimetry as well as photocatalytic benzene oxidation. In this 29 context, ZnFe 2 O 4 showed greater activity than Fe 2 O 3 . The heats of water adsorption for the 30 spinel and hematite are -270 kJ/mol and -190 kJ/mol, respectively; revealing the dissociative 31 mode of the adsorption, which is crucial for the generation of hydroxyl radicals. Moreover, the 32 heat of benzene adsorption for ZnFe 2 O 4 and Fe 2 O 3 are -167 kJ/mol and -139 kJ/mol, 33 respectively. Finally, the intermediate (phenol) and products (H 2 & CO 2 ) of the oxidation 34 reaction is monitored by GC (FID/TCD) and DRIFT: a mechanism is proposed accordingly for 35 the photocatalytic oxidation of the benzene. 36 37 Keywords: ZnFe 2 O 4 ; Fe 2 O 3 ; Gaseous benzene; Visible-light photocatalysis; Adsorption of 38 water; Hydroxyl radicals. 39 40VOCs with a high oxidation potential and sorely stable structure that makes it a proper choice as 47 an organic reactant to evaluate the photocatalytic property of semiconductors, compare to dyes 48 that are easily photo-oxidised due to their lower oxidation potential [4,5]. A limited number of 49 publications are reported about the gas-phase photocatalytic oxidation of benzene under visible 50 light irradiation [6][7][8][9][10][11]. Consequently, preparation of stable and low-cost semiconductors with 51 narrow bandgap energy to absorb a large number of solar energy is vital [12]. In this context, 52 hematite (Fe 2 O 3 ) is the most thermodynamically stable iron oxide phases at ambient temperature 53 and it has narrow band gap energy (2.2 eV) [13]. However, hematite has its own disadvantages 54 due to poor conductivity, high charge recombination rates and short hole diffusion length (2-4 55 nm) [14][15][16]. Encountering these issues, semiconductors consisting of two or more distinct 56 semiconductor components have become a focus of intense research due to their unique and 57 enhanced performances nanoparticle [17][18][19][20]. In such case, spinel oxides have attracted great 58 interest for catalytic reactions due to their desirable properties, such as single crystal shape, high 59 thermal stability, and well diffused, etc. [21][22][23][24]. ZnFe 2 O 4 is an n-type semiconductor and one of 60 the most promising spinel system materials [25]. It has been investigated in many applications, 61 such as photocatalysis, magnetic resonance imaging, drug delivery technology and gas sensor 62 due to its low cost, eco-friendly and photo-corrosion resistant advantages [26][27][28]. In spite of the 63 great potential, there have been only limited studies of these materials, mainly as a 64 supplementary co...

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Visible-light-driven photocatalytic performance of nitrogen-doped Ti1−xZrxO2 solid solution

Cited by 4 publications

References 37 publications

Structure of Nitrogen and Zirconium Co-Doped Titania with Enhanced Visible-Light Photocatalytic Activity

Structure of Nitrogen and Zirconium Co-Doped Titania with Enhanced Visible-Light Photocatalytic Activity

Review on modified N–TiO₂ for green energy applications under UV/visible light: selected results and reaction mechanisms

Enhanced photocatalytic activity of mesoporous ZnFe2O4 nanoparticles towards gaseous benzene under visible light irradiation

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Visible-light-driven photocatalytic performance of nitrogen-doped Ti1−xZrxO2 solid solution

Cited by 4 publications

References 37 publications

Structure of Nitrogen and Zirconium Co-Doped Titania with Enhanced Visible-Light Photocatalytic Activity

Structure of Nitrogen and Zirconium Co-Doped Titania with Enhanced Visible-Light Photocatalytic Activity

Review on modified N–TiO2 for green energy applications under UV/visible light: selected results and reaction mechanisms

Enhanced photocatalytic activity of mesoporous ZnFe2O4 nanoparticles towards gaseous benzene under visible light irradiation

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Review on modified N–TiO₂ for green energy applications under UV/visible light: selected results and reaction mechanisms