Nitrogen-Doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mrow><mml:mtext>TiO</mml:mtext></mml:mrow><mml:mn mathvariant="bold">2</mml:mn></mml:msub></mml:mrow></mml:math>Photocatalyst Prepared by Mechanochemical Method: Doping Mechanisms and Visible Photoactivity of Pollutant Degradation

Tang, Yuchao; Huang, Xianhuai; Yu, Han‐Qing; Tang, Li

doi:10.1155/2012/960726

Cited by 18 publications

(15 citation statements)

References 39 publications

(53 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The 396 eV peak is assigned to the atomic b-N state and generally proves the presence of TiAN bonds formed when N atoms replace the oxygen in the TiO 2 crystal lattice [30]. The peak characteristic for Ti-N (396 eV) is not present, indicating the absence of the TiN phase in the N-TiO 2 samples [34]. The results show that the binding energies of Ti 2p peaks shift to lower energies with a negative shift of ∼0.5 eV for the N-TiO 2 due to the N doping [27].…”

Section: Analysis Of Chemical Statementioning

confidence: 96%

The Synergistic Effect of Nitrogen Dopant and Calcination Temperature on the Visible-Light-Induced Photoactivity of N-Doped TiO₂

Lin

Weng

Hsu

et al. 2013

International Journal of Photoenergy

View full text Add to dashboard Cite

The synergistic effect of nitrogen content and calcinations temperature on the N-doped TiO2catalysts prepared by sol-gel method was investigated. The phase and structure, chemical state, optical properties, and surface area/pore distribution of N-doped TiO2were characterized using X-ray diffraction spectrometer, high-resolution transmission electron microscope, X-ray photoelectron spectroscopy, UV-vis diffusion reflectance spectroscopy, and Brunauer-Emmett-Teller specific surface area. Finding showed that the photocatalytic activity of N-doped TiO2was greatly enhanced compared to pure TiO2under visible irradiation. N dopants could retard the transformation from anatase to rutile phase. Namely, N-doping effect is attributed to the anatase phase stabilization. The results showed nitrogen atoms were incorporated into the interstitial positions of the TiO2lattice. Ethylene was used to evaluate the photocatalytic activity of samples under visible-light illumination. The results suggested good anatase crystallization, smaller particle size, and larger surface are beneficial for photocatalytic activity of N-doped TiO2. The N-doped TiO2catalyst prepared with ammonia to titanium isopropoxide molar ratio of 2.0 and calcinated at 400°C showed the best photocatalytic ability.

show abstract

Section: Analysis Of Chemical Statementioning

confidence: 96%

The Synergistic Effect of Nitrogen Dopant and Calcination Temperature on the Visible-Light-Induced Photoactivity of N-Doped TiO₂

Lin

Weng

Hsu

et al. 2013

International Journal of Photoenergy

View full text Add to dashboard Cite

show abstract

“…For this reason, the effects of the substitution of NH groups for surface oxygen atoms were estimated as an example of a structural modification other than NH 3 adsorption. NH groups are commonly found in N-doped TiO 2 , and originate from reactions between adsorbed NH 3 molecules and surface oxygen atoms. , The molecular geometries of various Ta 16 O 40– y (NH) y species ( y = 2, 4, 6, 8, or 10) were optimized using DFT, and the excited states were calculated using TDDFT.…”

Section: Experimental and Computational Detailsmentioning

confidence: 99%

Effects of Ta₂O₅ Surface Modification by NH₃ on the Electronic Structure of a Ru-Complex/N–Ta₂O₅ Hybrid Photocatalyst for Selective CO₂ Reduction

et al. 2018

View full text Add to dashboard Cite

This work examined a Ru-complex/N−Ta 2 O 5 (N−Ta 2 O 5 : nitrogen-doped Ta 2 O 5 ) hybrid photocatalyst for CO 2 reduction. In this material, electrons are transferred from the N−Ta 2 O 5 to the Ru-complex in response to visible light irradiation, after which CO 2 reduction occurs on the complex. N-doping is believed to produce an upward shift in the conduction band minimum (CBM) of the Ta 2 O 5 , thus allowing more efficient electron transfer, although the associated mechanism has not yet been fully understood. In the present study, the effects of NH 3 adsorption (the most likely surface modification following nitrification) were examined using a combined experimental and theoretical approach. X-ray photoelectron spectroscopy data suggest that NH 3 molecules are adsorbed on the N−Ta 2 O 5 surface, and it is also evident that the photocatalytic activity of the Ru-complex/N−Ta 2 O 5 is decreased by the removal of this adsorbed NH 3 . Calculations show that both the occupied and unoccupied orbital levels of Ta 16 O 40 (NH 3 ) x clusters (x = 4, 8, 12, or 16) are shifted upward as x is increased. Theoretical analyses of Ru-complex/cluster hybrids demonstrate that the gap between the lowest unoccupied molecular orbital of the Ta 16 O 40 moiety and the unoccupied orbitals of the Ru-complex in Rucomplex/Ta 16 O 40 (NH 3 ) 12 is much smaller than that in Ru-complex/Ta 16 O 40 . The highest occupied molecular orbital of [Rucomplex/Ta 16 O 40 ] − is evidently localized on the Ta 16 O 40 moiety, whereas that of [Ru-complex/Ta 16 O 40 (NH 3 ) 12 ] − is spread over both the Ta 16 O 40 and Ru-complex. These results indicate that the NH 3 adsorption associated with N-doping can result in an upward shift of the CBM of Ta 2 O 5 . Additional calculations for Ta 16 O 40−y (NH) y (y = 2, 4, 6, 8, or 10) suggest that the substitution of NH groups for oxygen atoms on the Ta 2 O 5 surface may be responsible for the red shift in the adsorption band edge of the oxide but makes only a minor contribution to the upward shift of the CBM.

show abstract

“…Generally speaking, there are two kinds of processes to prepare N-doped TiO 2 . One process can be ascribed as one-step direct incorporation of N atoms into TiO 2 lattice, such as sol-gel method [74][75][76], chemical vapor deposition (CVD) [77,78], atomic layer deposition (ALD) [79][80][81], hydrothermal method [82][83][84], solvothermal method [85][86][87][88], sol-hydrothermal process [89], hydrolysis-precipitation process [90], bioprocess-inspired method [91], electrochemical method [92][93][94], ion implantation [95,96], combustion method [97][98][99], mechanochemical method [100,101], low-temperature direct nitridization method [102], and microwave-assisted method [103]. [102].…”

Section: Preparationmentioning

confidence: 99%

Influences of Doping on Photocatalytic Properties of TiO2 Photocatalyst

Huang¹,

Yan²,

Zhao³

2016

Semiconductor Photocatalysis - Materials, Mechanisms and Applications

View full text Add to dashboard Cite

As a kind of highly effective, low-cost, and stable photocatalysts, TiO 2 has received substantial public and scientific attention. However, it can only be activated under ultraviolet light irradiation due to its wide bandgap, high recombination, and weak separation efficiency of carriers. Doping is an effective method to extend the light absorption to the visible light region. In this chapter, we will address the importance of doping, different doping modes, preparation method, and photocatalytic mechanism in TiO 2 photocatalysts. Thereafter, we will concentrate on Ti 3+ self-doping, nonmetal doping, metal doping, and codoping. Examples of progress can be given for each one of these four doping modes. The influencing factors of preparation method and doping modes on photocatalytic performance (spectrum response, carrier transport, interfacial electron transfer reaction, surface active sites, etc.) are summed up. The main objective is to study the photocatalytic processes, to elucidate the mechanistic models for a better understanding the photocatalytic reactions, and to find a method of enhancing photocatalytic activities.

show abstract

Nitrogen-DopedTiO2Photocatalyst Prepared by Mechanochemical Method: Doping Mechanisms and Visible Photoactivity of Pollutant Degradation

Cited by 18 publications

References 39 publications

The Synergistic Effect of Nitrogen Dopant and Calcination Temperature on the Visible-Light-Induced Photoactivity of N-Doped TiO₂

The Synergistic Effect of Nitrogen Dopant and Calcination Temperature on the Visible-Light-Induced Photoactivity of N-Doped TiO₂

Effects of Ta₂O₅ Surface Modification by NH₃ on the Electronic Structure of a Ru-Complex/N–Ta₂O₅ Hybrid Photocatalyst for Selective CO₂ Reduction

Influences of Doping on Photocatalytic Properties of TiO2 Photocatalyst

Contact Info

Product

Resources

About

Nitrogen-DopedTiO2Photocatalyst Prepared by Mechanochemical Method: Doping Mechanisms and Visible Photoactivity of Pollutant Degradation

Cited by 18 publications

References 39 publications

The Synergistic Effect of Nitrogen Dopant and Calcination Temperature on the Visible-Light-Induced Photoactivity of N-Doped TiO2

The Synergistic Effect of Nitrogen Dopant and Calcination Temperature on the Visible-Light-Induced Photoactivity of N-Doped TiO2

Effects of Ta2O5 Surface Modification by NH3 on the Electronic Structure of a Ru-Complex/N–Ta2O5 Hybrid Photocatalyst for Selective CO2 Reduction

Influences of Doping on Photocatalytic Properties of TiO2 Photocatalyst

Contact Info

Product

Resources

About

The Synergistic Effect of Nitrogen Dopant and Calcination Temperature on the Visible-Light-Induced Photoactivity of N-Doped TiO₂

The Synergistic Effect of Nitrogen Dopant and Calcination Temperature on the Visible-Light-Induced Photoactivity of N-Doped TiO₂

Effects of Ta₂O₅ Surface Modification by NH₃ on the Electronic Structure of a Ru-Complex/N–Ta₂O₅ Hybrid Photocatalyst for Selective CO₂ Reduction