scholarly journals Influence of electronic structure on visible light photocatalytic activity of nitrogen-doped TiO2

RSC Advances ◽  
2017 ◽  
Vol 7 (4) ◽  
pp. 1887-1898 ◽  
Author(s):  
Daigo Kusano ◽  
Masato Emori ◽  
Hiroshi Sakama
Keyword(s):  
Electronic Structure ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Sol Gel ◽  
Valence Band Maximum ◽  
Localized States ◽  
Band Maximum ◽  
Nitrogen Doped ◽  
Visible Light Photocatalytic

N-doped TiO2 was synthesized by sol–gel method from precursor solutions with or without urea and post calcination in NH3 gas. Localized states associated with N were successfully found at 0.24 eV to 0.34 eV above valence band maximum in the band gap.

scholarly journals Enhanced Visible Light Photocatalytic Activity of Mesoporous AnataseTiO2Codoped with Nitrogen and Chlorine

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Xiuwen Cheng ◽  
Xiujuan Yu ◽  
Zipeng Xing ◽  
Lisha Yang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Light Absorption ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Visible Region ◽  
X Ray ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Photocatalytic

Anatase mesoporous titanium dioxide codoped with nitrogen and chlorine (N-Cl-TiO2) photocatalysts were synthesized through simple one-step sol-gel reactions in the presence of ammonium chloride. The resulting materials were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible diffuse reflection spectrum (UV-vis DRS). XRD results indicated that codoping with nitrogen and chlorine could effectively retard the phase transformation of TiO2from anatase to rutile and the growth of the crystallite sizes. XPS revealed that nitrogen and chlorine elements were incorporated into the lattice of TiO2through substituting the lattice oxygen atoms. DRS exhibited that the light absorption of N-Cl-TiO2in visible region was greatly improved. As a result, the band gap of TiO2was reduced to 2.12 eV. The photocatalytic activity of the as-synthesized TiO2was evaluated for the degradation of RhB and phenol under visible light irradiation. It was found that N-Cl-TiO2catalyst exhibited higher visible light photocatalytic activity than that of P25 TiO2and N-TiO2, which was attributed to the small crystallite size, intense light absorption in visible region, and narrow band gap.

Visible-Light Driven BiFeO3 Nanosized Photocatalysts Prepared by a Sol-Gel Process

2011 ◽  
Vol 110-116 ◽  
pp. 1912-1917 ◽  
Author(s):  
Pei Song Tang ◽  
Hai Feng Chen ◽  
Feng Cao ◽  
Guo Xiang Pan ◽  
Min Hong Xu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Specific Surface ◽  
Band Gap ◽  
Surface Area ◽  
Narrow Band ◽  
Sol Gel ◽  
Large Specific Surface Area ◽  
Sol Gel Process ◽  
Visible Light Photocatalytic

The single perovskite BiFeO3 nanoparticles were prepared by a sol-gel process. The BiFeO3 nanoparticles were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy, and Brunauer-Emmett-Teller (BET) method. It was found that the prepared BiFeO3 nanoparticles show the large specific surface area of 136 m2/g, and narrow band gap of 2.12 eV. Consequently, BiFeO3 nanoparticles show high visible-light photocatalytic activity for decomposition of methylene blue in comparison with the commercial Degussa P25. It is concluded that the large specific surface area and the narrow band gap contribute to the high visible-light photocatalytic activity through enhanced adsorption capability and visible-light absorption.

Synthesis of Nitrogen-Doped Mesoporous TiO2 Film and its Visible Light Photocatalytic Activity

2011 ◽  
Vol 374-377 ◽  
pp. 895-898
Author(s):  
Xiao Xia Lin ◽  
De Gang Fu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Spin Coating ◽  
Sol Gel ◽  
Carbon Spheres ◽  
Active Nitrogen ◽  
Nitrogen Doped ◽  
Visible Light Active ◽  
Reactive Red 2 ◽  
Visible Light Photocatalytic

A visible-light-active nitrogen-doped mesoporous TiO2 (N-TiO2) film was synthesized via sol-gel spin-coating technique, using carbon spheres as pore-forming materials. The as-prepared film was characterized by XRD, BET, SEM, XPS and UV-Vis. The N-TiO2 film showed higher photocatalytic activity in the degradation of dye Reactive Brilliant Red X-3B (C.I. reactive red 2) under visible light irradiation compared with smooth TiO2 film and P25 film. The apparent rate constant of the N-TiO2 film was almost 10 times as that of P25 film.

Quantum dots in photocatalytic applications: efficiently enhancing visible light photocatalytic activity by integrating CdO quantum dots as sensitizers

2017 ◽  
Vol 19 (36) ◽  
pp. 24915-24927 ◽  
Author(s):  
A. H. Reshak
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Visible Light Irradiation ◽  
Photocatalytic Performance ◽  
Optical Band Gap ◽  
Visible Light Active ◽  
Photocatalytic Applications ◽  
Visible Light Photocatalytic

The amalgamation of a wide optical band gap photocatalyst with visible-light-active CdO quantum dots (QDs) as sensitizers is one of the most efficient ways to improve photocatalytic performance under visible light irradiation.

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