Enhanced photocatalytic activity of TiO2−xNx loaded with copper ions under visible light irradiation

Morikawa, Takeshi; Irokawa, Yoshihiro; Ohwaki, Takeshi

doi:10.1016/j.apcata.2006.08.011

Cited by 128 publications

(95 citation statements)

References 46 publications

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“…8,20,21 Though no revolutionarily improved catalysts have been reported, several materials have been developed using this general strategy, either co-doped or modified with proficient electron-trapping metals, such as Fe, Cu, Ag, and Pt. [22][23][24][25] Main group elements have been a recent focus for TiO 2 modification, and several methods to prepare titania doped with nitrogen, sulfur, and carbon have been published. [9][10][11][26][27][28][29][30][31][32][33][34][35] Visiblelight sensitivity can be a result of localized states within the band gap and induced oxygen vacancies (Ti 3þ states).…”

Section: Introductionmentioning

confidence: 99%

Selenium-Modified TiO₂and Its Impact on Photocatalysis

Rockafellow¹,

Haywood²,

Witte³

et al. 2010

Langmuir

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This work describes the preparation of a selenium-modified TiO2 photocatalyst and a preliminary evaluation of its photocatalytic activity. Se-TiO2 displayed greater visible absorption than undoped TiO2 and was still capable of degrading quinoline at a slightly faster rate than undoped TiO2 under UV light. Se-TiO2 was also able to degrade organic molecules under purely visible light by a single electron transfer pathway. Irradiation with >435 nm light showed no evidence of efficient production of HO•-like species. Se-TiO2 was also examined under hypoxic conditions, where the Se atoms were capable of trapping photogenerated electrons as evidenced by XPS. This work describes the preparation of a selenium-modified TiO 2 photocatalyst and a preliminary evaluation of its photocatalytic activity. Se-TiO 2 displayed greater visible absorption than undoped TiO 2 and was still capable of degrading quinoline at a slightly faster rate than undoped TiO 2 under UV light. Se-TiO 2 was also able to degrade organic molecules under purely visible light by a single electron transfer pathway. Irradiation with >435 nm light showed no evidence of efficient production of HO•-like species. Se-TiO 2 was also examined under hypoxic conditions, where the Se atoms were capable of trapping photogenerated electrons as evidenced by XPS.

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Section: Introductionmentioning

confidence: 99%

Selenium-Modified TiO₂and Its Impact on Photocatalysis

Rockafellow¹,

Haywood²,

Witte³

et al. 2010

Langmuir

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“…An improved activity of Zr-TiO 2 and sintered ZrO 2 -TiO 2 has also been reported for the photodegradation of methylcyclohexane and ethylene, respectively, which was attributed to an increased surface acidity and larger surface area [4,17]. The reported optimal metal dopant concentration for anatase TiO 2 in photocatalysis applications generally falls between 1% and 10% [21,22,28]. Quite generally the route for cation substitution in TiO 2 appears to be a delicate balance between electronic-and structural modification, which may result in either band gap shifts and phase stabilization or undesirable local band gap states and lattice defects [13,29].…”

Section: Introductionmentioning

confidence: 99%

“…More recently complex heterostructured materials have been reported, such as diode structures made of p-and n-type semiconductors [19]. Studies of tertiary doping of TiO 2 with metal and inorganic elements have suggested that this strategy is potentially beneficial due to synergetic effects of increased lifetime of photo-generated electron-hole pairs following the metal inclusion and improved absorption properties in the visible region by incorporation of inorganic dopants [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Characterisation, phase stability and surface chemical properties of photocatalytic active Zr and Y co-doped anatase TiO2 nanoparticles

Mattsson

Lejon

Bakardjieva

et al. 2013

Journal of Solid State Chemistry

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PostprintThis is the accepted version of a paper published in Journal of Solid State Chemistry. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination. Citation for the original published paper (version of record):Mattsson, A., Lejon, C., Bakardjieva, S., Stengl, V., Österlund, L. (2013) Characterisation, phase-stability and surface chemical properties of photocatalytic active Zr and Y co-doped anatase TiO2 nanoparticles. The band gap is slightly blue-shifted at high doping concentrations, and red shifted at lower doping concentrations. Formic acid adsorption was used as a probe molecule to investigate surface chemical properties and adsorbate structures. It was found that the relative abundance of monodentate formate compared to bidentate coordinated formate decreases with increasing doping concentration. This is attributed to an increased surface acidity with increasing dopant concentration. Photodegradation of formic acid occurred on all samples. With mode-resolved in situ FTIR spectroscopy it is shown that the rate of photodegradation of monodentate formate species are higher than for bidentate formate species. Thus our results show that the trend of decreasing photo-degradation rate with increasing dopant concentration can be explained by the adsorbate structure, which is controlled by the acidity of the surface. Journal of Solid

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“…17,22 It has recently been reported that visible light activity of TiO 2 can be even further enhanced by suitable combination of metals and/or nonmetal ions. [23][24][25][26] Of various combinations, co-doping with sulfur and zirconium may draw special interest in that zirconium increases not only the surface area and the thermal stability of TiO 2 but also retards the e − /h + recombination. For instance, zirconium doped TiO 2 such as ZrO 2 -TiO 2 binary metal oxides 27,28 or Ti 1-x Zr x O 2 solid solutions 29,30 have shown higher photocatalytic activity than pure TiO 2 under UV.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Application of Zr,S Co-doped TiO₂as Visible-light Active Photocatalyst

Kim¹,

Khan²,

Kim

et al. 2008

Bulletin of the Korean Chemical Society

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A series of Zr,S co-doped TiO 2 were synthesized by a modified sol-gel method and characterized by various spectroscopic and analytical techniques. The presence of sulfur caused a red-shift in the absorption band of TiO 2 . Co-doping of sulfur and zirconium (Zr-TiO 2 -S) improves the surface properties such as surface area, pore volume, and pore diameter and also enhances the thermal stability of the anatase phase. The Zr-TiO 2 -S systems are very effective visible-light active catalysts for the degradation of toluene. All reactions follow pseudo firstorder kinetics with the decomposition rate reaching as high as 77% within 4 h. The catalytic activity decreases in the following order: Zr-TiO 2 -S > TiO 2 -S > Zr-TiO 2 > TiO 2 P-25, demonstrating the synergic effect of codoping with zirconium and sulfur. When the comparison is made within the series of Zr-TiO 2 -S, the catalytic performance is found to be a function of Zr-contents as follows: 3 wt % Zr-TiO 2 -S > 0.5 wt % Zr-TiO 2 -S > 5 wt % Zr-TiO 2 -S > 1 wt % Zr-TiO 2 -S. Higher calcination temperature decreases the reactivity of Zr-TiO 2 -S.

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Enhanced photocatalytic activity of TiO2−xNx loaded with copper ions under visible light irradiation

Cited by 128 publications

References 46 publications

Selenium-Modified TiO₂and Its Impact on Photocatalysis

Selenium-Modified TiO₂and Its Impact on Photocatalysis

Characterisation, phase stability and surface chemical properties of photocatalytic active Zr and Y co-doped anatase TiO2 nanoparticles

Synthesis, Characterization, and Application of Zr,S Co-doped TiO₂as Visible-light Active Photocatalyst

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Enhanced photocatalytic activity of TiO2−xNx loaded with copper ions under visible light irradiation

Cited by 128 publications

References 46 publications

Selenium-Modified TiO2and Its Impact on Photocatalysis

Selenium-Modified TiO2and Its Impact on Photocatalysis

Characterisation, phase stability and surface chemical properties of photocatalytic active Zr and Y co-doped anatase TiO2 nanoparticles

Synthesis, Characterization, and Application of Zr,S Co-doped TiO2as Visible-light Active Photocatalyst

Contact Info

Product

Resources

About

Selenium-Modified TiO₂and Its Impact on Photocatalysis

Selenium-Modified TiO₂and Its Impact on Photocatalysis

Synthesis, Characterization, and Application of Zr,S Co-doped TiO₂as Visible-light Active Photocatalyst