Highly visible light active TiO2-xNx heterojunction photocatalysts

Vinodkumar Etacheri; Michael K. Seery; Steven J. Hinder; Suresh C. Pillai

doi:10.1021/cm903260f

Highly visible light active TiO_2-xN_x heterojunction photocatalysts

Vinodkumar Etacheri, Michael K. Seery, Steven J. Hinder, Suresh C. Pillai

Research output: Contribution to journal › Article › peer-review

277 Citations (Scopus)

Abstract

diaminetetraacetic acid (EDTA) modified sol-gel process.An FT-IR study of EDTA modified TiO₂ gel confirms the existence of an ionic intermediate (as indicated by a Δ value of 233 cm^-1). Differential scanning calorimetry (DSC), X-ray diffraction (XRD), and Raman spectroscopy are employed to study the phase evolution, phase purity, and crystallite size of samples. Formations of O-Ti-N and N-Ti-N bonds in calcined samples are confirmed using XPS and FT-IR spectroscopy. AllEDTAmodified samples show significantly higher visible light photocatalytic activity than the unmodified sample. The most active nitrogen doped heterojunction obtained at 400 °C exhibits 9-fold visible light activity in comparison to the standard photocatalyst Degussa P-25. It is proposed that the photo excited electrons (from the visible midgap level) are effectively transferred from the conduction band of anatase to that of rutile causing effective electron-hole separation, which is responsible for the higher visible light activity and lower photoluminescence (PL) intensity.

Original language	English
Pages (from-to)	3843-3853
Number of pages	11
Journal	Chemistry of Materials
Volume	22
Issue number	13
DOIs	https://doi.org/10.1021/cm903260f
Publication status	Published - 13 Jul 2010
Externally published	Yes

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10.1021/cm903260f

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title = "Highly visible light active TiO2-xNx heterojunction photocatalysts",

abstract = "diaminetetraacetic acid (EDTA) modified sol-gel process.An FT-IR study of EDTA modified TiO2 gel confirms the existence of an ionic intermediate (as indicated by a Δ value of 233 cm-1). Differential scanning calorimetry (DSC), X-ray diffraction (XRD), and Raman spectroscopy are employed to study the phase evolution, phase purity, and crystallite size of samples. Formations of O-Ti-N and N-Ti-N bonds in calcined samples are confirmed using XPS and FT-IR spectroscopy. AllEDTAmodified samples show significantly higher visible light photocatalytic activity than the unmodified sample. The most active nitrogen doped heterojunction obtained at 400 °C exhibits 9-fold visible light activity in comparison to the standard photocatalyst Degussa P-25. It is proposed that the photo excited electrons (from the visible midgap level) are effectively transferred from the conduction band of anatase to that of rutile causing effective electron-hole separation, which is responsible for the higher visible light activity and lower photoluminescence (PL) intensity.",

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year = "2010",

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T1 - Highly visible light active TiO2-xNx heterojunction photocatalysts

AU - Etacheri, Vinodkumar

AU - Seery, Michael K.

AU - Hinder, Steven J.

AU - Pillai, Suresh C.

PY - 2010/7/13

Y1 - 2010/7/13

N2 - diaminetetraacetic acid (EDTA) modified sol-gel process.An FT-IR study of EDTA modified TiO2 gel confirms the existence of an ionic intermediate (as indicated by a Δ value of 233 cm-1). Differential scanning calorimetry (DSC), X-ray diffraction (XRD), and Raman spectroscopy are employed to study the phase evolution, phase purity, and crystallite size of samples. Formations of O-Ti-N and N-Ti-N bonds in calcined samples are confirmed using XPS and FT-IR spectroscopy. AllEDTAmodified samples show significantly higher visible light photocatalytic activity than the unmodified sample. The most active nitrogen doped heterojunction obtained at 400 °C exhibits 9-fold visible light activity in comparison to the standard photocatalyst Degussa P-25. It is proposed that the photo excited electrons (from the visible midgap level) are effectively transferred from the conduction band of anatase to that of rutile causing effective electron-hole separation, which is responsible for the higher visible light activity and lower photoluminescence (PL) intensity.

AB - diaminetetraacetic acid (EDTA) modified sol-gel process.An FT-IR study of EDTA modified TiO2 gel confirms the existence of an ionic intermediate (as indicated by a Δ value of 233 cm-1). Differential scanning calorimetry (DSC), X-ray diffraction (XRD), and Raman spectroscopy are employed to study the phase evolution, phase purity, and crystallite size of samples. Formations of O-Ti-N and N-Ti-N bonds in calcined samples are confirmed using XPS and FT-IR spectroscopy. AllEDTAmodified samples show significantly higher visible light photocatalytic activity than the unmodified sample. The most active nitrogen doped heterojunction obtained at 400 °C exhibits 9-fold visible light activity in comparison to the standard photocatalyst Degussa P-25. It is proposed that the photo excited electrons (from the visible midgap level) are effectively transferred from the conduction band of anatase to that of rutile causing effective electron-hole separation, which is responsible for the higher visible light activity and lower photoluminescence (PL) intensity.

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JF - Chemistry of Materials

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ER -

Highly visible light active TiO_2-xN_x heterojunction photocatalysts

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