Solar photocatalytic activity of nitrogen doped TiO2 coating by micro-arc oxidation

S. Sridhar; T. Arunnellaiappan; N. Rameshbabu; S. Mika; A. Viswanathan

doi:10.1080/02670844.2016.1259090

Solar photocatalytic activity of nitrogen doped TiO₂ coating by micro-arc oxidation

S. Sridhar, T. Arunnellaiappan, N. Rameshbabu, S. Mika, A. Viswanathan

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

18 Citations (Scopus)

Abstract

Nitrogen doped porous TiO₂ (N-TiO₂) coating was developed from titanium nitride (TiN) by micro-arc oxidation (MAO), whereas TiN was prepared by plasma nitriding on commercially pure (Cp) titanium. The surface roughness of the N-TiO₂ coating was greater than that of the TiO₂ coating due to different MAO processing parameters. The band gap energy of N-TiO₂ coating was reduced to 2.92 eV compared to TiO₂ coating. The band gap energy reduction of N-TiO₂ was attributed to nitrogen doping and the mixture of anatase, rutile and new phase (TiN_0.30). The photoluminescence study demonstrated that the recombination rate of photo-generated electron–hole pairs of TiO₂ was significantly suppressed after doping with nitrogen. N-TiO₂ exhibited higher photocatalytic activity towards methylene blue dye degradation than to pure TiO₂ coating. The recyclability test of N-TiO₂ coating showed constant photocatalytic efficiency after the fourth run. Hence, N-TiO₂ porous coating could be a promising material for immobilised solar photocatalytic applications.

Original language	English
Pages (from-to)	779-786
Number of pages	8
Journal	Surface Engineering
Volume	33
Issue number	10
DOIs	https://doi.org/10.1080/02670844.2016.1259090
Publication status	Published - 3 Oct 2017
Externally published	Yes

Keywords

Anatase
MAO
N-TiO
Photocatalytic activity
Plasma nitriding
Rutile

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1080/02670844.2016.1259090

Cite this

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title = "Solar photocatalytic activity of nitrogen doped TiO2 coating by micro-arc oxidation",

abstract = "Nitrogen doped porous TiO2 (N-TiO2) coating was developed from titanium nitride (TiN) by micro-arc oxidation (MAO), whereas TiN was prepared by plasma nitriding on commercially pure (Cp) titanium. The surface roughness of the N-TiO2 coating was greater than that of the TiO2 coating due to different MAO processing parameters. The band gap energy of N-TiO2 coating was reduced to 2.92 eV compared to TiO2 coating. The band gap energy reduction of N-TiO2 was attributed to nitrogen doping and the mixture of anatase, rutile and new phase (TiN0.30). The photoluminescence study demonstrated that the recombination rate of photo-generated electron–hole pairs of TiO2 was significantly suppressed after doping with nitrogen. N-TiO2 exhibited higher photocatalytic activity towards methylene blue dye degradation than to pure TiO2 coating. The recyclability test of N-TiO2 coating showed constant photocatalytic efficiency after the fourth run. Hence, N-TiO2 porous coating could be a promising material for immobilised solar photocatalytic applications.",

keywords = "Anatase, MAO, N-TiO, Photocatalytic activity, Plasma nitriding, Rutile",

author = "S. Sridhar and T. Arunnellaiappan and N. Rameshbabu and S. Mika and A. Viswanathan",

note = "Publisher Copyright: {\textcopyright} 2016 Institute of Materials, Minerals and Mining Published by Taylor & Francis on behalf of the Institute.",

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AU - Sridhar, S.

AU - Arunnellaiappan, T.

AU - Rameshbabu, N.

AU - Mika, S.

AU - Viswanathan, A.

PY - 2017/10/3

Y1 - 2017/10/3

N2 - Nitrogen doped porous TiO2 (N-TiO2) coating was developed from titanium nitride (TiN) by micro-arc oxidation (MAO), whereas TiN was prepared by plasma nitriding on commercially pure (Cp) titanium. The surface roughness of the N-TiO2 coating was greater than that of the TiO2 coating due to different MAO processing parameters. The band gap energy of N-TiO2 coating was reduced to 2.92 eV compared to TiO2 coating. The band gap energy reduction of N-TiO2 was attributed to nitrogen doping and the mixture of anatase, rutile and new phase (TiN0.30). The photoluminescence study demonstrated that the recombination rate of photo-generated electron–hole pairs of TiO2 was significantly suppressed after doping with nitrogen. N-TiO2 exhibited higher photocatalytic activity towards methylene blue dye degradation than to pure TiO2 coating. The recyclability test of N-TiO2 coating showed constant photocatalytic efficiency after the fourth run. Hence, N-TiO2 porous coating could be a promising material for immobilised solar photocatalytic applications.

AB - Nitrogen doped porous TiO2 (N-TiO2) coating was developed from titanium nitride (TiN) by micro-arc oxidation (MAO), whereas TiN was prepared by plasma nitriding on commercially pure (Cp) titanium. The surface roughness of the N-TiO2 coating was greater than that of the TiO2 coating due to different MAO processing parameters. The band gap energy of N-TiO2 coating was reduced to 2.92 eV compared to TiO2 coating. The band gap energy reduction of N-TiO2 was attributed to nitrogen doping and the mixture of anatase, rutile and new phase (TiN0.30). The photoluminescence study demonstrated that the recombination rate of photo-generated electron–hole pairs of TiO2 was significantly suppressed after doping with nitrogen. N-TiO2 exhibited higher photocatalytic activity towards methylene blue dye degradation than to pure TiO2 coating. The recyclability test of N-TiO2 coating showed constant photocatalytic efficiency after the fourth run. Hence, N-TiO2 porous coating could be a promising material for immobilised solar photocatalytic applications.

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