Nitrogen doped porous TiO 2 (N-TiO 2 ) 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-TiO 2 coating was greater than that of the TiO 2 coating due to different MAO processing parameters. The band gap energy of N-TiO 2 coating was reduced to 2.92 eV compared to TiO 2 coating. The band gap energy reduction of N-TiO 2 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 TiO 2 was significantly suppressed after doping with nitrogen. N-TiO 2 exhibited higher photocatalytic activity towards methylene blue dye degradation than to pure TiO 2 coating. The recyclability test of N-TiO 2 coating showed constant photocatalytic efficiency after the fourth run. Hence, N-TiO 2 porous coating could be a promising material for immobilised solar photocatalytic applications.
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