Notice of RetractionN-Doped TiO2 from NH4Cl for Photodecomposition of Rhodamine B under Sunlight Irradiation

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N-doped titanium dioxide photocatalysts were prepared by a sol-gel process using tetrabutyl titanate as titanium source and ammonium chloride as nitrogen source. X ray powder diffraction shows that N-doped TiO₂ catalysts exhibit high thermal stability and highly resistant to the phase transformation process from anatase phase to rutile phase. X-ray photoemission spectroscopy indicated nitrogen were effectively doped into TiO₂ particles and nitrogen species in the form of N Ti-O and Ti-O-N. The results of the photodecomposition of Rhodamine B under visible-light irradiation suggest the photocatalytic activity of the N-doped TiO₂ was greatly improved when compared with that of the undoped TiO₂ photocatalyst. Calcination temperature and N/Ti molar ratio percent can affect the degradation ratio of RhB. The optimal activity of the N-doped TiO₂ calcined at 350°C was observed for the 3 molar ratio percent of N:Ti, and the ratio of photodecomposition has achieved 90.31%.