Few studies have examined the photodegradation of bisphenol A (BPA) by sunlight/immobilized TiO₂ systems. In this investigation, N-doped TiO₂ (N-TiO₂) was prepared by the calcination of Degussa P25 and urea. The surface characteristics of N-TiO₂ were analyzed by X-ray diffraction, specific surface area analysis, ultraviolent (UV)-vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the prepared photocatalysts was determined by using them in the photodegradation of BPA under sunlight irradiation. The N-doping of TiO₂ reduced the particle size and band gap of the compound, while increasing the specific surface area and percentage of anatase therein. XPS characterization confirms the substitution of O in the crystal lattice for N species in N-TiO₂, forming O-Ti-N. The BPA degradation rate can be approximated by pseudofirst- order kinetics. At a N/Ti mole ratio of one for N-TiO₂, the rates of BPA photodegradation and mineralization were 0.042 and 0.006 min-1, respectively.
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