Effects of urea amounts and nitrogenation reaction temperature on optical absorption performances of N-doped KTiNbO5

Abstract

The enhancement of optical absorption performance is the premise and foundation of the improving of the photocatalytic efficiency. Nitrogen doping is an effective mean to enhance the optical absorption performance. In this study, a series of nitrogen-doped KTiNbO5 with the different reaction temperature and urea amounts are prepared by solid-phase reaction. The structure and doping behavior are characterized by powder X-ray diffraction, transmission electron microscopy, laser Raman spectroscopy and X-ray photoelectron spectroscopy. The optical absorption performances of the N-doped KTiNbO5 are measured by UV–visible diffuse reflectance spectroscopy. The results show that N-doped KTiNbO5 remains good crystalline and layered structure, with the increase of reaction temperature and urea amounts, the d-spacing decreases from 0.924 to 0.906 nm. The effects of the temperature and urea amounts on the optical performance are significative, the band gap energy decrease from 3.62 to 2.81 eV with the increase of reaction temperature and urea amounts. The structure determines the performance. The optical absorption performance is enhanced after N doping.