Abstract
Abstract Visible-light-responsive TiO2 catalysts were prepared using a one-pot method at low temperatures in different amine systems, using TiCl3 as the precursor. The as-synthesized TiO2 powders were characterized using X-ray diffraction, ultraviolet-visible absorption spectroscopy, elemental analysis, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The results reveal that the absorption onset of the as-synthesized TiO2 powders red-shifted to the visible region and that the ethylenediamine system was clearly superior to the triethylamine and diethylamine systems. The nitrogen atoms were located at the oxygen site in the TiO2 lattice to form an O-Ti-N structure in the ethylenediamine synthetic system. Phenol degradation was used as a probe reaction to evaluate the photocatalytic activity of nitrogen-doped TiO2; 97.88% phenol was degraded after reaction for 6 h under visible-light irradiation.
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