By a facile and rapid microwave-assisted hydrothermal reaction at 190 C for 30 min, niobium and nitrogen co-doping TiO2 nanoparticles were prepared. The obtained samples were characterized by XRD, UV-Vis spectroscopy, EDX analysis, and BET measurements. To evaluate the photocatalytic activity, destruction of NO x gas under the irradiation of several LED lamps with various wavelengths were carried out. Although co-doping of Nb with N into TiO2 resulted in the decrement of the specific surface area, it was useful to improve the photocatalytic activity for the oxidative destruction of NO, probably due to the effective reduction of the anion vacancy in the lattice which acts as the recombination center of the photo-induced electrons and holes.
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