A novel K2Nb2O6 photocatalyst with pyrochlore structure has been synthesized via a facile one-pot hydrothermal route with no aid of additives. The as-prepared samples were characterized by powder X-ray diffraction, ultraviolet-visible spectroscopy and field emission scanning electron microscopy. The photocatalytic H2evolution was performed in an aqueous methanol solution under UV light irradiation. The as-prepared K2Nb2O6 photocatalyst with pyrochlore structure showed higher H2 production activity than that of perovskite KNbO3 and commercial Nb2O5 powders in the absence of cocatalysts, due mainly to its unique crystal and energy band structures. The rate of H2 evolution can be significantly enhanced by loading of Pt nanoparticles. The highest H2 evolution rate of 121 µmol/h was reached when 0.7 wt% Pt nanoparticles were used, which was about 20 times higher than that of pristine K2Nb2O6. Chin. J. Chem |
