Abstract
Bi 3NbO 7 nanoparticles with a hollow structure can be easily prepared by a facile molten-salt technique, where an active precursor is firstly synthesized, and then calcined in KNO 3. The crystallization and development of Bi 3NbO 7 nanoparticles can be effectively controlled by adjusting such processing parameters as calcining temperature, holding time, and incorporated salt quantity. Without adding KNO 3, only large-sized and irregular particles can be obtained, having lower crystallinity. Introduction of KNO 3 will densify their microstructure and reduce their particle size, enhancing their crystallinity. At a low temperature (400 °C), Bi 3NbO 7 nanoparticles with a hollow structure can be obtained, exhibiting much better photocatalytic activity under visible light than its normal ones, but the hollow structure is sensitive to calcining temperature; at 500 °C, it completely disappears.
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