Abstract
(BiO)2CO3 microspheres and nanoparticles with different crystallinities have been successfully synthesized via a simple hydrothermal route. The as-prepared samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, UV–vis diffuse-reflectance spectroscopy, and nitrogen adsorption–desorption isotherms. The carbonate ions play a key role in controlling the morphology and crystallinity of (BiO)2CO3. The photocatalytic performance of the as-prepared (BiO)2CO3 samples was evaluated toward the removal of NO upon UV-, visible-, and simulated-solar-light irradiation. The results indicated that the photocatalytic activity of (BiO)2CO3 microspheres was higher than that of (BiO)2CO3 nanoparticles, which was mainly attributed to the synergistic effects of hierarchical structure, low crystallinity, and large surface areas.
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