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(BiO) 2 CO 3 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) 2 CO 3 . The photocatalytic performance of the as-prepared (BiO) 2 CO 3 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) 2 CO 3 microspheres was higher than that of (BiO) 2 CO 3 nanoparticles, which was mainly attributed to the synergistic effects of hierarchical structure, low crystallinity, and large surface areas.
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Cen et al. (2014) studied this question.
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