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Abstract
Single-crystal BiOCl nanosheets, with high{001}facets exposed, were synthesized through a facile hydrolysis reaction under general atmospheric pressure, without adding any organic surfactant or agent. The thickness of the BiOCl nanosheets is about 20 nm, and the diameter is arranged from 200 to 400 nm. The structure of the BiOCl nanosheets was characterized by X-ray diffraction, energy disperse X-ray spectrum, transmission electron microscopy, and selective area electron diffraction. Moreover, three different dyes were used as model molecules to test the photocatalytic activity of BiOCl nanosheets under visible light. It was found that the BiOCl nanosheets possess selective photocatalytic behavior as their activity over RhB is much higher than that over MO or MB. Based on the analysis of the experimental results, the potential mechanism was discussed.
Highlights
With the development of modern industrial society, environmental pollution and energy shortage have evolved into a global crisis
The general morphology of the as-prepared Bismuth oxide chloride (BiOCl) nanosheets was characterized by scanning electron microscope (SEM) and TEM as shown in Figure 1, which is irregular nanosheet structure
Further analyses of BiOCl nanosheets have been characterized by high resolution transmission electron microscope (HRTEM) and selected area electron diffraction (SAED)
Summary
With the development of modern industrial society, environmental pollution and energy shortage have evolved into a global crisis. Liu et al did much research about the catalytic mechanism of TiO2 in degrading different dye solution. The tetragonal [Bi2O2] structure is combined by two chlorine slabs to get a “sandwich” layer and different layers are stacked together by the nonbonding interaction (van der Waals) It is the indirect transition band gap semiconductor, with the band gap of about 3.27 eV. The mechanism of BiOCl nanosheets degrading the dyes solution was concluded by visible light sensitized photocatalytic process. The degradation efficiency of these BiOCl nanosheets over RhB is much higher than that over MB or MO, showing high selective photocatalytic activity. The investigation of selective activities of semiconductors is important for better understanding of the mechanism of photocatalytic process, which better direct the exploring of more efficient visible light induced photocatalysts
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