Journal
CRYSTENGCOMM
Volume 14, Issue 13, Pages 4384-4390Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ce25087j
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Funding
- Shanghai Municipal Education Commission [10YZ70, 09ZZ136]
- Shanghai Science and Technology Development Fund [09520500500, 11ZR1426500]
- Key Laboratory of Resource Chemistry of Ministry of Education of China
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Hollow/flower-like BiOI microspheres have been prepared through a facile precipitation route in a water-ethanol mixed solution with the assistance of PVP and citric acid (CA) at low temperature (70 degrees C). The obtained products were characterized by a range of methods such as XRD, FESEM, TEM, UV-vis, DRS, PL and nitrogen sorption. A three-stage growth mechanism of such hierarchical hollow/flower-like microstructures has been proposed by observing the XRD analysis and FESEM of the intermediate products at different reaction times. Interestingly, the structure of BiOI from hollow to flower-like could be obtained by only adjusting the different amounts of reagents in the reaction system. The photocatalytic activities of the hollow/flower-like microspheres were evaluated by the degradation of RhB under visible-light irradiation, compared with the nanoplate sample and P25. Although the hollow BiOI microspheres had a higher specific surface area, the flower-like BiOI microspheres exhibited much higher adsorption and photocatalytic activities than the former. This controllable morphology method and particular properties of BiOI hierarchical microstructures could be used to synthesize bismuth-based semiconductors or other structure-controllable materials and to explore remarkable potential applications of their photocatalytic degradation ability.
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