Journal
OPTICAL MATERIALS
Volume 112, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2020.110781
Keywords
Bi < sub > 4 <; sub > Ti < sub > 3 <; sub > O < sub > 12 <; sub >; Hierarchical microrods; Hierarchical hollow microspheres; Photodegradation; Simulated dye wastewater
Categories
Funding
- National Natural Science Foundation of China [51662027]
- Scientific Research Fund of SiChuan Provincial Science and Technology Department [2020YJ0137]
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This study reports the morphology tailoring of hierarchical Bi4Ti3O12 architectures using tert-butylamine (TB) and oleic acid (OA), revealing the significant influence of TB and OA content on the resulting morphologies. Photodegradation experiments showed that the nanosheet-assembled hierarchical microrods exhibited superior activity in degrading dye wastewater. Interestingly, the photodegradation process of mixed dye solutions differed from that of individual dye solutions, indicating a complex photodegradation mechanism of Bi4Ti3O12 photocatalysts.
Herein we report the morphology tailoring of hierarchical Bi4Ti3O12 architectures by using tert-butylamine (TB) and oleic acid (OA). It is demonstrated that the content of TB and OA has an important effect on the morphologies of as-derived Bi4Ti3O12 samples. When adding 12 mmol TB and 6 mmol OA (with respect to 1 mmol Bi4Ti3O12) to the precursor solution, rod-like hierarchical architectures (length 2-15 mu m, diameter 0.5-1.7 mu m) are obtained. The hierarchical microrods are composed of nanosheets of 20-50 nm in thickness and 300-1700 nm in diameter. The addition of other amounts of TB and OA results in the formation of nanoflake-assembled hierarchical hollow microspheres with size of several micrometres; however the sizes of the microspheres and their sub-nanoflakes depend on the TB/OA amounts. Rhodamine B (RhB), methyl orange (MO) and methylene blue (MB) aqueous solutions, as well as RhB/MO/MB mixture solution (simulated dye wastewater), were used to evaluate the photodegradation performances of the as-prepared Bi4Ti3O12 samples under simulated sunlight irradiation. It is demonstrated that the nanosheet-assembled hierarchical microrods possess a photodegradation activity preponderating over the other morphologies. Moreover, the photocatalytic experiments reveal an interesting photodegradation process of RhB/MO/MB in the mixture solution, which is different from the photodegradation of single dye solution. The photodegradation mechanism of the Bi4Ti3O12 photocatalysts was investigated and discussed.
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