Abstract
Novel triclinic bismuth oxide (ω-Bi2O3) microcrystals with a pyramid-like shape were successfully synthesised by a facile hydrothermal method. The effects of potassium sodium tartrate (KNaC4H4O6·4H2O) concentration and the reaction time on the morphology were investigated, respectively. The experimental results showed that the tartrate (C4H4O6 2–) ions were responsible for the crystal growth of pyramid-like ω-Bi2O3 at the same reaction time. The photocatalytic activity of ω-Bi2O3 pyramids was evaluated by degrading methyl orange under the visible-light irradiation, revealing the ω-Bi2O3 pyramids exhibited outstanding photocatalytic activity due to its suitable bandgap energy.
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